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RE: What tubes to use with this Interstage Transformers?

For the sake of showing actual low frequency information, a 50 ohms source with a 1K series resistor is no different than a tube with an Rp of 1050 ohms.

A fair bit of good info has been offered up for you to digest here and I have a strong suspicion that there is no way this transformer has any chance whatsoever of loading a 10 / 801 and getting anywhere near flat from 20-20Khz into the grid of any triode. Simply placing a 5K resistor in series with the input signal and 100pf of capacitance across the secondary will quickly tell you if you have any chance of being flat from 20-20Khz with a tube like the 10.

dave

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