Sony KV-1320U (Japanese market) Trinitron restoration

[vol.2]

I have heard tell that the "restoration" setting on the Sencore units is actually good for this.

It doesn't "rejuve" the guns, it just does elevated heater voltage and beam current at the same time.

[cj_reha]

Originally Posted by vol.2

I have heard tell that the "restoration" setting on the Sencore units is actually good for this.

It doesn't "rejuve" the guns, it just does elevated heater voltage and beam current at the same time.

It is essentially the same process, just with a much lower current over a longer time. Definitely gentler, and my first escalation when trying to resurrect a CRT I care about. But I honestly find in most cases, just baking the tube at an elevated filament voltage works fine

Anyway, some progress over the past couple days. I got the donor set split apart and the CRT removed and cleaned.



Much better!



Over the next couple days I will similarly split the 1320U apart. No broken yoke plastics so far - wish me luck!

I've been studying the chassis and comparing it to the photos and documentation I have for its American counterpart, the KV-1220U. A major difference I see right off the bat is a voltage selection tap for 100 or 110V, as well as the fact the set substitutes a circuit breaker for regular glass fuses, of which there are three:



I have, of course, moved the fuse to the 110V tap, but am still presently running it off a variac to be as gentle to the power supply circuits as possible. I may experiment with lowering the B+ at full line voltage to make it slightly less inconvenient to use, but that will be a project for when the set is set up and just about wrapped up.

One last thing. Does anyone happen to know a good substitute for these neon bulbs? There are four on the neckboard being used for arc suppression. The Sony P/N is 1-519-013-13. It appears the circuit glue went corrosive and is eating the leads on all four (one even fell off!). For the life of me, I cannot find an industry equivalent for these or any kind of cross-reference at all, and of course they are not for sale anywhere I've looked, even the surplus sites that are pretty good at keeping weird parts. For now, I can scavenge some from the KV-1203 which uses a few of the same type, but it's not an ideal situation.



More soon!

[vol.2]

Looks awesome. Going to be a beautiful set when done.

Originally Posted by cj_reha

But I honestly find in most cases, just baking the tube at an elevated filament voltage works fine

So I would just hook up the tube and turn the heater voltage on the Sencore up and let it sit?

I seem to remember someone advising me to also have current running to the cathodes while doing this for the proper effect, but then I've also encountered suggestions for just leaving the heater at like 8-10Vs or something and letting it simply sit there.

For now, I can scavenge some from the KV-1203 which uses a few of the same type, but it's not an ideal situation.

Can you just solder some new leads onto the old neon bulbs? If they are still functional, there's no reason that you can't reuse them.