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Harris - Model 740 HF Transmitter 10 KW: Harris / RF High Frequency (HF) Model 740M - AUTOTUNE Transmitter / Amplifier Autotune - 2 to 30 Mhz
Rated at Continuous Duty - 10,000 Watts RF Output
This Transmitter utilizes a 4CX15,000 Tube as it's Final Power Amplifier, which as seen in the pictures is included in the amplifier
Pi-L Output Network for Best Transmit Spectrum Quality
Servo tuned Vacuum Variables in Final Power Amplifier
The Final Amplifier slides out for ease of servicing.
The transmitter is self contained and designed for either local or remote controlled operation.
Would be ideal for a HF Shortwave Station or Big Gun Ham Station, somewhere in the world.
As I recall, the Synthesized Exciter has approximately 100 MW of RF output, which drives
The Intermediate Power Amplifier (similar to a Harris RF-110A), which uses two 4CX1500B tubes and should put out 3000 - 4000 watts of RF output by itself. As removed from Commercial Service
We have many more internal pictures that we can email you.; Listing #1767135 - Submitted on 05/05/26 by Callsign W5AHN - IP: static-172-108-165-130.dlls.tx.frontiernet.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Ameritron AL-811: Used, in good condition Ameritron AL-811. $950 shipped anywhere in the USA. Paypal or Venmo.; Listing #1767066 - Submitted on 05/04/26 by Callsign AD0KI - IP: h96-61-77-127.ftcmco.broadband.dynamic.tds.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FOR SALE: Alpha 76 PA: Alpha 76 PA …Excellent Condition $1400.00 Can deliver to Dayton.; Listing #1767039 - Submitted on 05/04/26 by Callsign W8AJ - IP: 104-184-173-238.lightspeed.bcvloh.sbcglobal.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Yaesu FL-7000 HF Amplifier For Sale: Yaesu FL-7000 HF Amplifier For Sale:
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The Yaesu FL-7000 is a completely solid
state HF amplifier covering 160 thru 10
meters, including the WARC bands. It
includes a very heavy duty power supply
in it, operating the final transistors
at 48 Volts DC.
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It has two very large fans that provide
plenty of cooling and are relatively quiet.
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Although it has an automatic antenna tuner
built in, it is recommended that the tuner
NOT be used.
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It does operate full break in (QSK) on CW.
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Cosmetically, it is very good. It does have
a couple very, very, very minor scratches
that you can find if you look just right.
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Electrically, it produces full power, and
works as it should.
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This amp is a brute, which means it is very
heavy -- 66 pounds before packing for shipping.
That means that pickup near Ocala, FL is very
desirable, but I can ship it if you are willing
to pay the price.
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I would like $1200 for it.-
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Thanks. 73,
Ken Simpson, W8EK
Voice Phone (352) 732-8400
.; Listing #1766992 - Submitted on 05/04/26 by Callsign W8EK - IP: customer.mmmiflx1.isp.starlink.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
SB-230 for sale: Hello:
purchase this amplifier from a fellow that had it for a while, I have seen that amp working before and was producing about 475 watts with 75 watts in, but the fellow wanted more output and decided to replace the caps in the power supply trying to get more output(yes there is HVDC) ,dahhh.
well, I Decide to give it a try, I apply power on, NO SMOKE, HV was reading ok 2100vdc but meter went dead and no output.. no time to apply drive power..
I am not able to work on it..
everything is there, covers, feet looks very nice for the age!
I will sell it for parts!!! as is!! no returns..
paid $475. will ship conus $425.00 ,, or trade for SB-200, my loss your gain!! PayPal or Venmo accepted as payment.
more photos available on request.
thanks!
Hiram; Listing #1766855 - Submitted on 05/02/26 by Callsign AG4KH, Modified on 05/03/26 - IP: 47-200-254-199.fdr02.brnd.fl.ip.frontiernet.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
For Sale: Amplifier Relay Buffer: Don't burn out your radios keying circuit. Use an optically buffered keying relay to key your amplifiers. Draws very low current on your radios keying circuit. $50 delivered CONUS; Listing #1766901 - Submitted on 05/03/26 by Callsign KB5AAB - IP: ip-208-56-252-70.defastlink.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Tokyo Hy-Power HL-50B QRP Amplifier: Tokyo Hy-Power HL-50B QRP HF amplifier. 5 watts in to 50 watts out. Works as it should. $375 shipped. PayPal or Zelle.; Listing #1766749 - Submitted on 05/02/26 by Callsign WB1AFK, Modified on 05/03/26 - IP: mobile-107-77-223-182.mobile.att.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FS: SPE Expert 1.5F-KA Linear Amplifer: For sale fully refurbished as new legal limit amp. This amp was just returned to me by repair direct from Bob Hardie. Items that have been replaced:
New RF Board
New CPU
New P/S
New LDMOS
Some discrete parts on the BPF board.
This amp has never been used by me, it was a backup and only discovered the repairs needed when it was tried out. It should be as new now with full power out. It has been tested and aligned for all bands and power by Bob Hardie. Includes original box, carrying bag, invoice documenting the repairs and CD. S/N 174800029. Asking $3500 plus $150 shipped.; Listing #1766815 - Submitted on 05/02/26 by Callsign W6IBU - IP: 107-129-90-224.lightspeed.sntcca.sbcglobal.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Ameritron AL-1306: Amp works great as it’s suppose to looks great local deal will be $1800; Listing #1766697 - Submitted on 05/01/26 by Callsign N9RG - IP: 198.89.243.225; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Elecraft KPA500 500 W AMP # 1597 READ: Elecraft KPA500 Linear Amplifier # 1597 - please read :
$1999 Delivered - check, Zelle , PP FF ok.
You are looking at a good working amp that has a minor issue.
In Standby, the HI TEMP light comes on,and it faults.
As soon as it's put into operate,the fault goes away,and it puts out 500 watts no problem.
Maybe a sensor telling amp that is too hot when it is not ?
This happens when you turn it on,so it is not to hot.
I am not a tech guy,but I am sure there are guys out there who can diagnose this easily.
Please email with questions,
Larry k6ro; Listing #1766644 - Submitted on 05/01/26 by Callsign K6RO, Web Site: http://www.K6RO.com - IP: 99.37.37.86; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend