Bill a mike step up transformer, or the active version of the D104 should
drive most anything.
A cold solder joint may not show up bad for years! We in R&D fear them for
they may work until a unit is shaken, rattled, rolled, or baked and cooled
for a long time, (years) then they start to show up. I had such on a
$100,000 tape recorder of 28 tracks. We had it 5 years, and others had it a
few more until it showed the bad joint that NEVER had been soldered, and it
was a whole bus wire going to 14 sockets! Go figure that cold joint.
Luckily, I stumbled upon it while looking for another problem! It had
gotten intermittent, but would self heal with heating cycle of the equipment
use.
Those things happen, and QC may not catch one. Next time, always look at
the solder yourself with a magnifier, and touch up any non shiny, non
filleted joint, and you may save having to send the rig in.
GL and 73,
Stuart K5KVH (That is a reasonable amount to charge for what is a very time
consuming repair to even find the things.)
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