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[Amps] Purpose of cathode resistor?

Subject: [Amps] Purpose of cathode resistor?
From: Bill Turner <>
Date: Wed, 28 Dec 2005 08:41:05 -0800
List-post: <>
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.)

I can think of two possible reasons, but I'd like to hear from the pros.

Thanks in advance,

73, Bill W6WRT

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