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Original Message
Any place you are using them for gain
Posted by Chip647 on October 9, 2020 at 18:50:05:
However if you are using 12AX7 in a Preamp into a 12AX7 front end you are either talking about a serious overdriven guitar amp or your equipment uses prodigious local or global feedback. You will here the difference most in a position where the tube has little local feedback squashing it.