What could Account for This? RCA 9TC-240 Power Issue

[Yamamaya42]

Originally Posted by Chris K

I did trace it out and it is all wired correctly...but still no sound so I'm going to need to start tracing backwards through the audio circuit. Before I had some pops and cracks when I moved tubes around but now the speaker is silent...and it was before I did the re-wiring work. Also, somewhere along the line, someone replaced the 6AG5 converter and RF amp in the tuner with two 6BC5 tubes. There doesn't seem to be too much of a difference in performance when I went back to the 6AG5s.

Well, if you touch the center of the pot with a screwdriver (2) with it set midway while touching the screwdriver, you should hear the telltale hum, and you know at lead the pre amp and output works.