[AMPS] Re: 8875 = 4cx400 ?

[Ron Hooper]

George T. Daughters wrote:
> 
> hi larry and all,
> 
> >     As a point of interest, and totally off my subject, I noticed on the
> > Web site for surplus sales of Nebraska, (HTTP://www.surplussales.com) in
> > the tube pricing list an entry for 8875's showing the Svetlana 4cx400 as an
> > equivalent tube. This surely can't be, can it ??
> 
> no, i don't think so.  the 8875 is a triode; the 4cx400 is a tetrode!
> 
The 8875 is also designed to be cooled differently from the 4cx400's as
well. It can not directly replace the 8875. It will fit the same tube
socket so if you want to modify the cooling and the wiring to meet the
spec on the 4cx400 I guess one could say it was a replacement. Many
folks are looking to replace the very expensive 8875 and recover the
cost of the amps like the MLA 2500 which uses them. I am courious if any
one has grounded both grids in the 4cx400 and tried driving it like a
triode? 
Ron W4WA



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