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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: What tubes to use with this Interstage Transformers?

Oh Dave, don't you think you are still confusing the series resistor acts only like voltage dividing / current limiting in the source circuit?

I thought about it last night why yours work and mine doesn't. It is both true for the both of us. It's because DCR of the windings and it's just not fixed on all type of transformers, isn't it?

You are using 10K OPT to measure your plot? Obviously, the DCR is high on them resulting a low load (low current flow through the primary 10K winding) on the source circuit thus creating less voltage drop on your source with 5K series resistor. And less voltage drop from the 5K resistor means more voltage appears at 10K ohm input at the primary. Combining bigger voltage with less current drop in the DCR of primary will result in a complete charge of the internal C in the winding.

Thus, it doesn't reflect the distorted waveform I mentioned earlier and the reason you aren't aware of it before.

I will post pics with all that explained earlier. Please standby.

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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