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RE: What tubes to use with this Interstage Transformers?

I am unclear as to why this is suddenly about distortion from my signal generator. I am reasonably confident that if I measure the distortion at the 50 ohm output of my signal generator at 20hz into the primary of an output transformer, and then repeat the measurement with a 5K series resistance the distortion levels at the output of the generator will go down.

If for some reason the goal is to keep a constant input level at the DUT then I see where there could be an issue since as AC current increases, more of the source voltage will be lost across the series resistance requiring an ever increasing output from the generator but the entire goal here is to see a realistic frequency response graph. Attempting to see accurate information of a transformer intending to load a 10 by feeding it from a 50 ohm source doesn't give any meaningful information.

dave

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