Quote:
Originally Posted by The Radium King
from what i've heard, the au7 is a driver tube. ie, it can carry more current/power than an ax7. so is the at7. ax7 and ay7 tubes can't handle the same amount of current as the au7 and at7. so, the au7 can be used in the reverb driver position, where you want the current but not as much voltage gain (ie, to tame an overly 'wet' reverb sound). in a pi slot you want gain and power, so the au7 doesn't perform well here as an at7 replacement, as you don't get the voltages to drive the power tubes. i've also heard that au7s make great cathode follower buffers in marshall/bassman setups, as they overdrive nice when slammed with a signal.
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I have a Bassman RI, so I'd put it in the middle preamp tube position (i.e between V1 and the phase inverter position)?