Zenith Roundie from DC 1st pictures

[rca2000]

Originally Posted by Tubejunke

I must have gotten lucky on at least one thing with my Zenith. It has the 25LC30 chassis and uses .5A solid state diodes instead of a tube for rectification. It's good to see an extended ZENITH thread! I wish I had time to get somewhere with my Zenith! I want to find out what is making the horizontal output plate glow red and smoke from underneath. I'm sure that its a capacitor or THREE, as my set was dormant for at least 10 years. I took off the nice access cover on the bottom and at a glance could see two large (probably 1 watt) resistors sitting side by side that have heat bumps all over them where they have been cooking. I didn't see anything charred as I would expect after seeing smoke more than once.

Well, the silicon diodes may give the 25LC30 chassis and those like it a bit more reliablilty--but there is just SOMETHING SPECIAL about watching those two big 3dg4 rectifier tubes come on line---and power the chassis. BTW__ONE of them will actually be enough to power the set---but it will overheat, as I had that happen on my 29JC20, when one 3DG4 was not making proper contact and not working,. the picture did NOT shrink or bloom--but the plates did glow a bit on the one working tube.

As for your overheating HOT, probably a 6HF5, as I have the same set with remote (25LC20Q) across from the 29JC20 (and mine DOES work, at least the last time a had it on, but has a VERY bad cataract on a GOOD tube--) I would make sure my 6U10 H osc tube and caps and such around it was ok, as it sounds like you are losing drive. Be sure you osc coil is good too.