3 500z Amplifier - Lets talk about "used" 3 500z tubes , What to look for!!.

The 3-500Z is rated into VHF spectrum and in any decent RF deck should not drop 50% of it's output on 10. Third, parts are available from MFJ/Ameritron, and if desired most are generic and can be secured from other sources New hams frequently ask, which budget amplifier should they buy for their first HF amplifier. approximately 10 dB of gain (about 10 times amplification). Any 4-1000 GG amplifier schematic can be adapted to the 3-1000Z. The HL-2K operates from 160m through 10 m. I looked inside and saw one tube's filament hardly glowing while the other was brighter than normal. I quickly discovered that one of the two 3-500Z tubes was. The item "Ten Tec Centurion 422 HF Linear Amplifier Amp 3-500Z G TubeS C MY OTHER HAM RADI" is in sale since Friday, November 29, 2019. 9/10 wired for 120v , qsk, soft-key, step-start. With 2x 3-500z Eimacs this amp easily puts out 1KW+. In today’s digital age, social media has become an invaluable tool for individuals and organizations looking to raise funds for various causes. 2 x 3-500Z: More Drake Power Amplifiers Drake L-4B (L 4 B L4B) service manual and specs Drake L-7 (L 7 L7) service manual and specs Drake L-75 (L 75 L75) service manual and specs: CB Equipment: President Midland Uniden. AMERITRON mounts the 572B tubes vertically, not horizontally, to prevent hot tube elements from sagging and shorting out. Nice quiet operation and smooth tuning. My station has a trusty Heathkit SB-220 amplifier for those times when 100W is not quite enough. hot web series in indian Remove the band switch with all . Marconi BH-30 Commercial HF Linear Amplifier 1. Geesh, I wonder how long single 3-500Z amplifiers, graphite or otherwise, will last at such levels " Per my newest 1982 Radio Amateurs Handbook Page 23-11 Table 1: A single 3-500 is good for 850 watts as a class C amp for CW with 3500 volts on the plate, -75 V on the grid and 300 Ma of Ip. For a pair of 3-500Z tubes, normal Ig is about 220 ma. Offering a collection of parts that will convert the 3-500Z socket mounting holes in a Kenwood TL-922 linear amplifier. Details The resource is currently on dxzone. The seller is "jaguar-dog-2008" and is located in Guilford, Connecticut. 6 1/2 INCH CERIMAC PLATE CHOKE HAM AMPLIFIER CB AMP FOR 3CX3000 3'-500Z TUBES. First, the Tube is the reliable 3-500z. I'll probably construct the amp using the 4-400's and after it is running convert to 3-500's. In Stock (more than 10 available). KL0S Shack Note #23 Amplifier Tube Socket Repair. expertelectronics1 (2,814) 100%. It has a pair of Eimac 3-500Z tubes in it. This came out of a Kenwood‘s 922A amplifier the person that purchased The amp had brand new tubes so did not need these was tested at 1200 W PEP output. The result is cooler operation and longer component life. Eimac® 3-500Z Tube Linear Amplifier. Class-C am- 3-500Z x 1 * (external power supply required) …. Thread starter linearone; Start date Jul 23, 2023; linearone King of NY. The only thing preventing full anode voltage from appearing on the cathode of the 3-500Z is the ground on the control grid. Jim W6LG · 11K views ; Things To . run a single 3-500z, 850 watts CW, 1000 watts SSB. The amplifier features fast warm up and 1500 …. Boards work great, all three worked perfectly first try and I've never had a failure. Just a walkthru look see of 2 dual 3-500z legal limit amplifiers. See tables: Table 1, Table 2, Table 3, . – Startup control of filament / filamnet now is in specification of 3-500Z – adjustable quiescent current – Vacuum relay in the antenna circuit – separate power supply 3300V idle. Solid amp with some problems Time Owned: 3 to 6 months. These are from our top quality ISO certified factory in China with our "TubeMan. According to Eimac®, each 3% increase in filament-voltage, above what is needed to. When you open a Henry floor model like this one, no other amps come close to a Henry Floor model. Eimac SK-406 Glass Chimney for 3-500Z Tube Amplifier (excellent, two available) Opens in a new window or tab. 00 (5 offers) - Buy RADIO 3-500Z Tube Ham Amplifier Transmitter National Socket 4-400. There are linear RF amplifiers and class-C RF amplifiers. The vacuum tube acts like a non-linear time-varying resistance in series with a diode. AMERITRON AL-80B Linear Amplifier Single 3-500Z HF 1000 Watts PEP 110 or 220 Volts. (_) Use the multimeter of the amplifier to read PLATE VOLTAGE. Subject: [AMPS] 3-500Z Grid Current Rating. Someone please educate me on this particular box as I have no clue. The stock xformer would only do ~2. It is quiet, makes great power 1300-1400 from the original Eimac 3-500z tubes. The last group of tubes in the 500-600 PEP output vintage amplifiers are 6LQ6. 00 $ Author; Model page created by Martin Bösch. 70% efficiency The AL-80B is built on a rugged steel chassis. Top Rated Seller Top Rated Seller. The 3-500Z triode has taken its place alongside and has possibly even surpassed the 250 TH and the 813 as a workhorse amplifier tube. Hyper Plate Cap 73CNC Cap for 3-500Z $39. All power supply caps ” Read more. SB-220 or SB-221 Heathkit Amp Using Eimac's 3-500Z - K0GKD Category : Radio Equipment/HF Amplifiers/Heathkit SB-220. 572B's have very similar isolation. The 5867 is a triode with a plate dissipation rating of 400 watts. Improved direct drop in for all 3-500Z amplifiers including older Drake, Heathkit, and Henry amplifiers. A purchased amp is normally Grounded grid making it. a continuous reading of grid current and indicates proper operation of the amplifier. A Compact 3-400Z Grounded-Grid Amplifier (one 3-400Z) ARRL Handbook 1968, pp. The tube cabinet houses six Eimac 3-500Z tubes (I think two are 3-500ZG), which are clear and look almost new. The reconditioning of a 3-500Z is relatively simple. These pictures show a 3-500Z at the instant of flashover. SO, the weak link is the power supply. Added a time delay circuit, so when I switch off the amp, the cooling fan runs for an additional 3 minutes 8. Grounded-grid amplifier operation is a bit more complex than grid-driven operation because of the effects that "fed-through" drive power cause in the input circuit. Robust band switching control, easy for it to loaf along with 800w output. Tuned input in the back of amplifier, 200w in=1800-1900*ALL AMP VIDEOS FOR EDUCATIONAL INFORMATIVE PURPOSES ONLY*. Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. The 1978-stamped Eimac 3-500Z tubes were removed and installed in another SB-221 to see whether . Ameritron 3-500Z Replacement Power Tubes are available for all-purpose Amateur Radio service. One states class AB the other states class B. Since most modern transceivers are adjusted for 90W to 110W output, the use of ALC with an amplifier using a pair of 3-500Zs is unnecessary. We offer: New Mobile Line with HG base Line Amplifiers. 99 Silver Plating Solution Amazon Medallion Brand $16. When a single 3-500Z is driven by 100 W, it also splatters. Every LK 400/500 series MF/HF linear amplifier is field tested at its specified. The Henry 2K Calssic X is an export amp in its day. Ameritron HF Power Amplifiers AL-80BXCE. 3V exceeds Eimac®’s maximum filament-voltage rating. amplifier; or with simple cathode bias, it pro-vides good efficiency in Class B and Class C. 3-500Z Amplifier From brochure the by Eimac TYPICAL CATHODE DRIVEN (GROUNDED GRID) AMPLIFIER CIRCUIT FOR TWO 3-500Z TUBES. • B&W PT-2500 Two 3-500Z tubes 10 to 160 meters 1500 + watts out • Drake L4 Two 3-500Z tubes 10-80 meters. The amplifier is based on a single 3-500Z in grounded grid. Glass Chimney Pair for 3-500Z Ham Radio Tube Amplifier (from Henry 3K-A) | eBay. Having built several amplifiers with a pair of 3-500Z's used as modulators in Class B, grid driven and a pair in GG cathode driven, drive requirements are different. We have always liked them for their power and longevity. AL-811HD gives you 800 Watts output in SSB and 600 Watts for continuous duty in CW, RTTY, SSTVand AM operation. Most modern HF/6m transceivers are capable of 100 W PEP at 50 MHz. little bit more drive is needed, like 100+ if available and we have a. Apr 15, 2024 · Part Number: AME-380-0500GT. you are providing a 100 ohm DC path from the 3-500Z cathodes to ground. A good pair of matched 3-500Z tubes with HV around 3600-3800 plate volts and 220-240 Ma grid current, you should get about 1200-1400 RF output into a dummy load/antenna. 500 series Amplifier uses the powerful 3-500Z triode tube …. I was concerned about not needing one. Find Parts and Accessories 3 500zg tubes KEYWORD and get Free Shipping on Most Orders Over $99 at DX Engineering!. Review Summary For : Amp Supply LK-500-Z-all models. Review Summary For : W7RY Amplifier QSK control board ; Reviews: 6 MSRP: 18; An SB-1000 converted to 6m, a homebrew 160m Single 3-500z amp and a Henry 2kd5. The average amplification factor of the popular 3-500Z triode varies with the manufacturer - from 130 (Eimac") to 200 (Amperex). oppenheimer showtimes near showcase cinema de lux farmingdale Eimac SK-406 Glass Chimney for 3-500Z Tube Amplifier (excellent, two. When operated in a cathode-driven circuit, a power gain of as much twenty times is. This was my very first HF amplifier build. Just purchased a matched set of RF Parts 3-500zg tubes for my Kenwood TL-922A amplifier. Because you have 100 watts drive available I wouldn't even consider running the tubes as tetrodes. FILAMENT TRANSFORMER 2 3-500Z TUBE 6 VOLT 30 AMPS CENTER TAPED. Amplifiers; Amplifiers!prices subject to change! All units have tuned input, AB Biasing, SSB delay, HV and Plate Current Metering unless otherwise mentioned. Amplifiers using this type of input will be critical for cable length between the exciter and amplifier. This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. craigslist apartments for rent troy ny Topic: Actual Measurements of FT-1000D or 3-500Z Amplifier IMD Trash Levels (Read 26141 times) 0 Members and 1 Guest are viewing this topic. A One Kilowatt Amplifier Using a 3-500Z. The NEW, RF Parts Company 3-500ZG and Taylor Tubes 3-500ZG tubes are the most rugged tubes of this type available. 3-500zは輸送中に振動で壊れてはいけないので、抜き取って送っていただき、私有のタマでテスト。. Yet another single 3-500z amplifier under test. It does not make to much noise nor does it break the desk down, and runs cool for a glass tube amplifier. All of this ensures that the various electrical. Buy Cary 2pc 5pin Base Ceramic Vacuum Tube Socket Fr 3-500z 4-400 U5g Audio Amp Parts: Tubes - Amazon. This is a updated collection of easy projects for radioamateurs and swl's. Power requirements are 115 VAC 50-60 Hz 30 amps or 230 VAC 50-60 Hz 15 amps. Both have their own unique characteristics,. Although the rated drive is around 55 W, manufacturers of amplifiers with a single 3-500Z give the green light to driving their amplifiers to an anode current of up to 550 mA - a feat that requires using about 100 W of drive. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 3-500z amplifier for sale | eBay. This requires a very hard vacuum. There are also a bunch of mods for them to imporive the amp and make it keyable with a modern radio. Dec 3, 2019 · The Penta Laboratories PL3-500ZG is a high-mu power triode with a maximum plate dissipation rating of 500 watts. TUBE COMPLEMENT - Two 3-500Z or Two 8802/3-500Z or Two 8163 or Two 3-400Z. Superb legal limit HF linear amplifier. So far it received 1 votes for a total score of 9. We show normal operation and MAX output (not recommended). 0/CFM Cubic Feet per Minute air flow per tube to do the cooling job required, thus two tubes would require a total of 26 CFM. hook unblocked Frank Philipse (Wildcat mirror - Jörg Jan Münter) 3-500Z: 3-500Z. Eimac 3-500ZG Graphite Amplifier Amp Tube RARE C MY OTHER HAM RADIO GEAR ON EBAY. Unboxing Kenwood TL-922A, evaluating it for repair and testing the 3-500Z tubes. It's a perfect fit for a single 4-400A, 4-250A or a pair of 4-125As. · A dynamic bias circuit eliminates hundreds of watts of unnecessary heat generation in the power Amplifier tube. Kontes Martin Glass Chimney Pair for 3-500Z Radio Amplifier (from Henry 3K-A) Opens in a new window or tab. 4A ICAS AMPLIFIER Page 3-1 of the Ten-Tec Centurion Manual (Section 3-1,4) is not correct. Each time the amplifier is used, it must be properly tuned using the front-panel controls. Other Parts Accessories For Sale. If you wait and watch you can find a good deal on an ameritron al82 in the ham classifieds, pretty solid amplifier. Some modern solid state exciters have power drop off on some bands so amplifier will put out therefore the f rom the output is a superbly correspondingly less power. Time Owned: more than 12 months. In today’s fast-paced digital world, staying updated with the latest breaking news is more accessible than ever before. A lot cheaper than an AL-82 or AL-80b but then again no filtering whatsoever and a nice glass 3-500z tube. Consider a class AB 3-500Z using a 3000-volt supply. With a modified external supply, providing higher voltage and current it will amaze. Many people, especially on Facebook, say a Watt is a watt is a watt. Grounded Grid Amplifier Power and Efficiency measurements. Amplifier, CE Certified, One 3-500ZG Import Tube, 1,000 W Output PEP, 160-10 meters, 220 Vac, 8 A Max. among others: amplifier, amateur ¬ Lorimor. Aside from their higher cost, they require warmup before use. 95 * Buy It Ameritron's legendary AL-80A kilowatt amplifier has been completely redesigned and extensively improved. For me 35 watts input to 150-ish. Price is for a Single Tube This is a suitable replacement for any 3-500Z (US) tube type. when the amplifier was originally built years ago, 4-400A tubes were readily and inexpensively available. The previous owner had a 25 amp in there. Mine did not have the Heathkit manual available, so I bought the Complete one from Vintage Manuals (www. 2pcs 5Pin 3-500Z 4-400 U5G Base Ceramic Tube Socket For 5Pin 3-500Z 4-400 amp. Actually the 3-500Z is the zero bias tube while the 4-400 being a tetrode likes to see some screen voltage applied. 811a 572b 3-500z vacuum tubes for sale – ctr engineering, inc. This amp makes sense for 6 meter conversion due to low capacitance of just one 3-500Z tube vs two 3-500Z tubes in other amps that only produces 200 more watts output. This means the tube has to withstand several times the maximum dc voltage applied to the stage. It is very well engineered and built. plate and screen voltages that are normally used in amplifier applications. Oct 15, 2011 · 3-500Z Amplifier Schematic and Writeup. Some amplifiers used fixed component values and others are adjustable. 00 V1 Taylor 3-500ZG Tube RF Parts 3-500ZG-TAY $169. Power is 2000W PEP SSB, 1000W DC CW/RTTY input. AL-80B Instruction Manual 1 Features • The AL-80B uses a rugged, inexpensive 3-500Z tube. current for the amount of output power. officials said, confirming an earlier report …. When it comes to maximizing the performance of your CB radio, a linear amplifier can make all the difference. Back to home page Return to top. Comments19 ; Iconic 3-500z/g Tube, Plate Dissipation, Prices of New Amplifiers, Instead Consider a Used Drake L4b. A small bag contains the fuses, fuse caps, and the remainder of the chassis screws wrapped in. been scrapped with the thought that the filament is burned out, when in fact. 3-500Z Electron Tube Triode tube REPLACE 3-500ZG High-Mu Power vacuum tubes 1PCS. Perhaps the question should be, " will three 3-500ZG tubes, connected in parallel, last as long as a . I have a 5 3-500z box that was converted from a heath kit it has a 90 amp filament transformer. The ACOM 1000 HF amplifier is probably the best HF and 6m linear amplifier ever built. Many amplifiers using two 3-500s use such small power supplies they dont deliver …. My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700. Not only does Amtrak offer a convenient and. The seller is "zrcatman" and is located in Colgate, Wisconsin. CLANK HF Linear amplifier with 2 3-500Z; SM5BSZ Building High Power Amplifiers page; How To Run Your (Tube Type - Ed. than with 3-500Z but it does really not matter whether you have 1000. Bought it at the last Dayton / Xenia . Description: Ameritron AL-80a 1KW Output, 160-15, 10 possible with mod. I have a two-piece homemade amp that I bought from an estate sale. It is similar to the Heathkit SB-221, but ads a newer case design. Details Power type and voltage Alternating Current supply (AC) / 120/240 Volt Loudspeaker - - No sound reproduction output. Buyer pays for return shipping. Pat SK 416, same tube, different Part number as 3-500Z. What is far more important to you as an audiophile, however, is that the SA8 is one of the few amplifiers that really has the power to drive virtually any speaker load …. Tuned input circuit [ Home ] [ Up ] I found the problem was in the cable length between the tuned input network and the cathodes of the 3-500Z. ly/2kh7HCHand tap the bell to update the new videos. craigslist pets brainerd mn On Page 6 it says "In ssb mode the zener diode is shorted by S3 lowering distortion". The difference between a 2-ohm speaker and a 4-ohm speaker is the amount of sound each device generates. Topic: 3-500 amplifier is working (Read 14038 times) 0 Members and 1 Guest are viewing this topic. We would like to show you a description here but the site won’t allow us. Related Products; Related Products. com: Cary 2pc 5pin Base Ceramic Vacuum Tube Socket Fr 3-500z 4-400 U5g Audio Amp Parts : Musical Instruments. An amplifier plays a crucial role in enhancing the overall audio exp. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. 資料・見積り・納期をご希望の方は弊社まで お問い合わせ ください。. I forgot to include the circuits underneath the chassis and also wanted to add in the performance of the Eimac 3-400Z triode. With advancements in technology, various ty. Transistors are essential components of modern electronic devices, playing a crucial role in amplifying or switching electrical signals. With amplification, a small current controls a gate for a greater current. modification of an RF amplifier tl922 equip z 2 x 3500 triode by gi46b warning discourage the beginner 3100 v 1A plate threateningFor further information p. Check Details 811a anode w8ji permissible. org Model: Linear Amplifier SB-221 - Heathkit Brand, Heath Co. About a year ago I noticed that as I was tuning it up to chase a DX station it was only putting out about half its normal power. Tuned input circuit of amplifiers and what the tuned input circuit does. variuos methods of biasing power amplifiers. NOS Eimac 3-500z shows up about once a month, Taylor 3-500zg has an instant supply of tubes, of course. expertelectronics1 (2,779) 100%. After replacing the tubes with RF Parts 3-500Z’s (it had arrived with 4-400’s in it), replacing the grid circuitry that someone had inexplicably ripped out, and putting a couple of little brass shoes on the abused. Paul upgraded the amplifier with many of the recommended mods, including new power …. The 811A, 572B, 3-500Z, 4-400, etc. 37 out of 38 reviewers on Eham gave it a 5, a tribute to its excellent …. A single 3CX1500D7 will replace two 3-500Z’s in many applications. The 3CX3000 os a very good choice. It puts out a little less power than it's more powerful sibling the LK-800 (using 3 x 3CX800A7 tubes), however, the amp can not be over driven like the LK-800. The amplifier requires careful operation to ensure its safe use. Screening the holes or use of “wave-guide-beyond-cutoff” (honeycomb) air vents may be required in the VHF. The 3 CX800A7 is useful to 600 MHz. fisher grandpa bear wood stove manual Adjustable (Negative) to - 8VDC. The following is a 3-500Z socket and tube in a Heathkit SB-220 amplifier. The receiving station will never know the difference between the 1kw a pair of 3-500 produce compared to the 700-800 watts the 4-400 will produce. Ameritron`s Dual 3-500Z Amplifier. Stryker Radios SR 955 And Unboxing 3-500Z Tube For Ameritron AL 80B Linear Amplifier. · The AL-80B uses a rugged, inexpensive 3-500Z tube. 37 volts, again about 5% plus or minus. VK2COW 3-500Z amplifier for 14 MHz. This link has been on our site since Sunday Mar 31 2013, and it has been clicked on 655 times. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. 80-10 meters (wish it did have 160). wilton ct patch You get cooler operation because the AL-80Bs exclusive Instantaneous RF Bias completely turns off the 3-500ZG tube between words. I also plugged in an equally nice-looking 3-500Z into my home brew pr of 3-500Z amplifier and a similar fireworks display wiped out the fil/bias transformer (SB-220 part), the bias zener diode, and numerous other components. Fuel your knowledge, unlock secrets, and engage in discussions. AL-80BQ, 1kWOUTPUT, 3-500Z, 100/110/120V, QSK5 PC INSTALLED Save A 26 pound transformer using a high silicone steel core, computer grade capacitors, heavy duty bleeders and ten 3 amp, 1000 V power rectifiers give you a stiff 2700 volts fully loaded. JJ Electronics Amplifier Tube (T-12AX7-S-JJ) 4. Very Good Amp Time Owned: 3 to 6 months. herbalife loaded tea flavors Israeli leaders on Tuesday were debating how best to respond to Iran’s unprecedented weekend airstrike, officials said, weighing a set of options …. However there are still a lot of very good, but older transceivers on 50 MHz that run only 3 -20 W. 3-400Z: The Original grounded grid triode introduced in the early 1960s. 2 x 3-500Z Eimac 1100 W CW/SSTV/RTTY/PSK31 and 1500 W SSB. 3-500Z Infrared Radiation (1/8) > >> KD1SH: Have my chassis and most of the parts for my first big retirement project - a triple 3-500Z amp - and started laying out the sockets, chimneys, tank components, filament transformer; to see what fits where. Fast & Free shipping on many items!. No Items Go Shopping! Toggle navigation. The seller is "hamandhifi" and is located in Sparks, Nevada. That gives the option of running a pair of 4-400A tubes at 1000 watts PEP output, or a pair of 3-500Z/3-500ZG tubes at 1000 to 1500 watts PEP output. Great if you’re using multiple sources and also want FM radio, or if your setup needs even more power than most integrated amps offer. Social media platforms have become powerful tools for sharin. This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. FOR SALE RF Parts 3-500ZG Tube SOLD Pending Payment. LOT 2 SOCKETS 3-500Z ON PLATE HAM AMPLIFIER HAM BUILDER. Inexpensive tubes: the AL82 uses a pair of rugged 3- luminated panel meters. this test works on 99% of all 3-500z amps. L4TNM-PSA CommScope® / Andrew Type N Male Positive Stop™ for 1/2" AL4RPV-50, LDF4-50A, HL4RPV50 Cable. Hits: 4780 | Votes: 7 | Rating: 7. An old ARRL handbook will show how this is done (See the 3-1000Z amplifier metering in the 1963 Handbook, page 207, for instance). The amplifier has a wide line voltage operating range. GI-46b or GI-23b tube socket Kenwood TL-922 & Heathkit SB-220 3-500Z KK4NOZ. Power Grid Tubes (4656) 100% positive; Seller's other items Seller's other items; Contact seller; 3-500Z / 8802. The following describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. Otherwise you'd need to bias the grid positive which posses it's own problems including high grid current. The series provides the amateur operator with a choice of power output levels and features consistent with their specific operating requirements. Completely refurbished the old Heathkit SB-1000, and put the new tube in replacing the Eimac 3-500Z after 25 years. 500z amplifier singleImproved anode parasitic suppression for modern amplifier tubes Measuring bias 3-500z3-500z amplifier project. 3-500z amplifier project500z amp index 3-500z/50mhz drawingGs-35b tube amp. Using Tuners in Radios, or External Tuners, for Matching. Comments9 · 2 tube 3-500z Amplifier Mountain Top Electronics · 10 KW Amplifier On CB Radio Goes Bad. Amp Supply LK-550 (3 x 3-500Z) 7: 2023-03-24: 1899. The amplifier is rated for 700 to 800 watts output, when driven with about 80 watts. (I just repaired one for a fellow amateur. The 4-400 will have less power output,,the 3-500Z is a higher gain tube. So I'm about to fire up my LK550 with 3 eimac 3-500z's. IIRC, the 3-500Z tube can be fed with up to 4k volts and put out 'mo powa'. Have used for 20 years but need to downsize. All of these glass tubes are made by one of two low end Chinese manufacturers and are simply rebranded to the distributors name. 37 out of 38 reviewers on Eham gave it a 5, a tribute to its excellent overall design. raytrack 2000 dual 3-500z linear amplifier converted to a single 500z for tube testing. Contributing Member Offline Posts: 8893 "Let's go kayaking, Tommy!" - Yaz. The peak at 4 is from the same effect noticed in the 3-500Z trace. The seller is "46taildragger" and is located in Dallas, Texas. The Amplifier was tuned up and tested working when listed. Learn How to Fix the Astron Power Supply Meter. I acquired my Centurion from an SK's estate in July, 2016, so my comments are directed to the amplifier with 25 years under its belt. The 3-500Z tube in my opinion is: very durable, will tolerate abuse (miss-tuning), relatively available and easy to obtain, instance-on, a pair provides full-legal-limit RF output and best of all, has the best "Power-To-Dollar" value ratio. Amateurs with these lower power radios will find this amplifier an excellent addition to the shack!. When you need to see a cellular tower location map to find your nearest cell tower, there are a few options, as shown by Wilson Amplifiers. I ALSO HAD NEW TUBES 3-500Z INSTALLED JUST IN CASE THE OLD TUBES HAD ISSUES, HAVE ORIGINAL BOX AS WELL, PRICE IS $1,600. Up Close 3/31/24: MTA approves congestion pricing. It tunes up with the tune knob mostly open and the load closed 3/4 or better. LK-500NT No Tune-Up Ham Radio Amplifier with 2x Eimac 3-500Z Tubes" is in sale since Tuesday, October 03, 2017. Reactions: 9C1Driver, 1iwilly and Shadetree Mechanic. Vacuum tubes, how they convert d-c …. Inexpensive tubes: the AL82 uses a pair of rugged 3-500z tubes. With 500 watts of plate dissipation per tube and a large cooling fan, the amplifier is conservatively rated. The second, it's easily repairable when something does happen. The tubes seem to be real rugged, and dont warm up like the old Eimac 3-500z's. Tl kenwood 922 922a modifications diode schemas power circuits pa0fri xs4all lineairs nlQsc amplifier audio sch manual service schematics pdf 1st preview elektrotanya Kopykat 3-500z amplifier performance reportBias amplifier cathode fig nearly perfect adjustable. Both tubes were excellent in mechanical and emission condition. The amplifier is quite simple; the drain supply is 12 V and the quiescent drain current is 100 mA, which is obtained with a gate bias around 3. The normal peak anode voltage, in a typical class AB amplifier, is nearly twice the dc anode voltage. If you are looking for a vintage 3-500Z amplifier, this is a good choice. When the amplifier was keyed with >30 watts RF drive, the Ig grid meter pegged full scale. 5KV GRID DC bias voltage: —75V Anode DC Current: 300mA A---A 3-500Z is a direct thermal carbonization thorium—tungsten cathode, glass triode, the anode cooling method is natural cooling, the maximum anode power dissipation is 500W, the maximum operating frequency is 110MHz, the output power is 850W. Find Amplifier Replacement Parts and get Free Shipping on Most Orders Over $99 at DX Engineering! Get Tech Talks, Interviews, Product Features, Interviews & More at Our YouTube Channel Ameritron 3-500Z Replacement Power Tubes 380-0500GT Tube, Replacement For Power Amplifier, 3-500ZG, Graphite, Each. A TS690 puts out 50 W and is an excellent 6m radio. The filament-voltage is typically 5. > >The CB crowd run 4, 6 and even more 3-500Z's on 27MHz !!!!! Apparentl;y, at least some of the CB crowd knows about hamdom's old wives' tale of not being able to tune a multi-tube amplifier at the high end of HF. It probably dates from the mid to late 1980's. Find Amplifier Replacement Parts 3-500z KEYWORD and get Free Shipping on Most Orders Over $99 at DX Engineering! Amp up Your Operation with the DX Engineering Super Card – Apply Now! Tube, Replacement For Power Amplifier, 3-500ZG, Graphite, Each. The anode is forced-air cooled for 800 watts of cause amplifier instability or regeneration in the VHF re-gion. Ham Rf Tube Linear Amplifier Repair. A max of 100 W input drive power is required. Are you a senior looking to explore the beauty of America? Look no further than Amtrak, the nation’s premier passenger railroad service. Learn How to Build a 1/2 Wave 75 Meter Wire Antenna that. 2PCS 5pin U5G Ceramic Tube Socket For 4-400A 3-500Z 4-400 4-125 AUDIO AMP DIY. tubes with a pair of 4-400A tubes in a Heath SB 220 amp. The final tubes are a pair of Eimac 3-500Z glass triodes specifically de-signed for improved grounded-grid linear op-eration. 2 KW PEP Linear Amplifier based on pair Eimac® 3-500Z. Products tagged “3-500Z” This 3-500ZG replacement tube is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. Post subject: 3-500Z single ended amplifier anyone? Posted: 21 Jan 2009 3:04 am. Created Date: 9/14/1998 2:12:32 PM. Transistors are inverting amplifiers, so two stages of amplification in the same box really does invite oscillations, especially with the stage gains we see on 'CB'. 190 KHz QSO in QRSS-3 - Happy New Year 2016. Didn’t care about SSB as in my opinion it’s a marginal add-on to appease the masses. Its a Henry Amp !!! Time Owned: 0 to 3 months. com), including all schematics and. This amp features a temperature controlled, two speed fan. SWAN MARK II TWO 3-500Z LEGAL LIMIT AMPLIFIER For SaleSwan Mark II Pair 3-500Z Amplifier UNIT BACK ON THE MARKET PRICE REDUCED ----- RF Deck No tubes Needs plate parasitic chokes 2 No cover has bottom plate All else is there. roughly approximate those of the Eimac 3-500Z. Vacuum Tubes how they work in RF power amplifiers and why vacuum tubes arc in amplifiers Includes details on 3-500Z and 8877 3CX1500 A7 tubes. A single 3-500z would put you around 150 carrier and 750 pep, two tubes would be nice. ) Linear (975,720 bytes, PDF file) QST November 1962, pp. See all of my projects at OLDER POSTS down on this blog. This is true even when the amplifier does not have a directly grounded grid. 3-500ZG Three Matched Vacuum Tubes, High-Mu Power Triode, 500W, Ceramic Base, Set of 3. The book says it covers warc bands so it will do 12m. Designed as a swtich, so unlikly to work as a linear amplifier. INSTALLATION Transformer Installation Remove the cover of the amplifier. Review Summary For : Swan MK II. causing the filament to go out. Learn reasons tubes fail in amps. Each LK 400/500 series amplifier uses the powerful 3-500Z triode tube(s) in a grounded grid configuration Class AB2. LMR400 Times Microwave Flexible Low-loss Coaxial Cable 3/8 in. If you’re an avid CB radio user, you understand the importance of having a reliable communication range. Vintage Heathkit SB-221 2kw linear tube amplifier for HAM radio with 3-500Z 3-500Z tubes. , 1213 Estes Avenue, Elk Grove Village. The resource is currently on dxzone. Find many great new & used options and get the best deals for EIMAC 3-500Z AMPLIFIER TUBE IN BOX WITH WARRANTY CARD AND ORIGINAL PACKING. Carbon resistors, on the other hand, are damaged by small thermal overloads over long periods of time, because damage accumulates over time as the base material changes. The peak at marker 4 is a test fixture artifact. Up for your consideration is a Heathkit SB-200 HF linear amplifier. transformer using a high silicone steel core, computer-grade capacitors, heavy duty bleeders, and ten 3 amp, 1,000 V power rectifiers give you a. However, NOS is commonly available at $20-$25 per tube. And a 3-500Z is a zero bias tube which requires 3000 volts to draw enough plate current to be useful. No longer in manufacturing production. business interest AND "Atish Banerjea" sigpatches github grounded grid triode introduced in the early 1960s. 3-500Z & 4-400A: The following is a list of clips and their matching tubes. This newly revised version has had a. w5wp-tx (1273) 100% positive; Seller's other items Seller's other items; Contact seller; US $40. DB2MJ This amplifier is in use during high power contest SO2R operation with my Icom 756 Pro III as the run side of the shack. I have 3 eimac 3-500zs in this and it. 4 FEATURES BAND COVERAGE 10M, 15M, 20M, 40M, 80M, 3—500Z Zero Bias Triodes Forced Air Chimney Cooling (Continuous Duty Squirrel Cage Blower) Adjustable, (Negative) Interlock for Imput AC …. VINTANGE LOAD CAPACITOR FOR 2 TUBE 3-500Z 31-145S AMPLIFIER HAM RADIO. Personally I prefer Henry RF Amplifiers with 3-500Z type tubes. The blower is noisy could stand to be bigger. Their plate voltage is too low and the tube is not cooled properly. blackcat jb-76 driving a dual 3-500z amp, yokogawa tokyo high power thp medical amp; 17:34. 3-500ZG, 3-500Z RF Parts Transmit Tube One Year Warranty Matched Quad (4) $999. I consider a 3-500Z tube good when the anode holds off at least 8kV in a static leakage test. 0/5 MSRP: $ (missing—add MSRP) Description: Legal limit no tune version uses 2 3-500z tubes. The Machlett 3-500ZG is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio …. Henry Radio 2KD-5 Linear Amplifier. GS35b tube chimney and fan system SB220 3-500Z 3CX1500 8877 tube amp KK4NOZ. With its powerful 2 3-500Z tubes, it's capable of transmitting UHF, VHF, FM, and AM signals with ease. ElPaso TubeAmps · 18K views ; Heathkit SB 220 Linear Amplifier refurbishment. If the vacuum is okay, there won't be any leakage current through the tube when it's cold and out of the amplifier. I decided to pair the original Eimac 3-500Z with a new Chinese 3-500Z from RF-Parts. AMERITRON AL 82 AMPLIFIER HAM 2 3-500Z TUBES FREE PICK UP. The linear amplifier has an efficiency of between 50% and 60% but am-plifies the input signal accurately. Eimac, 3-500Z HIGH MU POWER TRIODE. The main power transforner is a Peter dahl brand and it weighs 67 pounds. Get the best deals for 3-500z amplifier at eBay. This package contains the chimneys for the AL-82. The E[MAC 3-500Z is a compact power triode intended to be used as a zero-bias Class-AB2 amplifier in audio or radio-frequency applications. ZS1ZC Rating: 2021-03-22; Heavy Lifter for QRO Time Owned: more than 12 months. Desk top 3 tube 500z,4500 watts peak output normal operation5500 watts absolute max output1500-2100 watts bird average220v. Eiinac 3—500Z tubes will give adequate drive from the exciter. FRONT PANEL CONTROLS ON-OFF - Rocker Switch SSB—CW/TUNE — Rocker switch changes plate voltage for different modes of oper-. As a ham operator, and an amplifier that uses this tube in its final, it's just what the radio shack ordered!! Dennis K6KRV. I have been studying the Service Manual for my TL922 in connection with the bias arrangements. PRICE FOR BOTH:$299, for pick-up at Greer, SC or plus $26. Includes tube data and amplifier projects. No shortcuts taken, very reliable amplifiers based on rugged tubes like the 3-500Z. Learn How - Winding your own Inductor RF Choke. Get the best deals for eimac 3-500z tube at eBay. Tutorials and other information on designing and building hf amplifiers. A few tubes of moderate instability are 3-500Z, 3-1000Z, and 4-400A's. No Paypal for me ever again, and if you are. They provide less gain in gg operation vs a pair of 3-500z. Henry Radio manufactured high power tube amplifiers for Amateur Radio, business, commercial, industrial and scientific use for nearly 50 years, but that part of our business closed in 2005. "powered "but" the grate" lol omg i did not see this till the video was done wow. One of the most widely used platforms. It is intended for use as a zero-bias Class AB amplifier in radio-frequency or. One 3-500Z tube is more efficient on 6 meters. same thing on 572/B 811A 3cx1500A7 etc. No Interest if paid in full in 6 mo on $99+ with PayPal Credit*. Data for the 8938 are the same as for the 8877 but the coaxial base is more suited for VHF/UHF operation. (M Swedgal, 258 Broadway, N Y 10007) Click HERE to read the data-sheet of the Eimac 3-500Z tube. Operation with zero grid bias …. Kontes Martin Glass Chimney Pair for 3-500Z Radio Amplifier (from Henry 3K-A) $95. KA5ROW Rating: 2017-10-21; For me Great Tube Time Owned: more than 12 months. expertelectronics1 (2,822) 100% Buy It Now. In addition, grounded-grid operation is attractive since a power gain. Both links you have are to a standard 3-500Z. appearing on the cathode of the 3-500Z is the ground on the control grid. Manufacturer: Palomar: Model: 300-A: Description: Bi-Linear Amplifier: Type: Operator Manual +schematic: Price: $4. The item “Drake L4B Vintage 3-500Z Tube Ham Radio Amplifier + Manual (please read) SN 6115″ is in sale since Wednesday, February 12, 2020. This item can be shipped to United …. A 3-500ZG is simply a 3-500Z on steroids. A pulse rated version (3CPX800A7) is also available. 3-500Z Amplifier Schematic and Writeup. 1/2 inch diameter (Permag Central Corp. QSK modification for a 3-500Z Vacuum Tube RF Amplifier. UNTESTED FOR ITS INTENDED PURPOSE AND SOLD AS DISPLAY ITEM. METAL STUD MOUNTED 300 AMP 400 PRV ECG NTE 6354 IN3737 RECTIFIER DIODE NOS (#234105425108) See all feedback. Eimac even owned a commercial broadcast station! KSBR was licensed to Eitel McCullough in 1947. Got the Ameritron AL-82 with 2 3-500z tubes. 203-892-4119: Take a look: The current production glass envelope 3-500z and 572b tubes supplied to me have been of the best quality compared to other sources. 6LQ6s have been out of production since for many years. BUT, personally I wouldn't increase the power from 600 to 800W on a HF amp, for 3 …. The Kenwood TL922 amplifier running a pair of 3-500Z triodes in grounded grid configuration is one of the best pieces of equipment specifically engineered for radio amateurs. Increased subscribers not only boost your channel’s credibili. Ameritron`s Dual 3-500Z Amplifier The Ameritron AL-82 Linear Amplifier is designed to give you years of trouble free service at the full legal output power limit. This power source supplies the energy for the RF output power. Yet another 2 tuber 3-500z looking for its new home. The amp stands about 32 inches high, weighs close to 180 lbs, and every part is heavy duty. Αναρτήθηκε από Tom Nikas, SV1BFW στις G0MRF 476. The rectifier board in the power supply has been replaced with an updated Harbach board and caps. the tokyo hy-power hl 1 2kfx sold; 15:53. 3-500ZG Penta Laboratories High Mu Power Triode Matched Quad (4) Tubes 3-500Z. High-quality power supply and RF components combine with an accurate peak-detecting directional coupler, front panel adjustable true ALC circuit, and automatic bias switching to make this the best featured and most reliable single 3-500Z amplifier available. This was a spare tube for an amp I sold about 2 years ago. The 3-500 tube style amplifiers are still offered by many amplifier manufacturers to satisfy the undying demand of those afflicted with OCTD, known in the medical community as Obsessive-Compulsive Tube Disorder. Find many great new & used options and get the best deals for EIMAC 3-500Z HAM RADIO AMPLIFIER TRANSMITTING TUBES ( 2 ) at the best online prices at eBay! Free shipping for many products!. Tubes are properly cooled to better the max spec of 392 degrees F or 200 degrees C for the new tubes. sku: 781607863036103 Review (MPN # 3-500Z for sale) RADIO 4-400 Tube Ham Vintage Amplifier Transmitter Sockets National. (If you have tried recently to find those 10W zeners, you know they are hard to find and expensive). 160mでのスプラッタの原因は高圧電源へキャリアの漏れでした。. Linear Amplifier Single 3-500Z HF 1000 Watts PEP 110 or 220 Volts. Description: Runs a pair of 3-500Z tubes, Legal Limit output, built like a tank! Covers 160-10 meters. Originally $675, now $625 ($50 price drop) $675. Performance wise I can’t complain for $530 shipped. The 3-500z tube is recomended for use in zero bias amplifiers and is a very popular choice in Amateur "Ham" Radio applications. when not transmitting in order to reduce the idle currents in the 3-500Z. The unit is a completely self-contained table top unit capable of 1000 watts input. Slightly larger body requires minor changes to fit where 3-400Zs were used. Henry RF amplifiers maybe big (34" tall), heavy (150+ #s) and old (1960-1990s), however high power RF amplifier technology has not changed much over the years. DENTRON RADIO MLA 2500 LINEAR AMPLIFIER FILAMENT CHOKE 4 572B 811 3-500Z TUBES. Removed the carbon comp resistor in the plate circuit, installed a flame proof 5 watt, wound with a new. Next amplifier Last modified 2022-10-06 Drake L-4B SPECIFICATIONS. Newly designed ceramic base provides better temperature control for longer life. Save up to 15% when you buy more. You *must* login first, using the 'Login' link at the top of this page. Penta Labs RF Vacuum Tubes 3-500ZG-2 PLB-3-500ZG-2. That tube amp should be able to load into anything with an SWR of less than about 5 or 6 to 1 without any loss of power. 3-500Z tubes are the tubes we usually use in our own Ham Radio Amplifiers. CPI Eimac, 中国製などの電子管・送信管を取り扱っております。. The article claims a 3-500Z filament is rated at 4. The key-down current with a 3-500Z was 420 mA and standing current of 70 mA, resulting in a RF output of 430 W. If you’re a music enthusiast or someone who appreciates high-quality audio, having a superior sound experience is essential. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive. If you are in need of a powerful and reliable megaphone, Technical Pro offers a range of options to suit your needs. best fairy costumes RFC3 15’ of #24 Thermaleze wire Amidon AWG#24 HAPT $3. Built like a brick s&%$house!, Two Piece unit, internal blower, vacuum cap on tune, all over sized components, chimneys, high efficiency plate caps, variable. The power output is rated at 1300 watts on ssb, 1000 watts cw and 650 watts using “key- down” modes. wiccan symbols and meanings list The tubes will be laid out in a triangle, with the plate choke in the center. Excellent working condition less tubes. Operation with zero grid bias simplifies associated circuitry by eliminating …. Interesting that the Chinese 3-500Z lasts over 10 years and still performing well in amplifiers. The SS-2000 Amplifier (one 3-1000Z) (1,477,098 bytes, PDF file) ARRL Handbook 1972, pp. It has been a wonderful amplifier so far and tunes up nicely. 3-500Z is rated at about 500 watts. Notify me when this item is in stock. Genuine Penta Laboratories tubes. I've an acquaintance interested in purchasing a Texas Star. Tube 3-500Z or Röhre 3-500Z ID6384, Transmitting Triode, air cooled, SPECIAL TUBEBASE in general and Power/Output shown. The tube sub-chassis allows a direct connection to the blower for max air and efficiency. It will work 160 meters through 10 meters and output power is slightly over 1000 watts. The TL-922A is a Class AB2, grounded grid linear. •Replacement 3-500Z tubes = $250 each. Alternator External Voltage Regulators. Repeatedly the Ameritron manual warns. I'm referring to amplifier tubes. The item "Ten-Tec 422B Centurion Ham Radio 3-500Z Tube Amplifier with Manual (works great)" is in sale since Monday, May 24, 2021. I am not enthusiastic about the 4-125A, 4-250A and 4-400A, with the gain on 10–20 metres falling below the European tetrodes. If you hear arcing across the air variables, this means the amplifier is out of resonance. The SB-220 was a copy or clone of the Kenwood TL-922, and I have one of those. shipping included an insured tracking number provided at time of shipping $800 local pickup available 100mi of 61252. formance Eimac 3-500Z power tubes. The amp was built by Paul Gallier (WQ1C, now SK) in 1972. Jim Heath W6LG shows how he tunes a linear amplifier for maximum output power in watts. Use wide anode circuit leads from the tube to the tuning capacitor. The amplifier and supply each occupy just over 1 cubic foot and are made from readily available components. I have a Excellent working full output Ameritron AL80A 3-500Z base linear amp. Since this Raytrack 2000 I got many moons . The 4-1000A is a tetrode with a 1KW plate dissipation rating. A Compact 3-500Z Linear Amplifier. Thank you for watching our Tune up reports. According to Eimac®, each 3% increase in filament-voltage, above what is needed to achieve full power. RF deck and power supply final tested with Eimac 3-500Z's at factory and ready to go. The 3-500Z tube is available from RF parts. These heavy-duty, graphite-plate 3-500Zs are an updated version of the venerable vacuum tube that has been around for well over half a century. 6kv (a 'Peter Dahl' xformer) and ~1. I am in the final throes of converting a Drake L75 (single 3-500Z) amplifier to 6m. Operationally, the Ameritron AL-82 and even the AL-80b are similar to the great Drake L-4B I once owned, and other tube amps I have operated. Anode power dissipation of 400 watts. QST's October 2011 " The Care and Feeding of a 3-500ZG Amplifier "article comment link. However, this one has been modded to 3 3-500z's. Pruett) Date: Tue, 4 May 1999 13:40:18 -0400. Find Amplifier Replacement Parts 3-500z KEYWORD and get Free Shipping on Most Orders Over $99 at DX Engineering!. The pictures here I'm going to post are of the John Boy Tube Amp for the Mobile it says and has 3CX3000 Mobile tube Amp for $4500. The input and output circuit of a grounded grid amplifier are connected in series through the tube. Others, using potentially damaging. vanced high-power technology using two high-per-. This is simply the BEST single 3-500Z amp out there, bar none. Are you looking to enhance the sound quality of your audio setup? A Nikko preamp might be just what you need. The last 100 watts isn't making the difference, nobody can notice the difference beteen 800 …. Kenwood TL-922A HF linear amp is designed to provide the maximum legal power, utilizing two 3-500Z. Freight - Check the item description or Contact the seller for details. The item "HEATHKIT SB-220 3-500Z LINEAR AMPLIFIER WITH EIMAC TUBES REALLY NICE" is in sale since Tuesday, July 21, 2020. If you want a decent box, get a single 1200A7 box. When the tube is conducting, the pulse is off. The Taylor is reported to last 5 to 10 years per hams. I have a commercial 3-1000Z amplifier I just put a 4-1000Z tube in, works fb, but drive went up! The 3-1000Z is like an 8877 / 3CX1500. A kilowatt amp with two 3-500Z tubes and resonably priced on the used market. tokyo hy power hl 450b for sale; 12:13. ly/2kh7HCH and tap the bell to update the new videos. Everything was laid out well and rated with enough …. The Machlett 3-500ZG is intended for use as a zero-bias Class AB2 amplifier in radio-frequency or audio frequency applications. 3-500Z is especially good at this, in a matter of seconds. This item is in the category “Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers”. Now, at a price well over a hundred bucks. History timeline811a tube 572b tube history 811a tube 572b tube history – w8ji website811a 572b w8ji. The transformer in each amplifier has HV winding taps that provide 1/3, 2/3, and full voltage. The seller is “hamandhifi” and is located in Sparks, Nevada. 95 * Buy It Ameritron's legendary AL-80A kilowatt amplifier has been completely redesigned and …. Both have same date code and are only two numbers apart in serial number. This amp employs a pair of the Eimac 3-500Z triodes. Ameritron AL-80B amplifiers use a genuine 3-500ZG tube--not the cheaper, less reliable 3-500 tubes used by some competitors. Then let the amplifier cool off for 2-3. Eimac SK-406 Glass Chimney for 3-500Z Tube Amplifier (excellent, two available) $100. Drive power is 80 or more watts. GS-35B Russian Tube HF Amplifier. Thank you for viewing my youtube channel. As fitted to many popular Linear Amplifiers such as Linear Amp UK, Trio/Kenwood TL922, Ten-Tec, Drake, Heathkit etc. john deere gator 825i gear shift lever replacement This amp is in very nice shape. unit_399 said: Contex 500 Plus is my favorite. They fail as a short circuit, most of the time. SPARES FOR MY SB-221 WHICH I SOLD. I believe the owners original 3-400z was a new tube. Part Number: 3-500ZG & 3-500Z. 1x One Eimac 3-500Z Vacuum TUBE - For DISPLAY ONLY *~~STEAMPUNK~~* PROJE. 120 volt" is in sale since Wednesday, April 25, 2018. The power dissipation is 400 Watts. This link has been on our site since Monday Mar 16 2009, and it has been clicked on 4309 times. This is, without any question, false. Changing that cable from 52 ohms to 18 ohms increased efficiency from 30% to 60% on ten meters, and improved IM3 from -31.