Viewing 8 posts - 1 through 8 (of 8 total)
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  • #15396
    Bruce Morgenstern
    CVRS Member

    CHISHOLM MODEL 369 RADIO;
    I am trying to repair the work previously attempted on this chassis and a schematic would be very helpful. If anyone knows where a schematic could be obtained would be greatly appreciated.
    Bruce

    #15397
    garykuster
    CVRS Member

    Couldn’t find much, but here’s some background. Small world, My former shop( German Motor Car) was also located on Murray st. In Port Moody. There is a link to some schematics at the end of the article. Perhaps getting in touch with SPARC would help, but I’m unsure if they’re open during the Pandemic.

    Gary

    #15400
    Bruce Morgenstern
    CVRS Member

    Hi Gary
    Thank you for the e-mail and help it is really appreciated.
    I looked up your service shop, German Motor Car, and it shows you had a great reputation and really satisfied cliental .
    From car repair to radio restoration is a 180 degree turn.
    The models of the Chisholm on the site you sent were not for the model 369 but there was a schematic for the model 540 which has the exact tube line up but a different placement on the chassis.
    This schematic will be just great for what I want.
    Thank you again and have a great day.
    Bruce

    #15401
    garykuster
    CVRS Member

    Glad to help. One of the authors of the article is Gerry O’Hara who is one of the main dudes here on this site. I’ve read a lot of the back articles that he hs written.. I’m retired now in Montreal and I really miss the shop and the customers! Radio repair made more sense as I now have something to play with during the long cold winter. Have fun with the project!
    Regards, Gary

    • This reply was modified 2 weeks, 3 days ago by garykuster.
    #15404
    Jean Marcotte
    Forum Participant

    Bruce, on the schematic of the 540 there is a missing connection between the 6SQ7 plate and C14.

    #15406
    Gerry O’Hara
    Keymaster

    Hi Bruce,
    I have a lot of info on Chisholm Industries (a short article I wrote several years ago after I interviewed Jim Chisholm is attached to this post), but, unfortunately not many schematics (only Models 540 and 910) – most did not seem to survive closure of the company in the 1960’s. The good news is that many of their radio models used similar and rather basic circuits, so it should not be too difficult to ‘reverse engineer’ one of their chassis sufficient to get it working ok.
    Let me know if I can help in any way.
    Gerry

    • This reply was modified 2 weeks, 1 day ago by Gerry O'Hara.
    #15455
    Bruce Morgenstern
    CVRS Member

    Hi Jean & Gerry, sorry I didn’t reply to your posts sooner.
    Jean, I know the missing connection will help me.

    Gerry, Thank you for the offer of help, schematics, and information.

    The Chisholm radio Model 369 was given to me from a friend who is a tube collector and seller, in Wenatchee, Washington. He got this radio included in a purchase of tubes and gave it to me. The radio looked in pretty bad shape and I was actually thinking of throwing it away until doing some research I came across your article, Gerry. Reading that it was manufactured in Vancouver made me take another look at it. I came to the conclusion the cabinet was sound but would needed a complete refinish, which can be done.

    It was then time to look at the chassis and I thought I would just plug it into the variac and very slowly increase the voltage. I didn’t get the voltage turned very high until smoke was coming out of the transformer. Well what I found was astonishing and here is just a start of what I found; The original transformer was changed to a transformer that did not have a 5 volt winding only a center tapped high Voltage winding and a 6.3 volt winding. They then tried to replace the 5Y4 tube with 5U4 tube. The High voltage wires were connected to the filament terminals with gobs of solder flowing over one terminal to another. At this point I stopped as there was more and more of the same.

    I have decided to repair the chassis using the Chisholm 540-530 schematic as it looks very close to what I believe this radio is.

    Gerry, I am sure I will be back asking you for help as I go along.

    Thanks, guy’s.
    Bruce

    #15456
    Gerry O’Hara
    Keymaster

    Yikes! – sounds like someone really butchered that chassis!

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