[Amps] Need GU-74B info

[gdaught6 at stanford.edu]

On 29 Aug 2006 at 16:03, Rob @ Peg Pohorence wrote:

> Hello all, I was wondering if the GU-74b tube could sustitute for a 3cx800a7, Maybe someone has already done this change?

The GU-74B WILL NOT substitute for a 3cx800a without considerable 
modification to the circuitry.  The 3cx800a is a triode, and the GU-
74B is a tetrode... and it's a tetrode that will NOT do well if it is 
connected as a triode (screen directly to the control grid).  
However, if you supply the correct operating voltages, it is a very 
good tube indeed... it's a 4CX800A.

73,

George T. Daughters, K6GT