I proceeded by installing the 5U4 used in the 300 volt supply. That's enough to get the AM and FM radio modes working
Neat to see the 0C3 gas regulator fired up. First time a tube glowing purple in a TV is good thing.
When you are in FM or TV mode, the signal strength meter on the left is activated.
Later Dumont models used a 6AL7 indicator tube.
Sound is weak and the tuning dials are off - especially in AM mode, but I do have sound.
