Did you try adjusting the verticle height/linerity controls? I had a set once that I thought had a faulty part in the vert circuits, and after going thru everything, it turned out that the controls were simply turned all the way to one side. I felt pretty stupid after making that discovery, but I bet it happens often.

it doesnt have a vertical linerity control, at least I cant spot it.

Also, the sync/clipper circuits arnt functioning either.

I can lock the vertical and horizontal to one scene, but if the scene changes, or the brightness of teh picture changes in the scene or if the picture starts to move like in a commercial, it will loose lock. horiz lock is worse than the vert.

I think that clipper circuit failed, because I pulled out the clipper tube, before the string of tubes started to fade out (wired in series). no change in picture. The sync circuit has problems. and the sound is absent.

I know ive kinda been running on and on and on with this thread, and it is probably misleading.


I am sorta treating it like my blog. But, go ahead and ignore everything above this point:

The set is in now working order, the sync is locked, the sound is preasent, and the picture is on the CRT.

The problem I cannot seem to be able to figure out is the focus is sorta bad, and the linerity is very very bad.

The tuner happened to be on CSPAN lastnight, and dick cheney had a very bad case of the coneheads.

Also, I checked the (2) 4.7megohm resistors between the two .005s at the vertical output plates, they check fine, but I replaced them anyway. The two 1megohm resistors off of the focus pot test within tolerance.

The 2.2meg series resistors on the focus pot test fine also.

I dunno what the deal is.

I checked the (4) 10megohm resistors around the vertical output section, they all test perfect.

I dunno what to do now. Its weird. Unless one of my HV .005s are already bad. I dunno. I can center the picture. but the linerity is horrible, and the focus is somewhat bad.

Help. I may need a new batch of .005s

On those electrostatic sets I often replace a lot of the resistors over 1 meg especially in the sweep and HV circuits. Your vertical problems could be caused by one of the mmf caps being bad. Also, recheck the caps that you replaced, it is not hard to put in a .001 when it should be a .01 or something like that.

Steve

I have no idea how to test an MMF cap.

I have a Capacitor checker on my DMM. thats it.

Don't test capacitors, just cut or unsolder one end and solder tack a new one in if you do not want to replace it right away. I'll have to dig out a schematic of your set to let you know which ones might be causing your problem.
Steve

I have the schematics of my set as a jpg file.

Its a TS-4D

If you want me to post them, or email them to you, I will do so.

I sent you a PM.
Steve

you also have a PM

Pictures are worth a 1000 words! See for yourself what my problem was.

The sync issue was a bad 25mmf cap.

I noticed most of the MMF caps are wax/plastic caps.

and #2 :puke:

and last but not least, picture #3.

That is the actual picture you see. Actual focus.

The picture looks almost exactly the same on the face of the CRT, but its not to scale ;)


the two 4.7megohms on the plates of the vertical circuit have been replaced, but they didnt make a difference. all the high megohm resistors are well within tolerance. couple of them read exactly 10megohms.

Did you use Ceramic disc caps to replace the 6000v in the vertical circuit? That will cause this type of problem in these sets. They seem to work OK in the horiz position tho.

Check the vertical pots for continuity from end to end also, not sure how they are used in this set but I had a Hallicrafters with that problem and it was an open pot.

Steve K told me that the reason I dont have a vertical linerity control, because each plate has the exact same waveform, but its inverse from each other, and for some reason its not the same on mine.

No, I dont have ceramic caps on the vertical stage. just the horizontal stage.

I have big brown caps on the vertical stage. There old, they were already in the set, and they test fine with no leakage. So, I used them. I dont have the money to purchase anything from allied, and they can shove that minimum fee up thier a**.

First, I thought one of those are bad, but I removed each one from circuit, and left the other in. Vice Versa, they both affected the picture when either one was removed. If i remove them both, there isnt any sweep.

So the caps are good, and I did a capacitor check on them through my DMM, and they test alright. There isnt any leakage.

I'm still suspicious of those caps, they could be breaking down under high voltage.

PM me with your address and I'll send you a couple new ones.

Eric

Look at the waveforms on the two grids of the 6SL7. Do they look the same, but inverted (same amplitude, slope)?

The second half of the 6SL7 gets its signal from the plate of the first half, through C57, C142, R117, R58, C58 and R57. If any of these parts is bad it will result in an improper waveform on the grid of the second section, and therefore bad linearity.

you do have a point there.

ill get right on it.


Eric also mentioned that the HV caps could be breaking down under load. He probably is right.

These are NOS caps.

OK. I took pictures of the Oscilloscope.

The first picture here is the probe clipped to grid on pin 1:

This is the Oscilloscope picture of the probe clipped to grid pin 4.

I dont know if its my eyes, but the P-P isnt too great as the first one.

The first one looks mighty strong and healthy. The second one, its hard to tell.

Dont ask about my oscilloscope, and why it looks that way.

I took the faceplate and scale off, because the CRT is weak, and you can hardly see the trace through it.

If you didn't change the scope sensitivity between pictures, then it looks like the amplitude of the second trace is about 1/2 of the first. Check or replace the components I mentioned in my last post. You should have the same amplitude on each grid.

I didnt do anything to the scope.

I adjusted it according to the first wave, and just removed the wire, and put it on the second one. Didnt touch any controls.

well, the 100k resistor reads about 114k.

the 220k resistors reads about 264k.

the 100mmf cap is a huge one, and I dunno where to get one like that. its dark in the middle from heat.

How about the .004? Have you changed it? Any 100 mmf 600 v cap should work for C57. The resistors are close enough.

the .004 has been changed, and I changed the 220k to be sure, it didnt hardly make a difference, so the only thing left is the heat scorched looking 100mmf. Its a long cap that looks like a resistor.

the cap tests at 170pf on the DMM

MMF means PF I think

where am I going to find a 100pf at 600vdc?

wait........


you know what, After close inspection to the schematic and the actual point to point wiring, the .1mf between the .05, and the pin 6, or the cathod of the second side. IS MISSING.

its not in the chassis.

I wonder if its supposed to be there, or its just plain missing. That might cause this.

other words. C-56 isnt in the chassis.

DOH!

I found it. its between the plate of the OSC tube, and the ground.

sheesh.

It should be there. Try putting it in. That could solve your problem.

I said I found it. I found it over at the osc stage.


so, the only thing left is the 100mmf cap.

its an oblong cap that is crusty and almost black in the middle from age and use. its the long cap that sits right under the VO tube socket.

it reads as follows: .170 nf

on the dmm. is it bad? Thats the only thing left. the paperwax caps have been replaced the resistors have been checked and replaced.

oops forgot picture:

BTW. Disreguard the paper caps. Theyve all been replaced. along with the black ones you see.

I suspect that the 100 pf is OK, so before you mess with it, try this:

Take out the 1B3 so you have no high voltage. Then you can look at the waveforms directly on the the deflection plates of the CRT. See if they are about the same amplitude. If they are, I'm stumped. Maybe the CRT has something wrong with it.

If they are not the same aplitude, remove the two .005 coupling capacitors from the plates of the 6SL7 and swap them. See if the distortion changes. It is possible that you have a bad capacitor from Allied.

As I understood it the 6000v caps are NOS but still quite old, Is that correct?

Mike, I will send you a couple of fresh .005@6000v caps to try.

Meanwhile you could do as Steve suggests and switch those caps around and see what happens.

A word of to the wise Mike, if you have to choose between my advice and Steve McVoys go with his :p:

I am just a humble parts changer for the most part while he is the wizard.

Eric

...

He's already changed those caps, scroll back up to the post with the photo and read it again.

Hurry up and fix this thing already, this is like watching a soap opera! LOL

Anthony

LOL. it is. Its driving me nutso.

ALL OF THE PAPER CAPS have been replaced. ALL OF THEM.


Yes, there NOS. There not from allied, I DO NOT want to buy from allied, they can shove thier 25 dolla minimum up thier a**

That 100pf has to be good, becuase it has no deflection at all, when I pull it out of circuit.

If the vertical stage would just work already, I would close this project with a job well done, and it be over.

But thats not how the wheel turns.

uhhh.

I cant check the waveform if there is no HV

there is none. Heres why:

The vert output gets its B+ from the HV supply.

Any ideas?

id say the .005 are breaking down under HV.

I did switch them, the picture didnt change.

There is also a big huge aluminum can that is rated .005 at 6000vdc I havent changed yet, because I dont have a replacement for it yet.

according to the schematic, it looks like a bypass cap, it has to work or there wouldnt be any HV.

I replaced some out of tolerance 4.7meg resistors on the deflection plates.


one of the 4.7meg resistors was around 8.6meg in the vertical stage. I replaced that.

another 4.7megohm in the horizontal stage was about 30megohms. Does that look out of tolerance? LOL

that solved the focus problem, and the picture is better centered. but no result on the linerity.

after replacing some bad resistors