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Re: [Amps] Cathode resistor in GG amps

To: "Tony Brock-Fisher" <barockteer@aol.com>, <amps@contesting.com>
Subject: Re: [Amps] Cathode resistor in GG amps
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Tue, 25 Sep 2007 11:39:15 -0400
List-post: <mailto:amps@contesting.com>
> I've gotten my early AL80 one-lunger to work pretty well, 
> and added many protection mods (no, no nichrome involved). 
> One thing I noticed is it has a 27 ohm resistor (actually 
> 3 x 82 ohm 2 watt) in series with the cathode. I think 
> this provides negative feedback, and also increases the 
> required drive for full output to 100 watts. Am I correct 
> here? Does it improve linearity? Are there any downsides 
> to it?


That's right Tony. A series resistance right at the cathode 
adds negative feedback.

That generally increases IM performance.

73 Tom 


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