Convergence ?

[timmy]

Same with my Motorola some days the convergence is good other days it’s alittle off as it may be static in the rug it sits on.

[Yamamaya42]

The biggest question that I always had was exactly WHERE to place the parts on the neck of a 21fjp22(a), convergence clover, ETC, cause of the internal markings, you can't see where it goes like you can on later rectangular delta types, on which you can very easily see where to put it.

But I can never find a definitive answer for the rondies saying it goes, HERE!

SO, I have it placed exactly as it was on my GE CTC-15 clone set when I first got it, down to the mm. in placement.

[old_tv_nut]

Originally Posted by Yamamaya42

The biggest question that I always had was exactly WHERE to place the parts on the neck of a 21fjp22(a), convergence clover, ETC, cause of the internal markings, you can't see where it goes like you can on later rectangular delta types, on which you can very easily see where to put it...

So very true! With my 21AX, I did a lot of fiddling, looking for the position with maximum effect and then comparing with the un-dimensioned illustrations in the service literature, readjusting, round and round. The results I get for both purity and convergence on this rebuilt tube suggest to me that the replacement gun may be slightly rotated from nominal position.

[reeferman]

Originally Posted by Yamamaya42

SO, I have it placed exactly as it was on my GE CTC-15 clone set when I first got it, down to the mm. in placement.

Down to the mm is getting pretty serious!

[Yamamaya42]

Originally Posted by reeferman

Down to the mm is getting pretty serious!

Well, i took a ruler, and measured how far every part was on the clone was from the socket cap, and place that same distance on my RCA.

http://suzaku.live-evil.org/GE-ctc-15-clone.jpg

http://suzaku.live-evil.org/rca-ctc-16xl.jpg

that is assuming they were correct on the clone in the first place!

[jr_tech]

Originally Posted by reeferman

Down to the mm is getting pretty serious!

Perhaps +/- 0.25 inch would be adequate (for placement of neck convergence parts)

https://frank.pocnet.net/sheets/168/2/21CYP22.pdf

jr

[Penthode]

Originally Posted by jr_tech

Perhaps +/- 0.25 inch would be adequate.

https://frank.pocnet.net/sheets/168/2/21CYP22.pdf

jr

As +/-0.25" is the range of adjustment, convergence can be within a few mm. on the edges and smack on in the center.

[Electronic M]

Originally Posted by Yamamaya42

The biggest question that I always had was exactly WHERE to place the parts on the neck of a 21fjp22(a), convergence clover, ETC, cause of the internal markings, you can't see where it goes like you can on later rectangular delta types, on which you can very easily see where to put it.

But I can never find a definitive answer for the rondies saying it goes, HERE!

SO, I have it placed exactly as it was on my GE CTC-15 clone set when I first got it, down to the mm. in placement.

My default is over the giant focus element that the 3guns go into at the end of the gun...some tubes leave it exposed, others you can peak under the dag , some have a red band and others you have to guess.

[Yamamaya42]

So, I guess I will try and touch it up this Sat, gonna have to get to it soon anyway as one of the fans I have on the back is starting to make noise and has to be lubed, most likely due to the cold.

So I'll assume the parts on the neck are correct for now.
As mentioned, the biggest pain I have with it is the nonlinearity of the R/G horz lines on the right side, always been a pain on this set.

As suggested, gonna start with vertical height and linearity, and perhaps vertical and horizontal centering if needed, before going to convergence, however my test generator has no output to do height and linearity, I do have the Digital Video Essentials DVD, and hidden deep in a horrid to navigate menu system is the right tools and screens to do so, it's just a nightmare to find it!

[Yamamaya42]

And done. aside from putting the back on the set.

http://suzaku.live-evil.org/o1ne.jpg
http://suzaku.live-evil.org/t2wo.jpg

took a while to find the right pattern, buy i did find it!

http://suzaku.live-evil.org/done-1.jpg
http://suzaku.live-evil.org/done-2.jpg

and after an hour of messing with it...

Can never get it perfect, but who can with these things?

[Penthode]

Looks pretty good to me! You did a good job on the edges.

Even the wrinkles in Jonathan Harris' face look good.

[Alex KL-1]

Inspired on things like this, is my motivation to try to experiment with my delta gun TV I mentioned.

[Yamamaya42]

One of these times I'll get around to replacing the wrong value cathode capacitor on the vertical output.
56uf (661-EKXJ201ELL560MJ2) vs the correct 50uf (75-TVA1414-E3).

Each and EVERY color set that I have seen so far, has had the same thing, a 50uf in parallel with a 5.6k 3w resistor that goes to the convergence circuit, so my error of going with the cheaper 56uf years back has to be having SOME effect on things, and perhaps why I can never get vertical height and linearity to behave quite right on the set.

I did have the right cap on hand should something major enough to make me pull the chassis on the set, but I used it in the Magnavox last year, got to get another one, I DO have 50uf 500v Radial, but that would be kinda a waste to use in a 150v circuit.

But, in the meantime, it did clean up rather well!

[old_tv_nut]

The usual wide tolerance on electrolytics means that you cannot depend on 50 vs. 56 making the difference you want, but would have to measure the cap to be sure the change is in the desired direction.

Tolerance on the part you listed is +/- 20%, so the actual value of a particular 56 uF could easily be smaller than the value of a particular 50 uF.

[Yamamaya42]

Well, every SAMS says that the Sprague TVA1414 is the correct replacement, and I did put them in the Hoffman Colorcaster and Maggie, and even the GE, and they all seemed OK, it was just the 16XL, that I goofed it up, and have yet to fix it, added to the annoyance list on the set, along with the vertical blanking fix and delay line grounding correction.

SOME DAY, something serious enough will happen to make me pull the chassis, but, as of now, not yet!