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RE: What tubes to use with this Interstage Transformers?

The reactance of the Miller capacitance of the output tube will be reflected back to the driver tube through the IT.

If the Miller capacitance of the output tube is 100pf (just picking a number here), it has a reactance at 100kHz of 15.9k ohms

If the IT has a impedance ratio of 1:16, that 15.9k ohms of reactance will be reflected back to the driver tube as 975 ohms of reactance, just as if the Miller capacitance value has been increased 16 times.

Once you know what output tube you are going to use, then you can calculate the requirements for the driver tube (output impedance and current delivery capability) that will allow you to use those ITs successfully.

As a side note; transformers don't have impedances per se. Different transformers are meant to work into different ranges of impedances and that has to do the the inductances and capacitances present in the transformer winding.

Transformers only have winding ratios.......but if we take a transformer meant to work in a circuit with a 15k impedance and try to to operate it in a circuit with only 1k of impedance, as an example, there will not be enough inductance to "support" a 1k reflected impedance. Going the other way causes problems as well.

Tre'


Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 08/24/16 08/24/16 08/24/16
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