Today I opened up my 1972 Marshall 50 Watt. I was curious as to what tubes I had in there. The preamp tubes are nothing special. But the power tubes are unlabeled and have a dimple on top so I'm thinking ...well I don't know what they are. Can anyone help identify these power tubes?
My guess would also be EL34.
Have seen the dimple in this type of tube before.... don't think it's anything that unusual.
You know how you can blow your breath on a mirror an fog it up? (Not really blow...kind of a haaa).
If you do that on the glass of the tube sometimes it will bring out the ID.