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RE: What tubes to use with this Interstage Transformers?

"No matter from where I look at (i.e. From the input pin of the transformer or from the output pin of the FG, I only get the same answer). That resistor is in series with the input pin of the transformer. Thus, creating a current limiter and (variable) voltage drop across it depending on the load impedance of the transformer based on the different frequency."

That's right but what you are not understanding is that the output impedance of a stage is always in series with the "input pin of the transformer".

What this means is, if you have,

1. a source circuit with an output impedance of 5050 ohms

or

2. a source circuit with a output impedance of 50 ohms with a 5000 ohm series resistor added

They will both have a total output impedance of 5050 ohms and will behave the same.

Tre'


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