US amplifiers.

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Kaliphan
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Re: US amplifiers.

Post by Kaliphan » 17 Jul 2018, 12:03

May I suggest that you take into account my original post where I say I *WOULD NOT* recommend buying an amplifier kit where the schematic is not published?

I stand by that statement until Telstar publishes his schematics, I may well change my mind at that point but I'm ignoring your posturing until that time.

There are plenty of tests already on the net for the Chinese kit, there are, as far as I can find, none for the Telstar one.

I'm very pleased your neighbour was a GCHQ design engineer, if that's true are you sure he's happy for you to publish his name on a public forum given his ongoing commitment to the official secrets act?

Blackolive
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Re: US amplifiers.

Post by Blackolive » 19 Sep 2018, 10:05

A useful read is here

http://archive.retro.co.za/archive/Moto ... ionOCR.pdf

Ive also attached a linear amplifier circuit with biasing

Ive an X-force 200 here that needs fixing. The prvious owner put 100 watts into it, Im hoping they havent popped the power transistors and its just taken the switching circuitry out.

the "bias" arrangement on these amps is arranged by a reverse connected diode standing the base of the power transistors at 0.6 volts.
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