I pulled the 5U4 rectifier and did a power up test. All the tubes lit up (or so I thought) and voltages on the power transformer secondary looked good.
I figured this would be a good opportunity to try out my Tele Check external test CRT.
It has it's own yoke with long wires ending it alligator clips. Same for the CRT socket and HV lead. I read the hookup instructions and think I got it all correct.
I put the 5U4 back in and hooked up a meter to monitor the B+. Turned it back on, but no B+. Checked the fuse - it's good. Hmm...
Traced out the circuit and discovered there is a B+ interlock in the speaker plug. I unmounted it from the cabinet and tried again.
Now, I got good B+ - right on spec and hiss from the speaker but no HV.
Closer look at the tubes revealed the damped tube was dead.
I replaced it and tried again. Bingo! I have a raster. Not enough height, but a bright image and sound. Reception is only fair.
After a little control tweaking with the height control maxed out. Great starting point for the restoration. No doubt some of the caps are leaky and tubes weak.
