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Old September 7th 05, 12:52 PM
Tim Shoppa
 
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Unless you want to restore this valve equipment as
much as possible to its original state ,you could of
course adjust the screen voltage with a
carbon track potmeter , using a high voltage transistor
,a high voltage zener diode and a few more
passive components.


True. This transmitter only has a single HV winding, so all the B+'s
for the non-final stage go through big power dropping resistors, and
then there's all the screen bias dropping resistors too.

I haven't added it all up, but this transmitter probably dissipates
close to 70W when not key-down in dropping resistors just to avoid a
second winding on the power transformer. If I were to re-do anything
I'd start by adding another power transformer for screen bias and
non-final B+'s.

Tim.

 
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