general-el: Power tube S-22
Hello, on my S-22 chassis on the paper stamped on the back side i read, back of 80 tube, two TUBE RCA UY247, there are missing, while looking the schematics there are two 45 tubes, what are the right tube i va to insert?
if you check the data here, you will see that the 247 is a penthode with the same heater voltage as the 45. So this may be a later upgrade. A look at the socket will show which it is!