Does the input impedance of the amp change when we use different input tubes? Finally getting a chance to try an ecc81 and I'm getting a really weird result. I'm used to tubes giving me a different sound but this takes it to another level. I'm getting a big boost in the lower treble and a complete suckout of the midrange. I'm guessing that my passive preamp can't drive it properly and/or the ecc31 can't properly drive either the 807 or 6f6 that I've tried. Any guesses?
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