DOUGLAS SNOWDEN wrote:

Has anyone used one of these for a linear? I think they are pentodes and
have 8.3v filament.

Doug N4IJ




Hi

Seems really to be a pentode

Here is one links found by Google
http://cgi.ebay.co.uk/GU-46-4-1000A-...cmdZVi ewItem
There is be a mistake in the link European symbol QB means tetrode
Pentode is typed as QE
Here is a russian link
http://www.tubes.ru/techinfo/Broadcast/gu-46.html

As in linear amplifiers I remember them beeing used in grounded grid
circuit (all grids bound together and RF earthed and zener biased for
correct AB class )
Drive to filament where ferrite rod chokes are used.

I have used above mentioned tetrode QB 5/1750 successfully in
GG-linear amplifier.

73 , Risto OH2BT