55 Westinghouse 21" B&W

[Adam]

I re-capped the whole set, all the electrolytics and the wax/paper caps have been changed. That 4mfd cap was not part of my set originally. I also checked all the tubes and replaced the weak ones. I checked all the resistance readings at the tube pins in the vert sweep / deflection circuits and the only problem was corrected by changing that 3.9k. Pin 1 of the 6SN7 reads about 20k low, I am assuming this is due to that "several resistors and caps in one" component, but I think this shouldn't be causing my problem, as it would just have to do with the vert. sync pulses from the TV signal getting to the 6SN7 and not have to do with the vert. deflection? It sounds like you have the schematic, am I even thinking about this circuit correctly, I've been reading up on vert. circuits, if I'm correct the .1 mfd cap connected to the height control and then to the grid of the vert output tube is the one that is actually charging and discharging to produce the sawtooth wave? The height control controls the rate of charging, increasing the resistance from the power source (in this case the HO trans?) to that cap, increasing the charging time, the time which the electron beam is moving downwards (not in retrace), and therefore the vert size, and the 12BH7 is just an amplifier for the sawtooth wave, already created by the time it reaches its grid. I would think the problem would be between that .1mfd cap and the vert out trans. Changing the trans. did help, the picture was 'folded over' a bit at the bottom before. I don't think the yoke is bad either, next I'm going to try changing that 2.2meg resistor betwen that cap and ground. My meter really isn't sensitive enough to measure anything less than 1meg, I'll have to wait until the end of the week when I have time to go get one though.

I have to admit that tuner problem mystifies me, if the problem is in the tuner, and can be corrected at the antenna input, why would it show up as low voltage at the cathode of the 3rd IF tube and the voltage readings seem ok before that?

Anyway, I'm in Los Angeles, CA, actually I live in the valley, I just put LA because I figured everyone would know where that is.

[Adam]

Here's the schematic of the vert. section, for anyone following this. Working on this has really made me realize that I don't know what I'm doing half the time, usually I just replace a few capacitors and maybe a tube and its up and running. Still I think I'm doing not too bad for someone who studies ancient languages, and just decided to start repairing TVs having no previous background in electronics a few years ago.

[Steve K]

Adam:

I usually replace those high resistance resistors (1 meg and above) when I redo the vertical section. Also, double check the capacitors that you replaced to make sure you put in the right values. Is that 150 mF correct? Poor linearity could be causes by a problem in the cathode circuit of the output tube.

BTW, I didn't mean for you to change your location listing on your heading! Anyway I'm just over in the Conejo Valley.

Steve

[Adam]

I checked again to make absolutely sure I didn't put a 150v 50mfd or something like that instead of the 150mfd, but I didn't. That 30mfd capacitor I had replaced with a 20, it was all I could get at 500v. But I didn't think that one being a little off would cause any problems, I just now put a 10mfd at 400v cap in parallel with it briefly, just to see if there was any change, there really wasn't. I changed that 2.2meg, and that did help a bit, after making some adjustments after it was changed, it really isn't too bad. I either have to settle for the bottom inch or so of the screen being a bit squished, or having about that much of the picture cut off at the bottom. But that's much better than it was. I think its time for me to move on, in the past 3 months I got 4 sets I have yet to start working on. And unless I'm watching a test pattern (which I have been known to do), this picture on this TV really does look good enough now.

[Adam]

I have been working on this all night, and now it is finally working well enough to make in into my rotation of daily watching sets. I replaced that big"all in one component" largely because it looked like some previous repair man had melted part of it with a soldering iron. It did nothing for the linearity, but it did improve the vertical sync on weaker channels, but what is really good is that it fixed that strange VCR / tuner problem (I don't know why or how but as soon as that was changed, it worked with the VCR without those resistors, and overall reception was improved as well. It turned out the final source of vertical linearity trouble was those magnetic rings on the back of the yoke, I went to adjust them and saw that the outer one was just loose around the crt neck. It must have happened the last time I was working on it, I couldn't get it back on there (the part of the yoke it attatches to is cardboard and it was just too worn, so I had to find where it should go and then attatch it with some tape, but that seems to work.
Oh, and Steve, the main reason I decided to change my location was that after you told me of your confusion, I thought maybe no one wanted to pick up any of the stuff I have in the TV swap board because they thought I was in Louisiana, but then its probably because nobody wants a CT-92 chassis with a bad tuner or any of the various other junk in my closet.

[John Folsom]

Adam,

I agree with Steve K. Try adjustin you AGC control, you are probably overloading the tuner/if when using the VCR. If the sound amp/discriminator tube is used as a AGC delay diode, try replacing it.

Have you replaced ALL the electrolytics in the vertical output circuitry? Sounds like the output cathode bypass may be leaky.

Regards....

[Adam]

This is a summary of what happened:

First I had changed all wax/paper and electrolytic capacitors, everywhere in the set, as well as a low voltage rectifier tube with an open filament and a weak RF amp tube and osc/mixer tube. It worked, but with bad vert. linearity, no difficulty hooking to the VCR, except it gets ch 5 on ch3 so I had to use ch. 4.

Then I changed R92, the 3.9K that only read about 2k. It did nothing for the linearity but decreased the vert. size too much, and the picture began to fold over on the bottom (it did this before, but I just had the size increased so that portion was below the screen)

I changed the vert out transformer, this increased the size and fixed the fold-over, linearity better but still bad.

At this point I wanted a strong signal, because it wouldn't sync vertically on a weaker one, so I hooked it to the VCR and found it got only a blank raster and sound. The voltage readings at the 1st and 2nd IF tubes were all ok, until the cathode of the 3rd IF which read 0 when hooked to the VCR. I had tried adjusting the AGC at this point and it didn't help. A resistor of approx. 20 ohms across the antenna terminals did, however with an antenna and not the VCR it worked better without this.

I changed the 2.2meg resistor R86, the linearity improved, but still not great.

I have a 20mfd electrolytic instead of a 30 at one end of the vert. out trans. (C2B), because I couldn't get 30 at 500v, but I put a 10mfd at 400v in parallel with it to see what would happen, and it made no noticible difference, so I removed it.

I changed that big thing with all the resistors and caps together going into the grid of the 6SN7, the vertical sync on weak stations improved, and the VCR / tuner problem went away, reception overall improved, and the picture had more contrast, no change in linearity.

I realized one of those magnetic rings around back of the yoke was loose, and I had had the horiz. width too high to compensate, the picture was way over to one side, so I had the width really high so it would fill the whole screen, with the width so high the vert linearity would only look good with a picture too big, after adjusting the rings and turning down the horiz width, the linearity now looks good.

I still get ch5 on ch3. The vert. linearity is good, not absolutely perfect, but good, actually the horiz. linearity is off a tiny bit, but not enough to be noticible. The VCR to tuner strangeness is gone. Thanks everybody for the information about this. At this point I'm really happy with the performance of this set, I have stopped messing with sets that work not as well as this, and I really don't need it to get ch3 as long as it gets ch4. I understand how my linearity problems came and went, if anybody knows what happened with the VCR, the tuner and those resistors and caps prior to the grid of the 6SN7 I would be very interested to know.

[John Folsom]

You should be able to adjust the oscillator coil on each tuner strip. Adjust it so ch 3 comes in on ch 3. Use a plastic screwdriver to adjust the slug in the coil.

[Steve D.]

Originally Posted by bgadow

Westinghouse was in the tv business up until about 1970. They had a full line of color sets, too. Saw an ad recently in a Look magazine from about 1968 showing their color console. I've never seen one, only bw.

About the time they made this set they were producing the rectangular color set using the CBS crt.

Yes, once again, you can own a brand new Westinghouse color tv. Check out their site.

Westinghouse:
http://www.westinghousedigital.com/p...27-lcd-tv.aspx

-Steve D.

[Eric H]

Hey Adam, you need this to go with the TV!

http://cgi.ebay.com/1950s-Westinghou...QQcmdZViewItem

[Phil Nelson]

Originally Posted by Eric H

Hey Adam, you need this to go with the TV!

I have one (the pencil holder, not the TV). Didn't realize they came in different colors.

Do you suppose the dealer would give you the pencil holder if you bought the TV?

[veg-o-matic]

Yours must be older, Phil. Betty Furness looks a lot younger in that picture!

veg

[Adam]

[QUOTE=Eric H]Hey Adam, you need this to go with the TV!

Thanks, I like that, but the price is too high for me, for that much I'd want another one of the TVs along with it.

[polaraman]

I just won this set off Ebay for 99 cents. I really like the looks of this set. I have to go pick it up tomorrow evening. They have the control door. It is missing the volume knob. Anybody got one?

polaraman

[Charlie]

Rich, do you happen to know the model number of the set? I have some Westinghouse knobs I can look thru... I cant really see the way they look, so maybe a model number can help if I can find it in Sams.