[dconant]

Thanks Rod. Since the screen grid is not tied to the plate then my tubes are pentode right? I see the candohm ties to the cathodes and the resistance will be 300 ohms from point 5 to 3 but I don't find the cap. Are the tubes cathode biased? Can you tell me what the Effective Load Resistance and power output is for my 42 tubes from the specs here https://frank.pocnet.net/sheets/093/4/42.pdf

I am trying to determine what output transformer to replace my bad one. I have a Hammond 125C but I am afraid the wattage is too small. It is an 8 watt transformer. I have a speaker that measures 5 ohms with a vtvm. Is that an 8 ohm speaker or 6 ohm speaker and can I use that transformer? I'm thinking I can use pins 4 & 6? I have tried it and it seems ok to me but I don't hear that well so it may not sound the best. Is it hurting the tubes?