[Hallicrafters] S-40B Tuning Cap

[lrlayton at cox.net]

It shouldn't be too hard to straighten the fins, Joe. I have done this a number of times using a piece of stiff plastic or non-metallic tuning tool. The fins tend to spring back, so just carefully spread  the fins at the point where it starts to cut out until it works OK. Usually only one or two plates will need to be bent and I would start at the outside plates on each section.

You could also try inserting a piece of paper or thin cardboard between the fins to located the ones touching.  Sometimes a small metal particle will get between the plates and cause a problem, so a good cleaning also might be the answer.

I'm not sure about the S-40, but many tuning capacitors have an adjustment screw at the back of the shaft to take up play. If this is set wrong, the plates also can touch. 

Regards,
Les Layton



---- Joe Connor <joeconnor53 at yahoo.com> wrote: 
> 
> I'm fixing up this hamfest special. The tuning cap fins in the rear gang are bent, causing reception to cut out on the lowest part of the dial. I haven't been able to straighten them.
> 
> I located a replacement cap and intend to install that. Any tips or suggestions of things to watch out for? I have never had to replace a tuning cap so I'm looking for some preventive guidance!
> 
> Also, any tips on how to straighten the bent fins. I'm not adverse to repairing the current cap if that's possible. Visually, everything looks straight. However, it is shorting out on the lower part of the bank (one Band 1, it shorts out at and below 700 khz). 
> 
> As always, thanks for your help.
> 
>                             Joe Connor
> 
> 
>       
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