[Hammarlund] SP-600 rebuild

[Richard Knoppow]

    Let me second this. Also about the tuning cap. Do not bend 
the plates even though they are slotted they were never meant to 
be bent. However, the alignment of the stators with the rotors is 
important. The stators are clamped in place with screws and fiber 
washers. They must be exactly centered in the rotor. I have used 
feeler blades to hold the stator centered. I think when people 
bend plates its often because the stators have drifted away from 
being centered and exactly parallel.
    Dial calibration is given in some military handbooks as 
0.25%. This is very good but the actual dial accuracy is actually 
better. I also found a trick for getting the moving pointer to be 
exactly vertical, which it should be. It should be adjusted so it 
comes just to the line for each band. The calibration marks will 
then appear to be extensions of the rifle sight pointer.
    Since you have already replaced the caps this advice is late 
but the best are polypropylene plastic film caps. They are far 
better than the original paper caps and the ceramic caps used in 
older rebuilds. There is no particular reason to replace the 
ceramic caps unless you find a bad one.

On 9/12/2020 12:09 PM, Charles Ochs wrote:
> Note that it is VERY IMPORTANT That the band switch be placed in a position between the detents BEFORE the RF strip is removed. Failure to do this will result in just the kind of damage that you have reported.
> Likewise, for re-assembly.
> Chuck
> N1LNH
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL