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RE: What tubes to use with this Interstage Transformers?

I would really like to know what these IT's are since if the specs you publish are true, that is a pretty incredible engineering feat.

Getting a -0.5dB at 20hz in any inductive device to load a 10 (5K source impedance) is no small task to begin with since you need around 100hy's of primary inductance. Adding 18ma of unbalanced DC and accounting for the 135V of AC signal on top of it for the primary adds two more layers of complexity to the design, Now realizing that this is just for the primary and you now need to allocate a good part of the winding window to the secondary that requires 4-5X the turns of the primary and finally get flat response to 20Khz is amazing.

dave

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