I have a Radio Shack tester. When I put it on a battery, it reads it correctly.
When I connect it to the right bias et, I get a reading of .338
When I connect it to the right bias et, I get a reading of .048
I know it still has the selenium rectifier . . .
When I connect it to music, it plays, though I do have a nice hum in both speakers.
When I try to adjust each bias screw, nothing really changes . . .
When I flip the tubes, the readings follow . . .
The meter is set at 2V