SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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Original Message

RE: The road ahead

Posted by Tre' on June 24, 2012 at 12:24:00:
"Some of my application info. is proprietary, but I think you can find out from others that your figures are wildly-- not applicable to this particular item."
I very seriously doubt what you have said.
Having said that, I was speaking not about the frequency/phase response of the amplifier as a whole. Just the response of the filter that is very much reality and has to be dealt with.
How you may or may not go about correcting this problem after the fact is not my concern.
I feel that it is always best to avoid this types of problems to start with rather than compensate for them after the fact.
"While the formula is correct, the assumptions being used to insert figures into that formula-- in this case-- are incorrect."
The output impedance of your 7b4 driver stage is easy to measure or calculate.
The Miller can be easily calculated once the interelectrode capacitance's and the mu are measured, so your use of the term "wildly" is not called for.
If my numbers are off, please feel free to correct me and give us the correct numbers.
In any event, with a 7b4 driver tube with a plate resistor the output impedance will be too high for a DHT's Miller capacitance. The resultant low pass filter will have consequences in the audio band. There's just no way around that.
Tre'