I remember someone saying that the high mu triode in the EM7 being a bit inconsistent in parameters but I can not remember the details. Anyone familiar with this issue? Is it differences in mu or gm from sample to sample?
That might have been me. I used the 6EM7 as the driver in an amp several years ago. There was a large variation in the gain of the first stage that followed the tube. I used CCS loading to maximize the gain. I simply selected some matched tubes and continued testing. I didn't test the tubes for the reason why.
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