[TMC] GPT-750 origin

[1oldlens1]

I thought the GPT-750 was distantly related to the Hallicrafters HT-4/BC-610.  That is a unitized half KW transmitter capable of very wide application. The GPT-750 is, of course, far more advanced in design.Sent from my GalaxyRichard Knoppow Los AngelesWB6KBL
-------- Original message --------From: "J.F. Samuels - K2CIB via TMC" <tmc at mailman.qth.net> Date: 4/27/26  10:33 PM  (GMT-08:00) To: "Castellano, Michael (USACT)" <Michael.Castellano at usdoj.gov>, tmc at mailman.qth.net Subject: Re: [TMC] GPT-750 origin The 750's that I worked on in final test were the USB/LSB/ISB/CW ones in 1958-1959.  We used the serial number on the test sheet, but I don't know if they were ever matched with shipments.**/73, John, K2CIB/**On 4/27/2026 2:56 PM, Castellano, Michael (USACT) via TMC wrote:> Been running my 750 almost daily (80cw) for the past 45 years  (not a typo) with NEVER a breakdown.>> I'd like to know a bit more about it's origin. Is there a lookup by serial number somewhere?> It would be great to know the original user.  TNX & 73 from KM1R ex WA1CUN, K1FTH>> Michael John Castellano KM1R>>> ______________________________________________________________> TMC mailing list> Home:http://mailman.qth.net/mailman/listinfo/tmc> Help:http://mailman.qth.net/mmfaq.htm> Post:mailto:TMC at mailman.qth.net>> This list hosted by:http://www.qsl.net> Please help support this email list:http://www.qsl.net/donate.html______________________________________________________________TMC mailing listHome: http://mailman.qth.net/mailman/listinfo/tmcHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:TMC at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html