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Need help with THP -1.5 KFX not keying: My THP AMP stopped keying with my IC7800. The amp tracks band changes, fan working, no fault LED’s on, cables connected not loose. Could the issue be an internal fuse, bad transistor on relay/PA board. Problem started suddenly.
Does anyone know a ham who works on these THP amps? I live near Philadelphia.
Any advice would bee greatly appreciated. Thanks
Bob
K3SRO; Listing #1757751 - Submitted on 02/03/26 by Callsign K3SRO - IP: pool-108-16-253-90.phlapa.fios.verizon.net; Click to Contact -- Send this Ad to a Friend
FOR SALE Ameritron 811 H w/ manual & cor: I am offering for sale a ameritron 811H
Very low hours, no pets, no smoke. Works as it should. No scratches or dents. Will not ship but will meet you part way. I live in the Houston area. I will send pictures by text to your phone if you want. Asking $800.00 cash or postal money order. You can reach me at 281 630 3938 any time after 12:00 noon. Thanks Gene; Listing #1757717 - Submitted on 02/02/26 by Callsign N5ROE - IP: 47.221.93.212; Click to Contact -- Send this Ad to a Friend
FOR SALE- AMERITRON ARB-704: MFJ ARB-704 Radio to Amplifier buffer interface. This was being used with my IC-7300 that I no longer have, but can be used with most any Radio. $50.00 CASH OR WALMART MONEY ORDER. SHIPPING POSSIBLE If Buyer pays. Any Questions just ask.; Listing #1757714 - Submitted on 02/02/26 by Callsign W3IDX - IP: c-67-172-16-111.hsd1.pa.comcast.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Mercury Lite WANT TO BUY: Want to buy a Mecury Lite Amp. Someone mayby moving up and have one to part with? Only contact me through this site to discuss what you have.
Thanks Jerry; Listing #1757703 - Submitted on 02/02/26 by Callsign K9JJJ - IP: 208.157.188.31; Click to Contact -- Send this Ad to a Friend
FOR SALE: Sprauge Capacitors: Have 8 sprauge 200UF 450 volt NOS capacitors never installed $60.00 plus shipping USA only personal check or postal MO; Listing #1756070 - Submitted on 01/17/26 by Callsign N8SST, Modified on 02/02/26 - IP: syn-184-057-230-179.res.spectrum.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Alpha 76A 2-tube $800: Alpha 76A 2x8874 amp available at Orlando Hamcation.
Cosmetically very clean. Has the low-drive mod. Should be good for 1kw or slightly less. Wired for 220v. Note - input connector is RCA connector rather than a more conventional SO239. This was common to ETO/Alpha amps of this vintage and can be changed, or you can use an adapter. Serial #6742.
$800
Pickup available at Orlando Hamcation. Will be at the FCG flea market tables. Contact me for details or with questions.; Listing #1757696 - Submitted on 02/02/26 by Callsign W4WF - IP: 108.240.195.85; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Icom IC-PW1 Amplifier: This is from my father's estate. This is is main station amplifier and was in use when I disconnected everything. Asking $1750 plus shipping and boxing. I will drop off at Fedex or UPS, have them box, insure, and ship at buyers expense. Willing to travel a reasonable distance from south west Michigan to meet up. SN #1200. I have not tested this myself, I have been out of the hobby for 25+ years, but this has been in service up to me disconnecting the station. Smoke Free Home. Please email if interested.; Listing #1757670 - Submitted on 02/02/26 by Callsign N8UGD - IP: 45-26-131-187.lightspeed.gdrpmi.sbcglobal.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
PW-1 WANTED (PARTS UNIT): PW-1 Needed for parts, Any Shape, just let me know what you have? I'll USE PayPal for payment & shipping; Listing #1757664 - Submitted on 02/02/26 by Callsign WA4SRE - IP: 152.sub-174-193-114.myvzw.com; Click to Contact -- Send this Ad to a Friend
REduced ! Flex Power Genius: Mint Flex Power Genius amplifier! Full output at 220v, about half power on 120V. Little use, no digital mode use. Comes with original box, 220V power cable and 2 120V power cables. This one's a real winner! $4350 plus actual shipping cost. I prefer Zelle or MO. PayPal plus 3.5%.; Listing #1757653 - Submitted on 02/02/26 by Callsign KK8ZZ - IP: ec2-3-128-18-6.us-east-2.compute.amazonaws.com; Click to Contact -- Send this Ad to a Friend
RadioDan RBI-1 Amp relay buffer: Amp relay buffer RBI-1 from RadioDan, for older amps with high relay voltage to protect the keying circuits in newer radios. Needs 12vdc.
$50 shipped, check or PP F&F; Listing #1757610 - Submitted on 02/01/26 by Callsign W5RJJ - IP: ip-67-209-218-72.bacavalley.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend