Since the last posted on my Mojo 1484 build when I was pretty sure I was having OT issues, I installed a new OT. I've used Weber speakers and in general have liked Ted Weber's stuff, GRHS. So, I got their version of the 1484 OT. I had to build a bracket to raise it a bit so it fit in under the turret board, and the nuts are non standard, but otherwise it all fit and connected well. After I had done other clean up, re-dressing and some rearranging, I was hopeful the amp was going to sound good. It did. At least during the start up procedure it did. The light bulb current limiter acted exactly as it should, which it really had not done before. The voltages were still high, but with it plugged into the limiter it was close to dead quiet, and sounded good when played, no hum. So, I took it off the limiter to check the voltages. Hum. Not dangerous sounding like with the other OT, but enough to be bad. I checked the filament voltage. 7.2. With the limiter on it had been 6.3, exactly. So, I am thinking if I fix the voltage on the heater leads, I'm going to fix the hum. Also in researching hum issues, I saw that putting the output tube filament wiring out of phase (switching the leads around from the first output tube to the second as you wire in parallel) helps with hum. So, I did that. That did reduce it a bit, but it needs to be reduced more. I thought about diodes to lower heater voltage, but decided to go with resistors instead. Since affordable 10w .150 Ohm resistors are hard to come by, I'm going to build a broad with two sets of 5w .33s wired in parallel to fit between the PT heater leads and the tubes. This is bulky and will be a tight fit, but it should do the trick. Since the issue is still hum, I thought I should post an update to this thread.