[Heathkit] SB-102 drive belts

[Bwana Bob]

Paul:

The original design used rubber "O" rings on all 3 shafts. Later designs 
used dial cord and a spring only on the Final Loading control. For the 
Driver/Preselector, try a number 226 "O" ring, available at better 
hardware and plumbing supply stores, and some auto parts stores.


						73,

						Bob WB2VUF

Paul Kraemer wrote:
> Working on an SB-102 which has dial cords and springs to drive the 
> preselector capacitors
> Problem is one cord was so tight it would cause the capacitor to distort 
> mechanically near the high end of the tuning range causing scratch sound in 
> receive while tuning and jumpy power output on transmit tuning.
> As the plates meshed more and the tension relaxed everything was fine.
> Did some of the SB's come out with string drive?  This is a very high sn ove 
> 15k. I thought they used rubber belts (O rings). The manual I have shows the 
> belts.
> I'm thinking of converting this to belts because lengthening that cord and 
> re-stringing it is proving to be a real challenge to my sore fingers.
> Does anyone have a size recommendation for the O rings?
> Thanks in advance
> Paul K0UYA 
> 
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