I had stopped after doing the initial heater, pots, and PT wiring/soldering. In the intervening years I can see that my previous lead dress/heater wiring, especially, is not great. But I figured in the interest of getting it done it would be better to see what I had rather than pull it all apart again.
I'd read up on here how to implement better grounding techniques, so I deviated somewhat from the Ceriatone layout document on the board ground bus star ground (near the input jack).
I followed Rob Robinette's startup procedure, using a lightbulb limiter, and it all seemed ok. Voltages all seemed in spec. Tube heaters and filament wires were working on Standby, and all was well taking it off Standby. I added output tubes and connected a speaker with all the pots all the way off, and everything still seemed good.
But I got no sound output at all. Diming the Volume and MV produced no hum or white noise at all, and the same for the EF86 channel. Plugged in a guitar with no change.
I thought maybe the OT was the issue, and measured resistance with the rectifier and output tubes pulled and the amp off. It's a Classic Tone 40-18037.
OT primary
- Red - Brown: 316 ohms
- Red - Blue: 337 ohms
- Brown - Blue: 365 ohms
- Black (COM) - Orange (16 ohm): 0.6 ohm
- Black (COM) - Green (8 ohm): 0.7 ohm
- Black (COM) - Yellow (4 ohm): 0.5 ohm
I took it off the lightbulb limiter to measure the real voltages/resistance at the PT, tube pins, and OT.
The PT is a Classic Tone 40-18035.
PT Primary
Black (COM) - Black/White(120): 121v
PT Secondary
GND - Red1: 301v
GND - Red2: 302v
GND - Green1: 3.41v
GND - Green2: 3.42v
Yellow - White: 6.9v
I'll post the tube pin voltages next.