[Hammarlund] SP-600 JX17 rewiring

[Bill]

As for the wires, I've slipped heat shrink tubing over initial sections
if the rest of the wire is ok, otherwise
I've replaced the whole wire.

www.jamminpower.com


----- Original Message ----- 


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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