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In Reply to: RE: Innerstage vs R/C coupling. posted by Michael Samra on February 25, 2017 at 10:47:01
My 2 cents...
IT's can be sound like a built in compressor sometimes. I find the use of these with horn systems can really shine. You also have to watch the build of IT's. Some are bifilar wound which means the polarity in must equal the polarity out or the design looses high end big time!
RC, problem with DHT's is that as you approach the bias point with the input signal, the R increases the voltage as the grid is drawing current. This rebiases the output and causes depleated output.
RC, pentode, problem here is usually R is low and C is high and there are not many good large C's out there for coupling... or they are $$$$
LC, I like grid choke as the Rdc of L is low so grid current is not an issue. Also the AC Z of the inductor is really high so you can use a relatively low C value.
Thanks,
Gordon
J. Gordon Rankin
Follow Ups:
"I like grid choke as the Rdc of L is low so grid current is not an issue."
Is it the DCR of the choke or the reactance of the choke that is in play?
The tube is being driven into grid current by a periodic signal, right?
The peaks of the input signal.
The grid is falling in and out of the grid current condition at a rate equal to the rate of the music peaks.
It seem to me that the reactance of the choke, at that frequency, would come into play.
Am I wrong?
Tre'
Have Fun and Enjoy the Music
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