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HF Amplifiers

Displaying ads 21 to 30 of 239 ads in this category.
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 FS: EIMAC 4-400 TETRODE LAMP ON OAK BASE  
PENDING SALE
For Sale: Power Tetrode EIMAC 4-400 Tube on Oak base with shade.
Same size tube and base pins as the EIMAC 3-500Z.
Assume it is a dud.
Lamp socket is standard Edison, medium type.
LED lamp provided, too.
Email me for close up photo.
$55.00 and $9.00 shipping in the CONUS.
PayPal, check or USPS MO. I am gd in QRZ.
Will be well protected.
See my other ads for Drake, Heath and AM gear.
Listing #1543135 - Submitted on 06/15/21 by Callsign WA1BRI, Modified on 06/20/21 - IP: 47.199.186.223
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 Excellent NOS Eimac 5CX-1500A Tube  
Eimac 5CX-1500A NOS tube sent to CPI for certification of tube output, tube meets new tube specs, certification sheet shipped with tube. Tube is used in Henry Amps 4K & 4KA amplifier.
REDUCED asking price is $400 plus shipping. Payment requested by bank/postal money order or check (sorry no PayPal).
Thanks for looking! Richie N2AUG
Listing #1542748 - Submitted on 06/13/21 by Callsign N2AUG, Modified on 06/20/21 - IP: ool-45769c5b.dyn.optonline.net
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 WTB non working HF Amplifier
Looking for a project. A non working newer generation HF amplifier.
Thanks
Kevin
Listing #1543646 - Submitted on 06/20/21 by Callsign K8SU - IP: rrcs-173-197-249-75.west.biz.rr.com
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 FOR SALE/TRADE: SB-220 GI7B conversion  
Heathkit SB-220 converted to a pair of GI7B tubes. Conversion/upgrades include:
1. New pair of GI7B tubes w/custom stainless steel sockets
2. New technology parasitic suppressors
3. New black aluminum front panel w/case painted black to match
4. New Harbach complete power supply rebuild
5. New Harbach soft-start module wired for 120VAC
6. New K4POZ adjustable bias board
7. New solid-state timer for 90 second filament warmup
8. New 12VAC at 5amps filament transformer
9. New T/R 12VDC relay and 17ma keying
10. New 20 amp quiet power switching relay saves On/Off switch
11. Diode protection & LEDs on both meters
12. Copy of K4POZ conversion schematic and new bound copy of full manual
Works on all bands: With approx 40w 80m SSB in, showed approx 1kw+ out. $1000 professionally packed & shipped via FedEx to conus address (no PO/APO) or $900 meet/pickup in San Antonio, TX area. May trade for HF transceiver equal value & condition. Can email additional photos.
Listing #1543551 - Submitted on 06/19/21 by Callsign KD5ZSX, Modified on 06/19/21 - IP: cpe-67-11-117-243.satx.res.rr.com
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 FS: Collinss 516F-2, LV 275V regulator  
Due to the 1956 design of 516F-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. KWM-2(A)and 32S series transmitter get lot of troubles. I have a solution to keep the LV to exactly 275V either transmit or receive mode.Using 500V MOSFET and series of Zener regulators,LV is now tightly regulated which helps keep the VFO with no drift and no audio hum as it works as ripple filter.The board is 22mm x 30 mm by size, made with SMD components and can be fit to the sidewall of power supply. Price is $35 plus $5 for USPS. Send me a check to my QRZ.com address. Other Voltage output is available by request. Famous High Quality 30L-1 power supply and relay boards available.Please ask to ykimpower at gmail.com for details.
Listing #1541561 - Submitted on 06/03/21 by Callsign K6HM, Modified on 06/19/21 - IP: 75-37-192-218.lightspeed.lsatca.sbcglobal.net
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 FS: OM Power OM2000A+  
Nearly mint OM2000A+ with less than 50 hours of operation (see images noted below). Protective plastic still on the touch display. Originally purchased to remote my station, but have decided to go a different direction. I am the original owner and purchased the amp from Jay at Array Solutions in late Nov 2019. Can provide a copy of receipt + original manual and factory tuning datasheet. Non-smoking environment, kept covered when not in use (cover included). Will ship in original boxes. Never faulted or tripped warnings (see images noted below). Works as it should with no issues - less than 25 watts produces 1500+ watts. Full set of images here--> https://photos.app.goo.gl/pZodhaCbaabUQt7v7 <--(cut and paste the URL into your browser). Happy to do a live demo via Zoom or answer any questions. 719.660.9178. $5700 shipped CONUS. -- Kelly N0VD
Listing #1543572 - Submitted on 06/19/21 by Callsign N0VD, Web Site: http://www.n0vd.com - IP: 63-156-219-5.dia.static.qwest.net
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 FS: METERS SET, MATCHED 100MA & 300MA  
For sale: A pair of USN Panel meters.
100mA and 300mA, both tested and working.
Nice black face and in excellent condition.
Made by Westinghouse in the USA of course.
Take a 2 1/8" mounting hole; overall diameter is 2 5/8".
Will have the movements shorted for shipping to prevent damage.
$19.00 shipped in the USA. Email me for another photo or overseas shipping.
See my other Classic meters and ads for Drake, Heathkit, EICO and AM gear.
PayPal, check or USPS MO; I am gd in QRZ.
Listing #1541055 - Submitted on 05/30/21 by Callsign WA1BRI, Modified on 06/19/21 - IP: 47.199.180.120
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 WTB: Power transformer for Collins 30L-1
Well, the dork from whom I bought this 30L-1 thought that, "well it blows fuses, let's try a 15 amp fuse in place of the 8 amp fuse to test the amp further". Thanks to that, both primaries of my transformer are open.
Well, the amp is totally rebuilt and decent cosmetically so it's worth finishing.
Does anyone have a good transformer for it?
Not looking for a handout, just a good transformer at a fair price...
Gary
Listing #1543495 - Submitted on 06/18/21 by Callsign W0DVN - IP: c-69-180-166-42.hsd1.mn.comcast.net
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 ALPHA 78   
I am selling a pristine Alpha 78 no tune amplifier which I purchase from a friend who bought it from the original owner (silent key ) in Florida . He is a radio station engineer and checked it out .He never used it sold it to me I might have used it for 2 hours. Look at my qrz page I have more amps. then I need.. Everything works as it should, need to make some room in shack I have more pictures if needed from a clean non-smoking shack..$2,000.00 worth every cent
Listing #1543482 - Submitted on 06/18/21 by Callsign W9BB - IP: 108-92-149-125.lightspeed.cicril.sbcglobal.net
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 For Sale: Peter Dahl 5KV Transformer  
For Sale: Peter Dahl "Universal" 5KV Plate Transformer.
This is a new, never used transformer. It measures 12" wide by 10" deep and is 12" tall. It weighs in at whopping 156 Pounds! It is not for the faint of heart (or health).
$1,195. Available for pickup near Denver, Colorado.
N0UN
Listing #1543366 - Submitted on 06/17/21 by Callsign N0UN, Web Site: https://www.n0un.net - IP: 23.kellin.net.2.57.198.in-addr.arpa
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