...snip.....
(Mr. Rauch:)
>Someone asked about why tetrodes aren't used. Rich gave a cost
>example. Let me give a technical reason.
The cost example was PENTODES, Mr. Rauch.
>
>.......That's
>why a high MU tube is more stable in a regulator, ...
Does this make sense?
'High Mu' (Mu = 100 to 200) triodes need much grid current--and much
drive power--in order to draw their maximum rated anode current. Mu = 2
triodes, like the 6336, need NO grid current--and NO drive power--in
order to draw their maximum rated anode current. Seeing a high Mu triode
in a regulator is about as likely as seeing a low Mu triode in a G-G RF
amplifier. ........ If you guessed that all of this relates to the
question about what types of tubes were used the Class AB1 Triode RF
amplifiers, congratulations.
>........... It is also more difficult to
>obtain high efficiency with a pentode .....
Outside the Rauchian World, it is universally acknowledged that pentodes
are more efficient than tetrodes.
Rich---
R. L. Measures, 805-386-3734, AG6K
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