Another local Hoffman! COLOR!

[Yamamaya42]

i also found this out there :P

https://tinyurl.com/3vh2v5zb

[Yamamaya42]

the NTE120 Selenium Rectifier for Convergence SHOULD be here Fri, and I'm hoping it will clear up the odd problems I'm seeing..
Right now I can't even adjust R/G horz/vert Left, I turn the pots, and nothing happens

[Electronic M]

I've gotten away with using 1N4007s for convergence rectifiers, though I now stock shottkeys for the task.

[Yamamaya42]

This is what is telling me it HAS TO be the selenium diode pack.

http://suzaku.live-evil.org/hoffddd.jpg
Pin 8 goes directly to the pulse winding of the FBT, and I know the 320v signal has to be there because those horizontal pulses are vital to burst amp / color killer / chroma bandpass, and color is perfect.
R25 R28 R227 R228 OK, so X7 it is!

[Yamamaya42]

Originally Posted by Electronic M

I've gotten away with using 1N4007s for convergence rectifiers, though I now stock shottkeys for the task.

if i was not able to find these so easily, that IS what I would do too!

https://www.amazon.com/dp/B008UTWAG0...roduct_details

[Yamamaya42]

new part installed in convergence PCB.

https://www.youtube.com/watch?v=tsiwjEj02I4

i will do at least 1 more pass to tighten it up.

[Yamamaya42]

As you may have noticed from the videos posted, I have decided NOT TO attempt the cataract repair on this CRT at this time, the deciding factor was the broken pin 12, and the pure luck I had soldering a thin copper wire back into where it used to go, I want to do absolutely nothing to disturb it until I have something to replace it with.

Right now, the cataract is noticeable, but tolerable, next tax refund, I will highly likely hit ETF up for one of many they have in stock that will fit ( 25AJP22 25BAP22 25UP22 23VBAP22) and so on, and put it in, and THEN try to fix the cataract, and if successful, keep it as a reserve, if unsuccessful, no HUGE loss, I'd be on the new one from ETF.

But as it is now, I was lucky to patch it up and get it working and not willing to roll the dice on cataract repair in the state that it's in.

[Yamamaya42]

2nd convergence pass done.

https://www.youtube.com/watch?v=ZtVrJK2JkH0

[Yamamaya42]

I have pretty much done all I can with this set in the state it's in, the CRT is in noticeably used state, what I call a “fair” or just above fair condition.
Still hope to try to get an NOS 23 inch at the start of next year, though shipping from ETF will be brutal, but this set is worth it, ( still waiting to hear back from them.)

The convergence repair went perfectly, the 2nd pass went through the normal round robin adjusting of static center R/G/B and R/G horz top/bot, which upset static center R/G, and thus changed R/G horz top/bot, you know the drill!
After about 30+ min of going round and round like this, things were so close that I no longer had to rotate the magnet discs to get the center to line up, just shift them ever so slightly.
There is still some minor nonlinearity in the dynamic convergence, but no where near as bad as when I started.

There is some minor shadowing of the video, the IF may be a bit off, but I'm not gonna worry about that much right now.

[Yamamaya42]

more pix
http://suzaku.live-evil.org/rocky-1.jpg
http://suzaku.live-evil.org/rocky-2.jpg
http://suzaku.live-evil.org/rocky-3.jpg


this time a pro made DVD. :O

[old_tv_nut]

I'd say the green edges add something special to that show.

[Yamamaya42]

Originally Posted by old_tv_nut

I'd say the green edges add something special to that show.

I know , but as mentioned above, I don't wanna risk the weak repair on pin 12 by removing the CRT + Cataract removal unless I have another tube to fall back on. :/
If it was not for that broken pin, I would have fixed the green gunk by now.

[old_tv_nut]

Patience. Unless you must move it out for some reason, you may find a replacement tube.

[Yamamaya42]

I'm kinda on the fence here, should I try the edi solid-tube r-3ds3 in the set, or stay with the 3A3C that's working in it now?

The r-3ds3 was not really made for this set, but should work (guess) as 1 of the 3 cathode pins does match up, pin 2 the others go nowhere, 6,8.
https://www.datasheets360.com/pdf/8329566707472946635

This is the only info I can find, not exactly for the edi, but I'm sure all r-3ds3 tubes are the same.
So, on one hand, the 3A3C is working OK, but on the other, using the r-3ds3 will lower the load on the FBT/HOT cathode. Choices, choices...

[Yamamaya42]

Well, I tried the EDI Solid-Tube R-3DS3 for a few moments, and it did not catch on fire, ran it for 5 min, it did not even get warm.

will try to run it longer.

Which is odd now, that the SK3756/508 version fried in 90 sec in my other set.
tube seen here.
(https://www.ebay.com/itm/284317947319)