[Hammarlund] SP-600 tuning problems

[James A. (Andy) Moorer]

  Yeah - disassemble the entire tuning mechanism - take everything off - 
and clean the daylights out of it.

When it is fully disassembled, you should be able to rotate the main 
capacitor shaft with two fingers. If you can't, that is the problem, and 
that one is harder to fix (press-fit bearings). Hopefully, the capacitor 
itself will rotate smoothly and a good cleaning of the entire gear train 
will work wonders.
-A

On 11/20/2011 10:32 AM, Joe Connor wrote:
> Thanks for all your advice.
>   
> My tuning problem is a bit different than I first thought. As I played with the set today and tuned the set manually (by turning the tuning dial), the tuning is very, very stiff. Given that drag, it's no wonder the rollers would not work properly.
>   
> I assume the answer is to pull the front panel and see what's going on with the tuning. The field manual gives exploded diagrams, which should help.
>   
> Has anyone experienced this type of very stiff tuning? It's so stiff that it's actually difficult to turn the dial by hand. Any tips or suggestions?
>   
> As always, thanks.
>
>