290 phase inverter tube?

[Bennie]

Hey could someone please tell me what the 3 positions are for the 290's pre-amp tubes. I'm trying to find the phase inverter and I can't find this info anywhere.
Thanks

 

[crane]

According to schematic, V3 is the PI.

 

[Bennie]

looking from the front of the unit is that left middle or right? Thanks for the help

 

[crane]

Sorry, I was a bit tired when I replied.... Pi (there are 2 of them, it's a stereo amp) are V2 and V3. I don't know which tube it is on the amp, but you can try this :
The PI are probably the tubes closer to the power tubes. If it's not clear enough, remove one tube (amp of) and test. If only one channel isn't working, it's a PI, if the 2 channels are muted, then it's V1 (input tube for both channels).

 

[Bennie]

Hey Crane, Thanks for the help. I'll be able to figure that out for sure.