I was given this CBS tv tonight, Just the chassis. The back was discarded so I don't know the model number. Any idea what the model number is?

The Stratford looks close.

http://www.tvhistory.tv/1956-CBS-Brochure2.JPG

From the tv history site.

jr

It does look like that is the one. Thanks!

Me Likey, no matter what it is.... Good luck gettin' 'er goin' !

Got to cleaning it a bit and looking it over today.

Sorry to see that brightener on the CRT.

yea, but I have a rejuvenator and maybe it can be restored to not need the booster. I am on the fence about bringing up the power slowly and see what it will do or just start replacing caps first.

The print for the 5C603 does not look like my tv, everything is on one board in that print. It does look close from the front but no the back. Still trying to figure out the correct model number so I can get a print for it.

The print for the 5C603 does not look like my tv, everything is on one board in that print. It does look close from the front but no the back. Still trying to figure out the correct model number so I can get a print for it.

I never saw one with that chassis layout. The ones I worked on had the upright chassis that tilted down to work on.
Their last sets were strange designs, to be sure. :thumbsdn:

Not sure why you'd want to restore the chassis when there is no cabinet or faceplate...It doesn't have a chrome chassis like some Radio Craftsmen and Scott sets.

When a Cabinet is junk and the chassis ain't shiny, I typically put it into the parts chassis pile (or line up a new cabinet).

The print for the 5C603 does not look like my tv, everything is on one board in that print. It does look close from the front but no the back. Still trying to figure out the correct model number so I can get a print for it.

What is the screen size of your set... the 603 is 24 inch, perhaps there is a similarly styled 21 inch model?
Not much help here, as there are few pictures:

http://www.tvhistory.tv/1950-59-CBS.htm

jr

Mine is a 21 inch, the picture tube is a Rogers 21ALP4A

I like the open chassis look, just going to keep it on a shelf in my garage.

I like the open chassis look, just going to keep it on a shelf in my garage.

There is technically nothing wrong with restoring a chassis only. It's educational, challenging, and visually stimulating to look at all the naked parts.:D

I like the open chassis look, just going to keep it on a shelf in my garage.

I have an RCA Secure-vision for the purpose. Possibly the last CRT set with the RCA badging. Built-in DTV tuner. :thmbsp:

I like the open chassis look, just going to keep it on a shelf in my garage.

I would be somewhat worried about the implosion hazzard of an unprotected 21 inch jug.

jr

I would be somewhat worried about the implosion hazzard of an unprotected 21 inch jug.

jr

I was worried about that on the drive home, no problem at home... No one will mess with it.

At least one member here has had a CRT in a unplugged console in a vacant room spontaneously implode...odds are it won't happen, but you probably have better odds of seeing it randomly implode than you do winning the lottery...

So, you are in Canada, then? It might be a lot different than the U.S. version.

At least one member here has had a CRT in a unplugged console in a vacant room spontaneously implode...odds are it won't happen, but you probably have better odds of seeing it randomly implode than you do winning the lottery...

In the Oelrich publications service invoice books, on one of the duplicate pages there was some kind of a release page, that the customer was supposed to sign removing the servicer from the liability of the CRT, in case of implosion. That was at the time of CRT replacement. :scratch2:
I never made one out, as it was some form of legalese???. :sigh:

In 30+ years in the TV service/repair trade, I never once ever had a CRT implode, either spontaneously or from handling.

In 30+ years in the TV service/repair trade, I never once ever had a CRT implode, either spontaneously or from handling.

Agreed. Highly unlikely.

I can't find the correct service manual for it, the one that has the correct picture on the front page does not have the correct chassis. I will have some time tomorrow and I am going to try and bring up the power slowly and see if it does anything at all. Also put the picture tube on the tester and see how it tests. If the CRT and Flyback are ok, I will start replacing all the caps and see how it goes. Would be nice to have the print for it, but I should still be able to get it going without it.

The tuner and the sound work, tuned to ch10 (My analog transmitter)
No high voltage at all. All tubes are good. Picture tube tests good, don't know why they had a booster on it, but it does not need it. While I know that old caps should be replaced, I figured I would try the reforming thing just to see what I have. I am having second thoughts of working on this without the print for it. Some of the parts are hard to identify and I don't know the test points.

With the old caps still in there, the chances of it working as-is are pretty slim. I would check all of the components in the horizontal output, oscillator, and high voltage sections to start. Do you have any test equipment? A case like this is when having an oscilloscope and B&K or Sencore analyst is a big time saver.

If it is a Canadian model, you might be able to get the service data from Just Radios.

I checked the voltage on the cathode of the damper and it was zero. Voltage on the screen of the Horz output was 67 This thing has a few resistors that are corroded and test open. One says "11" on it and the rest are unreadable. I guess I will just keep up the quest for the print. I will check with Just Radios.

I have also look at all the Beitman manuals I could find with no luck. The tubes in this set are: 12BH7A,3CB6,12BY7,3BY6,3CB6,3CB6,3BN6,4BQ7A,5J6,12 AX4,12BQ6,5AN8,12L6,6SN7,1B3GT, and 21ALP4A I think Sams 317-3 my have what I need. I am trying to find one without having to order it (I would order it if I knew for sure that it was the right one)

I checked Sams 317-3 and the tube complement is somewhat different.

Thank you, I found a list of tv's that CBS-Columbia made in the 50's. I am looking at each one on the Sam's site (you get the front page picture) when I find the correct pic, I will see about ordering that print. Thank you for checking 317-3

I am looking at each one on the Sam's site (you get the front page picture) when I find the correct pic, I will see about ordering that print.
That might not be an effective way to find it. The cover picture on the Sams is usually only one cabinet style of many sets that share the same chassis within the folder.

Also there are a lot of places to get a Photofact, the Sams website is far from the cheapest.

Ask here in the classifieds first.

.

Tim, would you have access to look at the following Sam's: 292-3, 304-2, 321-3, 334-2, 338-2 From the list i have, they and 317-3 cover all 1956 models. The reason I think it is 1956 is the picture for the 5C603 is the set I have but the 5C603 is a 24" set and mine is a 21" information I find for that does not have the correct chassis. Nothing that I have looked at has been correct so far.

Are you sure about that 5J6 mixer tube in the tuner? The 4BQ7 is a standard cascode RF amp. I looked through most of those Sam's folder's you listed and 334-2 comes closest so far. Your three piece chassis is what's strange. I'm looking through my Rider's currently.
Ed

Yes, it is a 5J6, I pulled all the tubes the other day and tested them. That three piece chassis is really strange.. in all the prints I have looked at I can't find it anywhere. Thank you again for trying to find this...

I did find a tuner in Riders 16-3 for CBS - Columbia which uses six volt filament tubes, 6BQ7 and a 6J6. Now to try and find a set with a 6BY6 / 3BY6 in it.

199-4 is a few years older but I wonder if they re-used the cabinet design. Does any one have this one to take a look? I was thinking it was 21T11, but I found Some info for that chassis in a beitman and it does not look like that is it. I found an Air King TV that looks like the tv I have.. (It is not the right chassis) but it does look like air king made tv's for CBS-Columbia. Getting closer :)

Yes, I can check those Sams but I am out of town until Thursday.

I looked in folder 199-4 , it's not right . I looked at all the Sam's 300 through 354 and found nothing that matches you tube compliment. Also checked 292. I found nothing in the Riders either. Have you been able to find any chassis numbers on the tuner or main chassis ? If you set was assembled in Canada, the schematic may not have been published in the states.
Ed

Thanks for looking, I checked over every inch on the chassis and did not find any numbers... printed or stamped. Looked at the bottom side of the wooden bottom too. Could have come from Canada, my area is a half hour drive away from Windsor.

What about part numbers on any transformers, yoke, flyback?

There is a fellow that posts over on ARF that he has Canadian TV service data. You might try posting your question over there.

https://antiqueradios.com/forums/viewtopic.php?f=3&t=292378

Here are some close up pics. No numbers on the tuner (well, tube numbers) The yoke has a number 670535 and 29-28, that orange resistor has numbers. The Vertical transformer? had 23 65 and BGH5 marked on it. The Flyback has 15A1100 stamped into it.

I asked for help from the guy that has the Canadian schematics. Thanks for the tip.

Here are some close up pics. No numbers on the tuner (well, tube numbers) The yoke has a number 670535 and 29-28, that orange resistor has numbers. The Vertical transformer? had 23 65 and BGH5 marked on it. The Flyback has 15A1100 stamped into it.

That orange thing ain't a resistor. It is a selenium rectifier...They are trouble-prone and release toxic selenium gas when they fail. Replace with a silicon diode. The numbers on the rectifier are its part number and you can look up its current and PIV rating if you have a period rectifier catalog. The plus end is the cathode (banded end of a modern diode).

The Rogers CRT reinforces the suspicion that it is Canadian.

I believe the hyphenated numbers are part numbers and the selenium rectifier even has P/N 93-75 printed on it. This is not the format used by U.S. CBS-Colombia for part number identification. In addition to what you listed, it looks like the audio output transformer is part number 23-63

Those part numbers and the 15A1100 flyback number may assist in finding the Canadian service data.

670535 on the yoke and C179540 on the rectifier are date codes. 35th and 40th week of 1955 respectively.

I was not sure what the orange thing was because it is tapped in the center. Tim, thank you for the info. Getting closer to figuring it out.

Yes, it is a 5J6, I pulled all the tubes the other day and tested them. That three piece chassis is really strange.. in all the prints I have looked at I can't find it anywhere. Thank you again for trying to find this...
With the 5J6, it's probably a 21mc IF. The 41mc tuners used different tubes.
The Admirals of the day were strange in that respect. The VHF only sets were 21mc, where the UHF/VHF models were 41mc.

I was not sure what the orange thing was because it is tapped in the center. Tim, thank you for the info. Getting closer to figuring it out.

The tap (if there is only one) means it is a dual diode. Some selenium's had several taps and acted as several diodes.

I don't see the power transformer. What numbers are printed on or stamped into it?

I don't see the power transformer. What numbers are printed on or stamped into it?

No power transformer. Series wired setup. It has a small transformer on the back side of the selenium rectifier, the vertical transformer and the audio transformer.

Thanks to RonL, the Television is a Canadian 1957 chassis # 1621
With the information he provided, I should be able to get it going.

RonL: Does your book have any other prints? The 2 that you sent don't show the connections for every connection on the tube sockets. This resistors I need to replace are not listed. I think someone replaced the 12DQ6 with a 12BQ6, because the print matches everything else.

I looked at the sam's print for that model and it is similar, but not exact. Hopefully between the 2 prints I can figure out what parts I need

I usually fix tube amps, I have done a few tv's but mainly just swapping caps. This one is going to need a lot more to get it going but it will be great when it is done.

Thank you to everyone for helping out.

Hi static.thats all the info I have.my guess is the other connections are used for tie points.this was common in the tube point to point sets.RonL