Dan,
having eliminated pinched wires, you now need to use a magnifying glass and
a high intensity light and inspect any solder joints in the most likely
circuits to cause this problem. After touching up any suspect joints, then
widen your inspection and remediation, if the problem reappears.
Also inspect components for any with stress leads separating from the body
of the component, (at crazy angles, leads too short to have any slack before
a terminal connection, etc.).
Even Ten Tec bench might not find an intermittent.
If you double box rigs, and pad with several inches of foam pads, and use a
box rated for the weight, you should be able to safely ship any rig. You
must use good tape, such as glass filament tape to close the seams and place
around the closed box as additional reinforcing straps. Now that the
summer season is closing, and shippers are not using summer student helpers
who may be careless with heavy items, you have even more reassurance that
the rig will ship well, if you don't find the problem(s). Be alert that it
may be more than one bad solder joint in a certain circuit.
I well remember an expensive scientific Ampex recorder I had where a whole
row of terminals for every preamp card, (14) were not soldered. Likely
because someone knocked off for lunch, or a break and forgot where they left
off soldering.
Good Luck and 73,
Stuart Rohre
K5KVH
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