You can only achieve 60% of a 12ax7's MU because its intrinsic resistance is too high to allow anything more in any practical circuit. The noise floor has nothing to do with the theoretical limitation.5150loveeddie wrote: Chris came here a few years ago (Ski vacation with his lady) we went to eat at a good restaurant in Montréal, was the first time I actually met Chris in person (we talk on phone a lot) anyway, he then start explaining me that the most you can get from a 12ax7 is 55-60% of the gain more then that that is «noise»
That's a very easy thing to do. You can use a transistor, MOSFET, etc and do a few things with it in order to achieve that. You can use it as a current mirror/sink, or you can set it up as a follower and bootstrap it, which is a form of mirror.5150loveeddie wrote:he has a mod/way to go up to 100% using a transistor....I don't have a clue how you do it still!! lol maybe it is a «diode clipping» thing a la C e rrem, it was still is experimental he says, might not sound right ...I don't know.....