> Same dual 4-1000A g-g amplifier, different question. The
> designer used a
> series string of diodes to provide grid voltage.
> Fifteen diodes marked "PTC 2050" I have been unable to
> find any reference
> to these. I removed one and tested it like
> a zener, and never detected a breakdown voltage up to 35v,
> that's where I
> stopped. Might someone recognize the part
> number. I would like to complete the documentation
> accurately. Thanks.
Is the amp grounded-grid cathode-driven?
Does it have screen and bias supplies?
What's the HV?
Which way are the diodes pointed? Anode to positive source
or cathode towards it?
73 Tom
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