Hi all, I rebuilt a 5e3 clone earlier this summer and it sounds amazing. However, the PT I used (Hammond 290BX) is running hot voltages across the board and is hot to the touch after about 30 minutes of operation. It’s not too hot, I can keep my fingers on it for a few seconds. I’m wondering if there’s the potential to do any real damage or god forbid start a fire. I’m alternating between tung sols and JJ 6v6. The Tung Sols sound better and have better B+ numbers, but are slightly red plating. The JJs are operating above spec, but are not red plating despite pulling much more current than the tung sols. Im hoping some smarter folks than me can either ease my worried mind and tell me to play it as is (some of you did say this in my build thread) or confirm a way ahead to remedy the higher voltages. Here are my specs and measurements for each set of tubes. PT: 290BX, rated to 138mA HV, 330-0-330 Actual HV voltage: 342-0-342 NOS Raytheon 5y3 Fender Deluxe Reverb 8ohm OT 270 ohm bias resistor Bias numbers with 12w tung sols (red plating): Voltage at rectifier (OT CT): 395 V4 plate: 388 V4 cathode: 20 V3 plate: 388 V3 cathode: 20 P-c voltage for both tubes: 368 V4R- 188.2 ohms V3R- 190.8 ohms V4 current: 7/188.2= .0371 37.1mA V3 current: 7/190.8= .0366 36.6mA .0371*368 = 13.65 .0366*368 = 13.46 Avg 13.5w dissipation Bias numbers with 14w JJs (not red plating, but much higher current draw): Voltage at rectifier: 390 V4Plate: 381 V3 plate: 382 V4 Cathode: 22 V3 cathode: 22 P-c voltage v4: 359 P-c voltage v3: 360 V4 current = 9/188.2= .0451a V3 current = 8/190.8 = .0419a .0451*359 = 16.1W .0419*360 = 15.1w 15.6w avg plate dissipation Ok, so after all of that, here are my questions: - Given these measurements, Is it worth putting in a 360 ohm cathode resistor so I can play with the tung sols, whose sound I like much better? Is there a way to compute how much this will raise the plate voltage? - is the high current the JJs are pulling going to hurt my PT (pulling about 90mA, PT rated to 138mA) - should I just play the tung sols with that high plate dissipation even though they’re red plating? - does anyone else have the Hammond 290BX, and does it run hot (temperature) in your experience? thanks for any help y’all can provide.