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RE: What tubes to use with this Interstage Transformers?

Tre,

I agree the Cmiller is something to watch out for in all Triode circuits. It effects the Frequency roll off and the the previous driver stage driver capabilities.

But I think you meant the current in the primary needs to be able to supply 4 the load current of the Secondary.

So theoretically speaking, 20mA at 100Vrms (2W) driving power requires a little more than 25Vrms of 80mA of the power applied to the IT primary. So in the case of 801A, 70Vp-p (or 100Vp-p) with 80mA of current should be about 1.6W of power. But it doesn't sound very right, right?

So, I am looking at a little more than 150Vp-p with 40mA of driving AC current for about 600Vp-p with 10mA Grid current into the Output tube? I think this sound much realistic. 150Vp-p through 1:4 will be enough to compensate for the Cmiller from the Output tube.


Regards,
James
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.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.


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