Anyone recognize this set?

[dieseljeep]

The later models used a 21YP4. The screen curvature looks like a Y.

[Kamakiri]

Still the same heater voltage, and I'm all sorts of confused. I'll pull the 5U4 and power it up again and see what I see.

[dieseljeep]

Originally Posted by Kamakiri

Still the same heater voltage, and I'm all sorts of confused. I'll pull the 5U4 and power it up again and see what I see.

I don't think, that model uses a 5U4. Selenium rectifier, voltage doubler. It uses a small heater transformer for most of the tubes. The sweep tubes and a few others are in series across the line.

[Kamakiri]

Aw frig. I didn't look at the chassis too closely. I kind of figured I'd run into seleniums the size of toasters in this damn thing. After all, Raytheon wasn't exactly known for a quality product in the TV realm.

One of those things that I knew would be a PITA to restore, but figured that if I didn't do it nobody else would, and what the heck, at least I had a starting point.

This is the screen shot I had from last power up. Potential is there, anyway....but this one might wait for a while.

[Kamakiri]

Well, it does have a 5U4, so nyah

This picture tube issue is weird. With a "remove shorts" procedure, the tube tests into the good range, but the H-K leakage pegs the needle. Not sure what type of picture that'll end up giving.....?

Now here's a thought.

The 21FP4 uses electrostatic focus. I believe I can use a 21EP4 which uses magnetic focus. I have a good 21EP4. Just have to rig up a focus magnet assembly.

[Electronic M]

Could also grab an isolation 'booster' and skip the modification.

[dieseljeep]

Originally Posted by Kamakiri

Well, it does have a 5U4, so nyah

This picture tube issue is weird. With a "remove shorts" procedure, the tube tests into the good range, but the H-K leakage pegs the needle. Not sure what type of picture that'll end up giving.....?

Now here's a thought.

The 21FP4 uses electrostatic focus. I believe I can use a 21EP4 which uses magnetic focus. I have a good 21EP4. Just have to rig up a focus magnet assembly.

I can't believe I'm wrong again! Third time this year and it's only March 14th.
I've never ran across a Raytheon with that control panel, that had a full transformer and 5U4 chassis.

[Kamakiri]

Yup! Here's a shot of the nasty dirty chassis.....

[dieseljeep]

Originally Posted by Kamakiri

Yup! Here's a shot of the nasty dirty chassis.....

I didn't think they built that chassis in a 21" model. It looks like there's mounting holes, for a PM focus unit.

[Kamakiri]

I split this thread off into another thread about the Raytheon just to keep things organized, we can pick up on it there