Drake l4b amplifier. Drake L-4B Amplifier Solid State Relay Modification. I did replace the original 3-500Z's with 3-500ZG's (graphite) tubes and got an extra 100 watts or so out. $750 plus shipping in 3 boxes. Click here to read Gene's Article. The large 8 pin connector on back of the L4B chassis, originally connected to the L4PS power supply is now the primary power connector for the new design. Amateur Amplifiers. "Export Model" Drake L4B Right hand view. Little Hidden Treasures LLC (3248) 99. Also included in the sale is a reproduction of the manual. The Drake L4B Amplifier was designed and built in the middle 1960's as a two piece unit. 00 – $ 125. Feb 11, 2024 · 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: Bias supply has been updated so PS is now cooler and safety fuse installed. External power supply keeps that extra heat out of the chassis. or Best Offer Nov 4, 2023 · Drake L-4B AmplifierMi sc Spare Parts. This was a custom switch that has been out of production Sep 17, 2023 · Drake L4B repair, mod and operation. This kit comes with the custom plate to replace the 2 pin VOX plug, and mount an RCA connector which is commonly used with amplifiers. 00 or more on eBay. Mar 9, 2024 · I have a very nice Drake L4B HF amplifier I would like to offer for sale. Louisville, KY. c. Pulled and checked, only reading 1. 5 seconds after power-on. Tubes must be of equal type. Drake L4B / L7 Amplifier Parts Lot . cover to confirm. original, Drake L4B amplifier and OEM power supply. This is fine American craftsmanship. or Best Offer Amateur Amplifiers. Feb 21, 2012. 38 inches in diameter and 2. I'm Drake L-4B Amplifier Solid State Relay Modification. Save your money on this "soft start" board. It has the original Eimac 3-500z tubes and still does 1200-1300w out when driven with a 100w transmitter. $434. The document is scanned using 100 dots per inch which ES4L-4B SOFT-START/SOFT-KEY/BIAS MODULE INSTALLATION INSTRUCTIONS. . 8Khz SSB Filter For the TR-7(A) Drake TR-7 Front Panel Transmit Power Control Replacement Power Switch For The L4B Amp Unraveling the Drake TR4 SSB Filter Scheme Drake L-4B, Table Top Amplifier redesign Aug 16, 2020 · That turned out to be the case. 32 MB Nov 1, 2022 · Jim Heath W6LG shows how he tunes a linear amplifier for maximum output power in watts. The Drake L-4B has 1000 watts PEP power input on AM, CW and RTTY and 2000 watts input on SSB. "Export Model" Drake L4B Tube view. Oct 3, 2022 · The 3-500z and 3-500zg are iconic tubes. You say you got the manual with the amplifier, right? That's the only one; there's no "user's manual". 1,500 watts PEP output, 100 watts input, loafing. The build was done by Jelmer PA5R. A Homebrew AUX-7 Board for the Drake TR7 and R7, by Floyd Sense / K8AC. is made to Replace the 2 Pin Keying Line Socket so you can easily interface to your modern or vintage transceiver to the Drake L-4 or L-4B Linear Amplifier. My L4B was acquired from a SK estate. The amp is in mint condition. Non-smoker owned. Here is an article by Gene McCalmont, W5DDW, on a replacement blower fan for the Drake Amplifier. The RF deck appears outwardly OEM Drake with all. The specs state that it draws up to 17. I'm Drake 4-Line Internal Digital Frequency Display Drake Parts, Materials and Resources Adding a Panadapter ALC Control Box INRAD 2. MODEL MANUAL LINEAR AMPLIFIER. Mar 14, 2018 · Drake L4B power supply Harbach Electronics kit installation. comThank you for watching! Don't forget to like Apr 7, 2021 · Drake MC-4 Mobile Console – General Description. Was Drake L4B manual. High Speed Switching For The L-4B Amplifier, by Garry Drummond / K4OR. 2 lb = 1 kg) 14. This was a custom switch that has been out of production An Amplifier Builder’s Mindset Drake L4B/8877 RF Deck Overview A view of the 8877 tube placement and the high volume squirrel cage blower. Front face is excellent and only few marks on outer cabinet. This all-in-one board limits inrush current during amplifier start-up by placing a small resistive load in series with the AC mains. 7 watching. Drakes idea of zero bias and 220-230 ma of idle is fubar, poor engineering. Pictures: Drake TR-4C The tubes are 4CX1500Bs in grounded grid (!). He gest about 1200 watts from a Drake L4b Linear Amplifier from the 1 Get the best deals for drake l-4b at eBay. 5 kg / 31 lb 15 oz (31. #14 · Jun 12, 2007. #1. The Drake L-4B is one of the highest quality amateur amplifiers ever made, a time-tested design, ruggedly constructed, with top notch components. Parts & Upgrade Kits for R. This amplifier gives a nice 1 kW output from 80m up to 10m. migsradio (1,918) 100%. The load resistor is switched out of the circuit by a relay approximately 2. The best solution for us was to sacrifice the 80m position, and modify it for 160m. Used for contesting and DXing. 95. Air blowing up through the tube sockets keeps everything cooler so tubes AND sockets will last longer. The IC-7300 will interface with any QSK Amp which may be keyed with Single-Line keying, and uses 12 volts d. From (e-Mail): Jul 19, 2008 · I am the proud owner of a mint condition orphan Drake L4B Linear Amplifier that is in need of a power supply and cable. Drake Ham & Amateur Aug 21, 2011 · This Drake has the big oversized transformer. but the on-board watt meter shows. All frequencies 3. This was a custom switch that has been out of production The Drake L4B Amplifier was designed and built in the middle 1960's as a two piece unit. Drake Model L-4B Linear Amplifier. The first thing I did was do a full Harbach upgrade to the power Drake L-4 & L-4B RCA Adapter to Replace the 2 Pin Keying Line Socket. 3CX1500A7/8877. US $59. Final amp tubes are 3-500Zs. U729 Drake L-4B $ 679. Visit us to buy, sell and see more: Amprepairguy. amplifier with 2 3-500zs Im. Seller does not accept returns. Nov 21, 2020 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The R L DRAKE Model L-4B Linear Amplifier offers continuous 2000 watts PEP­ ssa, and 1000 watt DC. trustworthy external watt meter. P out SSB 2000 W PEP, CW, RTTY, AM 1000 W. List-post: < mailto:amps@contesting. RF Input & Output are 50 OHM Coax. In the L4B redesign I found the open area between the final tube and the plate tuning capacitor was the best location for the fan. See terms and apply now. eBay item number: 276403479606. Those replacement switches from a parts amplifier sell upwards of $125. Today you can find the L4B amplifier without the L4PS power supply from several sources, such as hamfests and through the e-Bay auctions. So no ALC connection. The beauty of an L4B is the separate supply which makes working on the deck safer by having it separate from the HVPS. The connector, depending on how the amplifier is jumpered internally, will except either a 110VAC / 220VAC input. Article: The Drake TR4 Transceiver Refurbishing Project . or Best Offer +$14. YouTube 1 day ago · Drake L-75 (L 75 L75) PDF User Manual for Drake L-75 (L 75 L75) : More Drake Power Amplifiers Drake L-4B (L 4 B L4B) service manual and specs Drake L-7 (L 7 L7 A Drake TR4C full output transceiver (no blanker) w/ 3/16" new. Found a bunch of oil so replaced it. Drake L4b. Mar 29, 2022 · SOLD! FOR SALE: DRAKE L-4B LINEAR AMPLIFIER. com >. I've got this beautiful Drake L-4B linear amp for sale. IE: xcvr is dirtier than the GG amp. With original Owner's Manual and other papers. Sep 26, 2017 · Drake L4B Vintage 3-500Z Tube Ham Radio Amplifier + Manual (please read) SN 6115 This is a nice amplifier. Super quiet fan. 00 Economy Shipping. Drake L4B / L7 Amplifier Parts Lot. The newly WB4HFN Home Page Drake Techni. Drake Amplifier Repair - L4, L4B, L7, L75. Free shipping. Be loud! Two new Amperex 3-500Z tubes. littlehiddentreasuresllc (3,357) 99. There is not much you can do with an L4B Amplifier without the power supply, so what are your options. C $82. sc Spare Parts. That can trip a 20 amp circuit if anything else is on the circuit. This thing is built like a tank. 110/115vac) c. Until recently there was no known replacement blower fan for the L4 and L4B amplifier. Welcome to Amprepairguy. Be prepared and able to communicate in case of emergency with the largest selection at eBay. I am now retired and living on the Isle of Man, my background is as varied as it gets, ranging from Information Technology to Graphic Designer and 3D VFX Artist, using and teaching Autodesk Maya, Softimage, and Smoke, one of more enjoyable positions. It is designed around and features new modern 220 μF 450VDC electrolytic capcitors, 1000 PIV 3A diodes, new 100K 3W bleeder resistors. Feb 10, 2016 · Description. Just a quick vid of a Drake L4B linear amplifier driven by an infamous Pride KW1 and a Browning Mark 3 AM radio. controls functional (AGC disabled). With the grid chokes and grid caps removed from a L4B / L7, the drive requirements drop by 20-25 watts. $44. Type. Unplug the AC power cord from the mains outlet and allow time for the high voltage to discharge to 0 VDC. The Pride is on the low side and has the Nom Equipment Manual Section. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jun 26, 2009 · Pages 9-12 of the manual pretty adequately cover the operation of the amplifier, and the specifications in the front of the manual give you the drive requirements. Already replaced bad electrolytic in bottom. littlehiddentreasuresllc l4B. The unit installs easily in the remote power supply chassis and replaces both of the old diode/capacitor Since several other amplifiers such as the Collins 30L1 and the Heathkit SB-200 and SB-220 used the same type of cooling, this proved to be an acceptable cooling method. We have 1 DRAKE L-4B manual available for free PDF download: Instruction Manual DRAKE L-4B Instruction Manual (27 pages) Brand: DRAKE | Category: Amplifier | Size: 3. 5" caps but Amateur Amplifiers. Verify that the HV has bled down to 0 VDC on the L-4B multimeter. with a Dayton 4C761. At idle when not keyed, tubes are fine. 825. Discontinued. Select pages by clicking on the individual page number or manual section from the menu on the left. You either have to turn it on and leave it on or get a 20 amp circuit in there for it. Drake L-4B Linear Amplifier Type L4B-1 Instruction Manual 1978 Reprint USED. 60. A while later, I ran across an article while doing an List-post: < mailto:amps@contesting. May 12, 2007 · 73. If you using a small display screen you will need to scroll left-right & up-down to view the entire page. Nov 4, 2023 · Drake L-4B AmplifierMi sc Spare Parts. The L-4B consistently puts out 1500-1600 watts while being driven with 100 watts. Page 7. They are about $2. Drake Amateur Radio Equipment PM-400 Replacement Power Supply Module for L-4/L-4B/L-7 Amplifier $ 25. 7% positive; Drake Ham & Amateur Radio Amplifiers, Drake HF Ham & Amateur Radio Amplifiers, Sell now. It was a 100uf @ 50V. $12. Little Hidden Treasures LLC. I became interested in Full Break-In keying while operating CW during Field Day with the local radio club where an IC-7800 was at my disposal. Subject: An Inquiry into your eHam classifieds post : Drake L4B amp. One of the best manual tune amplifiers ever made. Jason N1SU suggested that I replace the stock fan. No nicks, scratches or discolorations just a little dust. I finally got one of these units brought over to. Seller's other itemsSeller's other items. deal fell through . The amp is currently owned by W4CNN and still puts out the legal limit with lots of headroom, even with the stock Drake power supply. This listing is for eight 270mfd/450VDC computer caps with screw terminals (new screws included) that are 1. Brand New. This Drake L-4, L-4B, & AC-4 RCA Adapter. 680 posts · Joined 2003. Fast & Free shipping on many items! The PM-400 is a complete replacement power supply module for the Drake L-4/L-4B/L-7 remote power supply. $25. W6LG demonstrates how he tunes up a triode ground grid amplifier. L. 7%. INSTRUCTION. $49. The L4B Amplifier Chassis Redesign. Electronic Bias Switching For The Drake Amplifier, by Garry Drummond / K4OR. Near perfect companion AC4 power supply (currently wired for. CW, AM and RTTY operation covering the ham bands 80 through 10 meters. Drake 2-B Receiver Modification to Add 160 Meters. This video is not a replacement for the written docs. HF Amp. Notice the small variac on the back panel used to adjust filiment voltage. On the T/R connection there is a definite problem- the linear puts out 60V but ONLY if driving the L4B with my yaesu operating in class A. through 10 meters. I have an L4B that I picked up in excellent condition, but with all things electronic, they sometimes need updating. b. Power requirements are 115 VAC 50-60 Hz 30 amps or Drake L-4B Amplifier Solid State Relay Modification. Put a new set in and same thing. The hint was the bottom was full of oil. Date Posted By Category User IP Address; 2012-07-11: You *must* login first, using the 'Login' link at the top of this page. I had a Henry Tempo 2K as well. It features dual meters. The Build May 23, 2024 · 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: DRAKE L4B Linear Amp Hi Voltage Recap Kit - Eight 270mfd/450VDC Screw Terminal Capacitors (1. com. straight microphone plug. So what does plate dissipation mean? Also, consider the 572b and 811a tubes. The output of the ICOM is well controlled at 100 watts, so I set up the RF power control to meet the Drake requirement for plate current (about 60-70W out) and have had no problems with signal quality on SSB or FT8. The Drake L-4B amplifier was designed and constructed in the 1960s as a two piece unit -- amplifier and high voltage power For sale: Drake L-4B amplifier for 80 - 10 meters. The amp has been upgraded with the Harbach ES4L4B Soft-Start/Soft -Key /Bias Module start boards. The L-4B uses two 3-500Z or two 8802/3-500Z or two 8163 or two 3-400Z zero bias triodes Linear HAM bands amplifier matching the T-4B, T-4XB, TR-4 transmitters. eimac tubes, I will remove the. In very nice condition including rear panel. I do not own a. Author. Press: Menu/Set/Function . Tuning a Drake L-4B. 00 $. Over the last 40 plus years the amplifier section has RL Drake L4-B Amplifier 2 Tube Sockets, Filament Choke (Complete Assembly) RL Drake. Great Amp! Time Owned: more than 12 months. Drake L-4B Linear Amplifier Manual . So we decided to build a 160m extension to one of the available amplifiers. The amp power supply has been rebuilt with Harbach PM-400 Replacement Power Supply Module rebuild kit. Homebrewing The Drake 1544 RV75/R7 Adapter, by Lee Craner / WB6SSW. to key its T/R relay. Total IMD from the amp is greatly improved, since the xcvr is the limiting factor. It describes unpacking the amplifier and power supply, installing tubes and chimneys, recommended amplifier and power supply locations, power requirements, and making initial connections for operation including jumper connections, low pass filter, antenna and ground requirements, and connecting an Drake L4B Amplifier Send this to a friend with an introduction. 95 SOLD. amplifier. CW, AM and RTTY operation covering the ham bands 80. Late last year I was complaining that the fan in my L-4B was not keeping. Has had new power supply filter caps and diodes installed; however, will include the new, never used, completed, Harbach compact rectifier board subsequently purchased to further Now Purchasing select amateur radio multi band linear amplifiers for refurbishment then re sale. the valves within their temperature rating with 50Hz mains, especially. 00. The high efficiency Class B Grounded Grid Circuit uses the new Eimac 3-500Z zero bias triodes. com! We Specialize In the Heathkit Sb-220 , SB-200, Drake L4B , Kenwood TL-922 , the entire Ameritron tube line and many others!!!! Now Offering Custom 160-15 meter 3cx6000a7 custom pa's. However, it is advisable to adjust the 7300's TX-Delay to 10 miliseconds. Required! Required! I have owned this amp for 31 years and has been sitting in this same spot ever since the day I got it. It's just something you can watch and pause as you do your steps according to the documentation. Does anyone know where the Zener or bias circuit is on this amp. Top Rated Seller Top Rated Seller. See details. Special financing available. Anyone got one? Or does anyone with an orphan power supply want to buy the linear with two unused Eimac tubes (fair warning: dated 1996 and not tested). New Listing DRAKE R-4B RECEIVER AND MS-4 SPEAKER #3. Purchased from a S/K Estate and then re-capped and fixed up and tested by Amateur Radio Operator Bill at Clairmont Skyland Radio and TV services in Gainesville, GA. The original switch is no longer available from any supplier that we know of. 5 to 30 MHz may be covered with some re­ alteration of the input circUit. 00 each at mouser, and their p/n is 527-cl200. Power requirements are 115 VAC 50-60 Hz 30 amps or Sep 17, 2023 · Drake L4B repair, mod and operation. It covers 80, 40, 20, 15 and 10 meters (10 meters not available on late production). Power requirements are 115 VAC 50-60 Bias zener substitute for Drake L4B amplifiers used for AM mode. pretty sure they are original. Has had new power supply filter caps and diodes installed; however, will include the new, never used, completed, Harbach compact rectifier board subsequently purchased to further Drake 2-B Receiver Modification to Add 160 Meters. Its gotta be bias. 375" tall). 99 shipping. Contact seller. Powered by separate power supply L-4PS. 375" tall and an exact fit replacement for the existing 180 or 210mfd/450vdc 4. When I acquired this amp, it was all in original condition including the power supply. Drake Manuals Menu Drake Home Page Drake Home Page The R L DRAKE Model L-4B Linear Amplifier offers continuous 2000 watts PEP-SSB, and 1000 watt DC. migsradio (1,941) 100%. Subject: Re: [DrakeRadio] Re: Electronic Specialties L4 / L4B bias, soft start, soft key board. 99. This Drake L-4B covers 80 to 10M with 2000W PEP SSB and 1000W DC. of of any unit of its manufacture which Drake L-4B Linear Amplifier Type L4B-1 Instruction Manual 1978 Reprint USED. May 21, 2007 · Greg_63. Has brand new RF Parts 3-500Z’s personally tested and running full output legal limit ++. Select TX Delay (touch-screen), then choose “HF”. Drake L-4B AmplifierMi. The selected page will appear in this section of the screen. From (e-Mail): To: KB9SI. All you need to to is replace the 240 volt jumper in the RF deck with two, in series, CL200 inrush protectors. This is a very nice, clean and fully operational L-4B w/ L-4PS power supply and manual copy. We choose the good old L4B by Drake. 38" dia x 2. L. With any normal xcvr operating in class AB, the xcvr's typ imd is a magnitude worse than the L4B. Classified: Drake L4B Amplifier Removed. then scroll using Multi-Knob to “TX Delay”. Puts out full power, on/off switch and blower are perfect. It covers 80 through 10 Meters, w/ 2 KW PEP on SSB, and 1KW on CW, AM, and RTTY with 100W PEP Drive on SSB; 75W on CW etc. on CW at full power. STANDARD WARRANTY R, Lo DRAKE COMPANY warrants each new radio product manufactured by it to be free from defective and workmanship and agrees to rera any such defect or to furnish a new part in exchange any pari use liv who tre frc ext Sh De. The ES4L4-B is a combination soft-start/soft-key/bias board for the L4-B amplifier. (_) Use the multimeter of the amplifier to read PLATE VOLTAGE. US $10. Item description from the seller. (_) Disconnect the remote power supply cable This document provides installation instructions for the R. Aug 27, 2021 · Here I show the repair of a Drake l4bEnjoy About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright RF Deck Built like a tank and plenty of air flow! This is my second 2x3-x00 amplifier. Seller assumes all responsibility for this listing. 500 watts in the cw-tune mode and. All frequencies 3,5 to 30 MHz may be covered with some realteration of the input circuit. The amp is in very good condition. Page with more info on drop down menu. High Speed Switching (QSK) For the Drake L4B Amplifier. I have not been disappointed yet with anything about this amp. Pre-Owned. After a short period of time, I fell in love with how smooth the 7800 operated in this mode. Your typ 100w XCVR, with it's PO reduced down to 75-80 watts, will exhibit much improved IMD. It has some scratches on the cabinet but looks good overall, particularly the faceplate with really looks great. 5 amps so that must be when it's first turned on. 938 lb) Price in first year of sale. (3113) 99. Net weight (2. The one weak link in the design is the combined AC power and SSB/CW TUNE rocker switch. So can only imagine the inrush current. WB4HFN Home Page Drake Techni. This L4B is the better amp over all. 00 Select options When the Drake L-4B or the Drake L-7 power switch becomes defective there are very few repair options except to replace it with one from a parts amplifier. This included the (L4B) amplifier section and the (L4PS) high voltage power supply. 2200W output Drake L4B RF deck retrofitted with a full output Eimac. The included external L-4 PS power supply is currently wired for 240 VAC S/N 6177. Mar 24, 2023 · Here I show the repair and modifications on a Drake l4b EnjoyAir variable is short for air variable capacitor. Works fine on 17 and 12 meters too. New amps are very expensive and ther After 30 or more years of service the L4B blower fan is starting to develop many issues due to age and deterioration. 9uF. 7% positive. Great deals on Drake L4b In Ham Radio Amplifiers. Drake AC4 Power Supply - Repair & Upgrade. or Best Offer. The amplifier was a very rugged amplifier and designed as a two final tube amplifier using the 3-500 or similar tube. But shortly after it is keyed with very little drive, the tubes start to glow. Opens in a new window or tab. lb ro ug tl sw sp ua jb se of