I hate the RCA 630 chassis

[Montman]

Bandersen : what was that picture tube you used in your 6TS30 restoration.

[bandersen]

Originally Posted by Montman

Bandersen : what was that picture tube you used in your 6TS30 restoration.

5AXP4. It was designed for using while the chassis is up on the workbench. You can leave the 10BP4 safely tucked away.

A few things to keep in mind. The 5AXP4 does not used an ion trap or focus coil so you have to leave them off. If you don't, the image will be very blurry and pushed off center.

[Montman]

My ion trap is the PM type

[Montman]

Thanks N2Ixx and Bandersen. I have a chance to pick up another 8TS30 and its Air King equivalent 8TS30.

[Montman]

What's your advise concerning those non-polarized yellow capacitors. The ones under a 1 MFD. I know in power supplies they must be polarized, but what about under the chassis with plate to grid connections and when they are used to filter to ground.

[bandersen]

It doesn't matter which way you hook up the modern plastic film caps.

[Montman]

How about that HV capacitor c-187 in the HV cage. Any thoughts about testing it and replacing it if its bad.

I also got two more 8TS30 tvs today.

[N2IXK]

The ceramic "doorknob" HV caps rarely go bad in my experience. No need for routine replacement.

Hard to test it except in the set, under operating voltage. If bad, it will arc over or short out the high voltage. Similar caps are still made, but expensive. If you actually need one, look on eBay, or ask around here and somebody will have one.

[M3-SRT8]

Originally Posted by N2IXK

The ceramic "doorknob" HV caps rarely go bad in my experience. No need for routine replacement.

Hard to test it except in the set, under operating voltage. If bad, it will arc over or short out the high voltage. Similar caps are still made, but expensive. If you actually need one, look on eBay, or ask around here and somebody will have one.

What about the two resistors underneath the 1B3-GT?

[M3-SRT8]

Originally Posted by Montman

How about that HV capacitor c-187 in the HV cage. Any thoughts about testing it and replacing it if its bad.

I also got two more 8TS30 tvs today.

Just picked one up myself. From a good collector friend. Untouched, as far as caps are concerned, but somebody had replaced the HV CRT lead with a big cupped color set one. I'll replace that with an original RCA one. Otherwise, nice original condition. I'm going to restuff everything and put the chassis in my sweet condition Air-King A-1000 cabinet, which came with a thoroughly botched recap job in a rusty moldy chassis. I'll scan and copy and print the original Air-King chassis label and affix it to the new chassis, and nobody will ever suspect.

Well, close to nobody...

[Montman]

Thanks. All this info sends me in the right direction. Just picked up another 2 - 8TS30 chassis.

[Montman]

M3-SRT8: Air-King A-1000 cabinet - that was one of the sets I got today. In good condition two.

I'll have to check out the two resistors underneath the 1B3-GT (233/235.)

Bandersen has an excellent video series on youtube of his 6TS30 restoration. Been studying that closely and he had a section on checking those two resistors. Good luck with your Air King. If those scans check out ok, let me know. I will be restoring that cabinet too. I think the decals are the same as the RCA decals and you can get them on the Antique Radio supply site.

[N2IXK]

The 2 resistors under the 1B3 socket are known to fail, particularly the 1M one in series with the anode lead. They can both be checked for value from the topside of the chassis, without dismounting the 1B3 socket.

[Montman]

On my 8TS30 the schematic says R226, R227 go from C224A to C220A, however, I have three chassis: two RCAs, the other a Fada version of the 8TS30.

On the Fada they follow the schematic: C224A to C220A but the two RCA's they don't.

The two RCA's go from C224A to C221B. The ohms between C220A to C221B is 44.7. I expected 0 ohms if it was just another route point but its not.

Has anyone encountered this difference? I'm inclined to keep it identical to the two RCAs since I can rule out a replacement mistake. But this puzzles me.