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In Reply to: RE: Cathode Follower Output posted by Al Noakes on September 15, 2014 at 05:07:03
"6AS7 requires crippling swing fromn the driver due to it's low mu ."
When the 6AS7 is used as a cathode follower, isn't the voltage swing at the grid determined primarily by the transformation ratio (OPT) and the desired output power?
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Gain of a CF is approximately mu/mu+1 . Work that one out with the 6AS7 , then recalculate with a mu> 5 triode
Al
"mu/mu+1"
OK, I understand now. I usually think about CF gain as 0.9 or so, and I don't bother to calculate it during early planning. The 6AS7 is much different than other tubes I'm considering though. I'll definitely need to weigh it against the anticipated driver swing before going to the trouble to prototype. Thanks for bringing this up.
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