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Re: [Amps] GU74B in GG configuration

Subject: Re: [Amps] GU74B in GG configuration
Date: Tue, 28 Aug 2007 11:20:42 -0700
List-post: <>
On 28 Aug 2007 at 10:38, Andy Pfeiffer wrote:

>  I am planning to retube an older amp and I have two GU74B tubes at
> hand.
> Can they be used in GG configuration?

Yes, they can be used in GG configuration.  But DO NOT tie the grids 
together and treat the GU74B as a triode!  The control grid will draw 
way too much current, and be destroyed.  The correct screen voltage 
must be applied or the tube will be killed in short order. 


George T. Daughters, K6GT

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