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RE: What tubes to use with this Interstage Transformers?

Yes, it is true when the FG+5K resistor is connected to purely resistive LOAD.

But we can't do that when the reactive load is connected on the other end of FG+5K series resistor.

I don't think I can explain you any better than I did to Dave.

You need to see a FG as an amplifier with a feedback loop so the output impedance remains near constant as possible under different loads. Any drop in voltage and current and phase coherence is being compensated by the FG internal circuitry. That is something an external series 5K resistor can't do. And that series resistor is not the origin of the actual DC/AC current or source.

That's not even remotely the same or close to a true 5K output impedance AC source.

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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.


Edits: 09/08/16
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