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  • #10816

    Peter Heembrock
    CVRS Member

    I just acquired a Silver Marshall radio circa 1930?…the cabinet is in really good shape but there is no model number…only a serial number. I think this was an American company based out of Chicago however the tag shows it as being a Canadian radio…the escutcheon on the front of the radio shows the name “Duchess”. It has 8 tubes. Does anyone have any more info on this since I am looking for a schematic or service info etc…

    Peter H

    #10822

    garykuster
    CVRS Member

    Some info can be found at the Radiomuseum site. here’s a link…

    https://www.radiomuseum.org/m/silver_usa_en_1.html

    #10826

    Gerry O’Hara
    CVRS Member

    See page 1076 in this issue of Radio News for info about McMurdo Silver, who’s first radio company was Silver Marshall.

    • This reply was modified 3 months, 1 week ago by  Gerry O'Hara.
    #10829

    Peter Heembrock
    CVRS Member

    Thanks for the link to that fascinating article about McMurdo Silver. It is interesting to read about companies like this that began in the 1920’s and were innovators yet struggled during the depression…some recovering and most not.
    I am still trying to sort out when the Duchess model I have was made…made even more difficult since it apparently was made in Canada?
    I have had no luck at all locating this model name. I have gone through every model on Nosatlgia Air with no luck. Radiomuseum does not have anything related to this model either…everything I come across is made in the USA. For now I will keep this one in a safe place and get to it later…I may just leave it as is if it is mostly original inside…the cabinet is untouched and original.

    #10838

    Gerry O’Hara
    CVRS Member

    Hi Peter. Yes, the Silver-Marshall company dissolved in 1932, and McMurdo then quickly set up a new radio company, McMurdo Silver Inc. By late-1932, he introduced the first of a line of high-end receivers, the ‘Masterpiece’ (MP) – to some extent competing with Scott. This line eventually included six models, each building on the technical advancements of the previous, culminating in the MP VI in 1937, followed by a couple of related lower-cost offerings. The receivers were manufactured by either Hallicrafters or Howard and then inspected, set-up and aligned at McMurdo’s own ‘radio laboratory’. I have an MPVI – articles on this can be found on the SPARC website here and here. The second article provides a brief description of each of the Masterpiece models. I will see if I can find any info on the SM ‘Duchess’ model.

    • This reply was modified 3 months, 1 week ago by  Gerry O'Hara.
    #10840

    Gerry O’Hara
    CVRS Member

    Hi again Peter. Your ‘Duchess’ may be the name of the cabinet or model. The chassis was likely identified separately. Your radio looks to be a single (Broadcast) band model with power supply integrated with the tuner chassis. The RCC index for 1930-33 lists 15 Canadian-made Silver Marshall models. Two of these are battery sets (Models 34A and 35A), one is described as an ‘Automobile Radio’, and one as a ‘Midget superhet’ (Model 782-16), so this eliminates 4 of the 15. Your chassis appears to be either an 8 or 9 tube model, depending on whether the socket next to the large can capacitor at the rear of the chassis is a (rectifier?) tube socket or speaker wire socket. This further reduces the possibilities. If you could confirm the tube count and types of tubes/how many of each, that would help identify whether your chassis is amongst those in the RCC index.

    • This reply was modified 3 months, 1 week ago by  Gerry O'Hara.
    #10844

    Peter Heembrock
    CVRS Member

    Hi Gerry,
    It is an 8 tube chassis with a 4 pin speaker plug..most of the schematics I have found indicate a 5 pin speaker plug with very few models having a 4 pin speaker plug. The tubes are lined up in a single row and I have not found any chassis layout diagram similar to this. I only had time to verify the rectifier tube as an 80…I can look at the other tubes this weekend to see if I can make out any markings or tube numbers on them ( they are quite dirty ).
    PH

    #10846

    garykuster
    CVRS Member

    I think your radio is basically a SM-60 B. Here’s a link to the Radiomuseum site. The tube count and type looks to be the same as yours, but you would have to pull and identify more tubes, but the 80 shows up. Looks like only minor differences on the cabinet.
    https://www.radiomuseum.org/r/silver_60b.html

    Hope it helps, Gary

    p.s. Just looked again and it’s only a 7 tube chassis. Close, but no cigar.

    #10847

    Peter Heembrock
    CVRS Member

    Hi Gary,

    I just pulled the tubes to check the numbers and from left to right ( as per the photo ) they are:
    80, 45, 45, 56, 224, 224, 224, 24A
    The link you sent for the SM-60B is a close match but that model only has 7 tubes in total…mine has 8 ( an extra 24A )…so I can certainly use this for reference and a starting point.
    The model I have also has a phono input terminal ( two pins )…

    Thanks

    PH

    #10848

    John Greenland
    CVRS Member

    Hi Peter

    I notice on the radio museum site it references the Riders set of manuals for info on the Silver Marshall radios. Volume 1 has numerous models shown in it.

    If you have already checked it out, then sorry to have bothered you , but if not, Volume 1 is here — http://silverslingshot.com/pdftry/Vol_01.pdf

    regards

    John G. VO1 CAT

    #10850

    Peter Heembrock
    CVRS Member

    Hi John,

    Thanks for pointing me to the Riders Vol 1…I have had a quick look in there and no luck…the key differences in the model I have are:
    it has a phono input ( 2 pin plug on top of chassis at rear )
    tubes are in a straight line
    speaker plug is 4 pins…ll of the SM radios I have looked at have 5 pins for the speaker socket.
    The escutcheon has the name Duchess embossed on it…

    It does appear to be a variant of the SM-60B with an additional RF amplifier stage added at the front end…
    I think I can move forward with this and the biggest issue is that this is a Canadian variant…made in Toronto…

    PH

    #10851

    Peter Heembrock
    CVRS Member

    Close up of the escutcheon….

    PH

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