Help - Mk IIB Preamp tubes

[bobgoal65]

Need Help. I just recieved a set of pre-amp tubes from Doug's. How do I know which sockets are V1, V2, V3, V4, V5? I never changed tubes before...in case you couldn't tell.

 

[Boogiebabies]

The one far right, close to the output transformer and in the can, or tube shield is the V1. They go right to left, so going left from the shielded tube you have V2, V3 and V4. The V5 is the one to the left of the power tubes and is the Phase Inverter, or PI.

Enjoy.