turned on amp with no PI tube...

[ninjadave7]

is there permanent damage potentially? it was on for about 1 minute before i realized why there was no signal...

[JoeM]

I doubt you hurt anything. Some run Fender BF style amps with V1 pulled anyway.

[ninjadave7]

ok. i think its v3 on mine, no signal passed without it.

[MWJB]

It's virtually impossible to damage an amp by turning it on with a tube missing, certainly with a preamp/PI tube out. If an amp is cathode biased, it's a very bad idea to run it with less than the full power tube compliment, because they usually share a cathode resistor & pulling tubes rebiases the remaining tubes hotter, which can blow them. Fixed bias amps that run their power tubes at the limit of what the tube can take can be problematic, because less tubes means less current load on the PT and already high voltages can rise to dangerous levels.

[Jazz P Bass]

The bias voltage on the output tube is what is important.
Without a phase inverter tube, the output tubes will do nothing but sit there and idle.
No biggy.

[ninjadave7]

phew... thanks guys