Re: Teledyne GPD462

brian wrote:

I saw a paper (https://apps.dtic.mil/sti/pdfs/ADA030178.pdf) , active
antenna referring to a GPD 462 . - Hybrid amplifier
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Does anyone know what the internal circuitry was?

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That’s one of Avantek’s “low cost” hybrid MIC amplifiers. I used its
brother GPD-464 a fair amount back in the 80s. They were cheaper than their
very nice GPD-211 iirc.
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AFAICT it’s a vanilla NPN Darlington, like most others of that era.
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I still have the databook someplace, I think.