[Amps] Cathode resistor in GG amps

[Tom Rauch]

> 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