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Re: [Amps] Purpose of cathode resistor?

To: Bill Turner <>
Subject: Re: [Amps] Purpose of cathode resistor?
From: Vic K2VCO <>
Date: Wed, 28 Dec 2005 09:33:14 -0800
List-post: <>
Bill Turner wrote:
> I have a question for all the amplifier experts out there.
> In this schematic:
> 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.
Vic, K2VCO
Fresno CA
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