Home Forums Electronics Restoration Sparton with ONLY push button tuning??????

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  • #24528
    Dan Walker
    CVRS Member

    I bought this Spartan console , model 10240. I have taken it out of the cabinet and I find that there is nothing to tune in stations other
    than the five push buttons.
    Usually there is a gear system or a stringing system to change stations.
    I have never seen a radio like this one.
    How would someone go to a station that was not set up with the push buttons
    I also have another Sparton console with the same configuration.it is a model 6340.
    The close up photos are of the 6340 model [which is exactly that same tuning capacitor].
    Do you guys have any information about this type of tuning?
    Dan in calgary

    #24534
    Steve
    Forum Participant

    Hi Dan – In the factory manual it is shown as a “Swing Dial” – on the layout diagram , and on the schematic – it has semi-circular lines where the tuning capacitors are shown – I’ve never worked on one – but I assume ? that tuning is accomplished manually by pushing on the dial with your fingers ? just a guess at this point. – similar to some other units with turret tuning – but without a dial string.
    I’ve seen a few of those at club auctions and on Kijiji – so there must be a few guys around that have worked on them.

    • This reply was modified 1 year, 2 months ago by Steve.
    #24536
    Dan Walker
    CVRS Member

    Thanks for your input Steve;
    I do find it kind of weird that you would have to put your fingers on the celluloid
    dial in order to change stations.
    Dan in Calgary

    #24537
    Steve
    Forum Participant

    I agree – do you have any pics with the chassis out of the cabinet ?

    #24538
    Ralph Spracklin
    Forum Participant

    Dan
    I am not certain, but it seems you are still locked in “Push Button Mode”. To get out of that Push Button Mode, you must depressit or Pull out on that tuning Knob again to return to regular tuning with the Knob. That is somehow, how it works. They were not thinking of you when they designrd this.
    Regards
    Ralph

    #24539
    Ralph Spracklin
    Forum Participant

    Hey Dan and all
    I think that tuning Knob is in-line with the shaft on the Tuning Condenser itselt. Being spring loaded, depressing it causes the Clutch to engage or disengage from the shaft on the tuning condenser. It’s kind of a Push Button, spring loaded, clutched Direct Drive. That’s my story for now and for now I am sticking to it.

    Ralph

    #24540
    Dan Walker
    CVRS Member

    There is no push button mode on this radio.
    I will get out to the garage a little later today and take some photos of the underside of the chassis.
    There is nothing connected to the tuning caps.
    photos coming later
    Dan in Calgary

    #24542
    Dan Walker
    CVRS Member

    Here are some photos of the underside of the chassis. As you can see there is nothing connected to the tuning cap.

    I guess it is made that way,but a very poor design.
    Dan in Calgary.

    #24550
    Ralph Spracklin
    Forum Participant

    Hello Guys
    Dan, I have done a lot of reseach on this set of yours.
    It seems that the secret to this “PUSH PULL TUNING DIAL” Knob is that it is job of that Fourth knob which is the one located on the front of Cabinet to the far Right of the knob line-up. Its got to be one of those four knobs. I think it has to be that fourth knob which ever one it is. And for some reason it is not mentioned on the Pacific Data Sheet for your Model 10240. This has to be the Push Pull Knob we are looking for. Maybe it is frozen or possibly just spins freely until one pulls out on it???
    I have not been able to find any other pictures of your actual chassis on-line. But I was able to find your model on Pacific. See below.
    This complete setup as stated by Steve is called “Swing Dial or Swing Tuning”. It was promoted by Sparton as “SELECTRONNE TUNING” And yes it does have a dial string mechasim, but it is clutch operated. And maybe, if you have already removed the chassis from its Cabinet, and while pulling off that knob, you may have already released the clutch????

    http://pacifictv.ca/schematics/sparton10140data.pdf

    Ralph

    #24553
    Dan Walker
    CVRS Member

    Sorry Ralph, there is nothing behind the knobs to adjust anything [that I can see.].
    The knobs are [ on/off, volume] [ tone] [band switch] and [ radio/phono.]

    If you look at the photos you can see that the only knobs that are there are those four, and none of them are push/pull.
    The radio is in the garage , but tomorrow I will bring it in and take some more photos.
    I appreciate you looking into it , and it has me baffled,so far.

    Dan in Calgary

    • This reply was modified 1 year, 2 months ago by Dan Walker. Reason: grammer
    #24555
    Ralph Spracklin
    Forum Participant

    Dan
    I don’t give up easily! Seeing how they called this setup the “Swing Dial” Maybe by just rolling the top ring of the Dial Face with your thumb that whole top ring, the whole Dial Face, would Swing/Turn, with the help of a smaller gear which aids in the turning of the tuning codenser. Also, the actual dial face/drum, on which Station Numbering is printed also seems to say that this whole Dial drum must swing in both directions. I would suppse they called it “Swing Dial” for this reason, as it swings from Left to Right. If it does not turn, maybe it is frozen/seized. From one of the pics you have posted I can make out a portion of that dial drum atop the Tuning Condensr. In other words it is the Dial Drum with its Lettering which turns. Rather than having an indicator, usually attached to a string, which moves. Also on your particular set I do not see a large pulley wheel as I see on other “Selectronne Models” Maybe my mind is running wild again, But there has to be a logical answer to this. Also as push Buttons are usually used to tune AM Stations, how else would one tune Short Wave???

    Ralph

    #24558
    Dan Walker
    CVRS Member

    Well here are the photos.
    There is nothing to tun in the stations other than the push buttons.
    The dial drum does rotate on the shaft, and the shaft goes straight down to the tuning cap.
    There is a bulb behind the dial and when you go to Short Wave the bulb moves up and down it light up which band you are on.
    I have looked everywhere and you would have to use your hand to turn the dial, as it does turn quite freely.
    When you turn the dial by hand, it is connected[by a gear] to the tuning cap and it rotates.
    You would tune short wave the same way once the band switch is turned to Short Wave

    I can see how it works quite easily. but I still think they [SPARTON] could have made a better system
    By the way, all the tubes check out OK and the chassis has not been messed with . I was told that it works
    Dan in Calgary

    #24569
    Ralph Spracklin
    Forum Participant

    Hi Dan
    So if I am correct you are saying that by turnng that Dial Drum you can now tune stations, both AM and S/Wave, that once you get the radio up and running, this Drum setup will work. I suppose for those who owned these sets in the beginning. it was what it was, and they lived with. It should be a nice set once you get it working. Looks clean enough underneath.
    Regards
    Ralph

    #24572
    Dan Walker
    CVRS Member

    I have recapped the radio and it works quite well. I set up the push buttons for some of the local stations.

    To tune in the other local stations i have to turn the dial by hand.
    I am not going to try to align the radio as there is no definite dial that can be set EXACTLY on a certain frequency.
    It is as good as it is going to get.
    Here are the photos
    Dan

    #24592
    Steve
    Forum Participant

    ” I am not going to try to align the radio as there is no definite dial that can be set EXACTLY on a certain frequency.”

    Hard to tell from your pics – but it looks like it uses a shadow to indicate the tuned freq ? maybe not focused enough ?
    that should aid in alignment .
    do you have the alignment instructions ? I have the Sparton manual if you need them .

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