Question about Audio & Video Receivers

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I have a Saalburg 5380 C 1964 radio. The tuning dial does not work. When i open the back and have a look it apears that the shaft from the tuning dial which controls the tuning capacitor(Trimmer) must be damaged. The capacitor vanes do not move. They are not stuck but the shaft is not turning them. I think i will have to remove the transparent wheel and examine the shaft but how on earth do i do this? There are two cords distributed from this wheel. Please help.

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  • vincent39 Nov 06, 2008

    Finally fixed the cords ok after a struggle. But the drive shaft to the tuning capacitor is still a problem. The grub screw holding the plastic wheel to the shaft(and also therefore allowing the shaft to be turned) is scraping around the shaft diameter and not holding the wheel. I have really tightened this grub screw but it still does not turn the tuning vanes! I am niot sure how to proceed. I suppose I could remove trhe grub screw and try and drill a hole thro the shaft and insert a machined bolt?

    I will have to remove the tuning capacitor to the bench to do this and there are at least two wires attached to the capacitor. Or is it simply that the vane and shaft neeed lubricating? I notice that the top half of the capacitor is clear plastic. Can I remove this?

    Regards

    Vincent Kennedy

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Robo
Has just solved 95% of my radio problem!
Brilliant to finally hear from a professional. I still have minor problem with the shaft on the tuning capacitor buy i am working on this
Thank you again for your assistance
Vincent Kennedy

Posted on Nov 06, 2008

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Hi

So you have a slipping dial pointer/tuner drive on your vintage radio. It will be old age catching up with it for sure:) The shaft may have dried grease in its bushings seizing slightly, or more likely, the dial drive cord has lost its "grip". They do stretch over the years. I recall as an apprentice having to do every faulty dial cord that came into the workshop, until we got a new apprentice that is :)

Best bet, BEFORE YOU START doing anything, even if the cord is broken, make a hand drawn diagram of exactly how the cord runs. You may be able to find one that matches up to your radio here, Short of that(as well as), take closeup photos from several angles.

Once you are confident you have an understandable diagram of how it is strung, you can proceed to mess with it.

I have to be honest, completely replacing the cord is what I found to be the quickest/most reliable way to repair them, but then I had plenty of practice in the end. If you don't have the correct type of dial cord string, then repairs can be a fiddly, but effective option to attempt.

First you need to determine if the cord is failing/stretched, or if there is a stiff bearing point. This takes a bit of hands on approach to determine. put some additional tension into the cord by pressing down on it and see if the drive improves. If it does, then you may be able to apply more tension into the drive by shortening it a little. Do this by carefully unhooking one of the retaining springs that secure an end, without removing the chord from the spring, retie the another loop knot(as many as you need to before there is no more room to do so) onto the spring to use up some cord shortening it. Apply a dab of nail varnish to any knot once secure to be sure that it does not come undone. You can just cut the knot away and retie if you wish also, just fiddly with the limited amount of string you have to work with. It often does not take much to re-tension it. Sometimes it may be as easy as fitting the spring to another tighter hook point on the large pulley(if you are lucky) This can be about the time when you are thankful you made a diagram of the way the cord is strung,as things can get messy.

If it appears that the tuning gang is seized, then a drop of penetrating oil to the bush will help it. Work it back and forwards a little to work the oil in. The large pulley attached to the tuning gang can be removed here also if you wish to work on the gang. use some tape to secure the string in place to the pulley and it can generally be removed from the gang and secured back onto the chassis somewhere, whilst keeping tension on the string. Check also the free running of any brass pulleys along the drive. It is imperative that you don't get any oil onto the cord itself or the drive surfaces of the pulleys. ... or you will need to replace the whole thing. A syringe is the best applicator of oil for these jobs. Lubricate sparingly and as a last resort only.

Worst case, you may need to completely restring the drive anyways. I did suggest that at the start.

Good luck with your dial drive repair. If you need new cord, it can be purchased from a vintage radio restorer online or just take it to a vintage repair shop in someones back shed in your neighborhood :)


regards
robotek

Posted on Nov 06, 2008

  • Graeme Ross
    Graeme Ross Nov 06, 2008

    Excellent Vincent. Glad to have helped out. No chance of an upgrade with your rating to FixYa. The rating system is pretty tough to get ahead on, and a Helpful actual detracts from my overall rating. I did(and always will) put a big effort in for you:) Cheers



    regards

    robotek

  • Graeme Ross
    Graeme Ross Nov 07, 2008

    Hi Vincent



    The tuning gang should not be difficult to move. It will have dried grease in the bushes supporting the shaft. if you can get penetrating oil to make its way into the the bearing, then it should cure the problem. Cleaning out the dried grease once you have some easy movement back into the gang may allow for operation into the future. Taking the pulley off to do this work is advisable in the manner I indicated earlier. Using a solvent like acetone, or alcohol to help break down the hardened grease may also help. Be careful of plastic parts with acetone also, it can melt alot of things :) Be wary of over tightening the screw into the collet of the plastic pulley. It may split or damage it beyond repair.



    regards

    robotek

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