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RE: What tubes to use with this Interstage Transformers?

"If you add an external resistor to the source (FG, Amp, Preamp, Battery; etc.), it's just become part of the load circuit and does not do any impedance transformation to the source circuit. I guess it only took about 60 posts to get to this point."

It seems t me you are misunderstanding a basic point about equivalent circuits. What Dave Slagle was saying seems to be correct. A source of 50 ohm impedance, in series with a 5K resistor, can be viewed as a source of 5050 ohms impedance.

It doesn't matter, from the point of view of analysing the total circuit, whether you view it as a source of 50 ohm impedance, driving into a load of 5K resistance in series with the transformer, or whether, on the other hand, you view it as a source of 5050 ohms impedance driving directly into the transformer. It is the same circuit either way you view it.

But it is perfectly valid, and useful, to view the 50 ohm output impedance generator plus the 5K series resistor as a 5050 ohm output impedance generator. The circuit as a whole doesn't care whether the 5K resistor sits inside the box labelled "signal generator," or if it sits outside the box.

Chris


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