Bill Turner wrote:
> I have a question for all the amplifier experts out there.
>
> In this schematic:
>
> http://members.ispwest.com/dezrat1242/cathode.jpg
>
> there is a 250 ohm resistor connected across the fuse/zener. What is
> the purpose of that resistor, and why is that particular value
> chosen? (I have also seen 200 ohms used.)
My non-expert guess: if the fuse blows, it prevents the filament
transformer secondary from rising to a very high positive voltage,
possibly exceeding it's insulation rating.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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