Quote:
Originally Posted by bandersen
I tried getting at it from the front and the knob came apart 
I think the smoked plastic goes towards then then white paper then the clear plastic then the black ring 
After a bit of poking around, I realized the bulb holder slid off pretty easily. The holder clip is the ground and the wire clips onto the tuner.
It appears to be a #240 bulb - 6.3V @ 0.36A.
Specs: http://www.taillightking.com/images/...0240%20USA.pdf
All I had handy was some #1847 (long life #47) and an LED equivalent. They only draw 0.15A and I expect are not as bright.
It works but is really dim.
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When I restored my 25MC33 Zenith roundie ten years ago now, I too had the tuning knob come apart. The two sections are just lightly crimped together. I had to use some JB Weld to make a more permanent fix. The channel display looks about as bright as mine does with the correct lamp. These are not very bright. I love the metal cabinet. I wish mine were in a metal cabinet. They are more compact and less prone to nicks and scratches. They are great sets and the color is unbeatable when everything is working right.