Always use the 6AS6 and not just any pentode.
My (poor) understanding is the design of 6AS6 g3 is as a control grid
proper, like g1.
The 6AS6 Data Sheet from Western Electric says it is for low power
applications at Hugh and Ultra High frequencies (this is from March
1947, so the data sheet is probably not talking about the same Ultra
High frequencies we think of)
The next Line is:
"The usual Control Grid and the suppressor Grid can be used as
independent control elements. The tube is suitable for use in gated
amplifiers, Gain Controlled amplifiers, delay circuits and mixers."
There is a 1949 data sheet that calls it a "Pentode (Dual COntrol)"
Experimentation with other tubes listed as "mixers" or dual control
tubes might be in order, Perhaps colour TV Martix and colour demodulator
types?
--
Charles MacDonald Stittsville Ontario
[email protected] Just Beyond the Fringe
http://Charles.MacDonald.org/tubes
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