[Amps] cathode to ground in tetrode amp

Partain, Chuck Chuck_Partain at maxtor.com
Mon Jan 30 11:13:33 EST 2006


ya
 
 

 <http://www.angelfire.com/nb/ni4l/gu84b.html> http://www.angelfire.com/nb/ni4l/gu84b.html 
 
Look down at the ONE tube schematic.
 
This is the only one I have seen for HF so far that's not too convoluted.
 
 
 
 
 
 -----Original Message-----
From: Bill Turner [mailto:dezrat1242 at ispwest.com]
Sent: Monday, January 30, 2006 11:11 AM
To: Partain, Chuck; amps at contesting.com
Subject: Re: [Amps] cathode to ground in tetrode amp


ORIGINAL MESSAGE:

At 07:14 AM 1/30/2006, Partain, Chuck wrote:



OK, getting into this more and more every day and learning. Looking at some designs on this GU-84b
amp, I see a lot if not most of the cathodes have resistance, some a lot(30k) some little (.7) to ground.
The screen grid and control grids are not grounded and have respectively ~350 and -150v on them.

Why wouldn't it just essentially go to ground? what does the R do in series?

thanks as always.

KA1MWP




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Is there a schematic we could look at? 

73, Bill W6WRT




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