I have worked on a few tube and hybrid, round and rectangular screen color TVs, and whenever I do I start to hate pulling and reinstalling the chassis repeatedly. I was thinking that it would be better to use a small inline tube to eliminate having to deal with dynamic convergence, and because inline tubes are cheap and plentiful. Is this a good idea? And would it matter much which CRT I use? I was thinking of using this working Trinitron SD-59 I've had sitting around for a long time would this be a good choice?
http://i1095.photobucket.com/albums/i469/ElectronicMemory/DSCN0931.jpg

Tom C.

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Well I was wondering how practical doing it with an inline tube would be because inline tubes can be had for basically free, but with how much delta gun tubes cost if I had to locate a small delta gun CRT and yoke, the cost would make it cheaper and easyer to just track down a vintage test jig.

Tom C.

I agree with Andy... You'd need so much in the way of support circuitry, that you'd be better off buying a complete jig. And that little Trinitron tube might be worth enough on eBay (if it's in good shape), to go buy a nice complete 13 or 19 inch test jig ;) . That tube goes in all the 5" Sonys including the highly-collectable KV-5000.

Charles

Sadly when carying the tube back to the garage it fell and lost vacuum.

I hate when stuff like that happens!

Tom C.

Won't work, Won't work, Won't work! You need a tube that works with about 25KV and a inline or trinitron tube will not work.

I have an RCA jig that uses an 18v tube. At some point the original crt was replaced with a used GE, probably out of one of those awful CE/C2 chassis sets. Well, if that will work, any delta gun from the 70s should suffice. One repairman I met had a roundie jig at the back corner of his bench. When it became too obsolete he built his own modern unit by taking a BPC 25" set with a bad chassis and wiring it up.

My Sylvania CK3000 uses an inline-gun 13" CRT. I doubt there is anything special about the CRT or yoke in this jig, but these units do use "yoke programmer" plug-in devices that adapt the yoke for tube versus solid-state sets among other things. Ideally, you would start with the full schematic for a jig so you could make yours out of an old 13" TV.

Keep looking in the classified ads here and on other forums, and save a search of "test jig" on Ebay, and you may find a complete jig as I did.

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There's an RCA jig that was recently listed over on ARF. I'm guessing it's a
19".

No affiliation

http://www.antiqueradios.com/forums/viewtopic.php?f=15&t=169861

Not sure if it's still available, but here's one of the 13" Sylvania's. Should be a good deal considering it's recently tested and comes with adaptors/cables.

http://www.videokarma.org/showthread.php?t=250648

Either one of those units Kevin mentioned would be good to have. The Sylvania is a 13", the RCA is a 19". They both can use the same adapters as well. I highly recommend trying to get an actual jig like these, because they have a built-in HV meter in addition to compatibility with multiple chassis types.

Deleted.

Consider these a go/no-go type of test tool; they are absolutely not very enjoyable to watch. I suppose in a day in and out situation, you'd learn to work around their shortcomings. Not knowing better I was pretty disappointed in the lack of convergence on the outside edges of my CK3000. For some reason I thought the modern 13" CRT would have done better.

What would be nice is if there was a small CRT that could be dynamically converged to these older CTC chassis. Just for the learning experience of going throught the convergence process on the bench.

I just don't think that a test jig is in my budget right now. That is why I wanted to make one out of a cheap or free BPC set.

Tom C.

Does this set have seperate cathodes and grids?
http://i1095.photobucket.com/albums/i469/ElectronicMemory/DSCN1179.jpg
http://i1095.photobucket.com/albums/i469/ElectronicMemory/DSCN1190.jpg
It is an inline set that uses a 320BTB22 CRT? If not I'm probably going to throw it out.

I tried googleing the number but could not find a data sheet for it, or anything else of relavance to my question (very frusterating).

Tom C.

Tom, what is the model number of that Panasonic TV?

It is a Panasonic model CT-2012.

Many shops used a junker 19 inch portable. Look for one with a high voltage focus, delta gun CRT. There will be convergence and other problems, but it will work OK for testing 21 and 25 inch chassis. GE, Sylvania, Philco, RCA, Magnavox and others all had 18/19 inch sets that would work. Look for the right one.

You will need to make up adaptors as you encounter various makes/models for repair. That is true of any test jig.

It is a Panasonic model CT-2012.

I was hoping I had the manual for that one, and could provide some more information. Unfortunately I don't.


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