[Hammarlund] SP-600 JX17 rewiring

[Tisha Hayes]

Has anyone had the problem where the cloth covered wiring running from the
front panel, into the under-deck has cracked, revealing bare conductors?

How about the lack of a bushing on the chassis penetrations from the front
panel to the same area on the right and left? I have unlaced the harness in
the area of the front panel and threaded heat-shrink tubing on each
conductor. But now I see that a significant number of cloth covered wires in
the under-chassis are brittle with cracks in the insulation.

I have seriously considered replacing all of the wire on the under-chassis
with teflon coated wire. If I go that far I would install shielded wiring
for the inter-stage wiring and to the bandwidth switch assembly.

The previous restorer replaced all of the capacitor using the "clip the
leads, form a loop and loop in a new component" technique. The soldering
technique is sloppy with many solder connections having the granulated look
(insufficient heat or rosin, or soldering to a conformally coated
connection). I prefer teflon tubing on all component leads.

The radio works fine except for no BFO operation (I will figure that out). I
plan on making several component value changes to improve audio linearity
and frequency response.

I have already redone the power supply section and knocked the ripple on the
B+ line down to around 15 mVAC. Thank goodness the turret modules and small
long, narrow sub-deck where the antenna connection attaches to has had it's
caps changed.

Any opinions or suggestions out there? Has anyone accomplished a lower deck
rewire?

Tisha
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