How to tell if preamp tube is phase inverter

[BrettT]

Hi all. I have some preamp tubes that were originally in my Dual Rectifier. I'm wanting to use two of them to replace the tubes that are in my ADA MP-1, but one of the spares is a balanced phase inverter, and I'm not sure which one it is. Is there a way to tell which one it is by using a multimeter?

 

[PaoloJM]

Hi all. I have some preamp tubes that were originally in my Dual Rectifier. I'm wanting to use two of them to replace the tubes that are in my ADA MP-1, but one of the spares is a balanced phase inverter, and I'm not sure which one it is. Is there a way to tell which one it is by using a multimeter?

No. You need a tube tester.
Even then it's pointless, either tube will be fine.