Used to get this problem with speaker distortion on occasion when repairing
TVs in the early 1960's, usually at a remote farmhouse three days camel ride
from base. Found the easiest method was to remove the speaker and stand it on
the magnet with the cone facing you. Carefully work the cone with both hands
to equalise the pressure, backwards and forwards towards the magnet feeling
for the voice coil rubbing. If there was a problem it was sometimes possible
to warp the speaker frame to re-center the voice coil as a temporary fix. As a
matter of procedure the speaker was replaced at a later date when a spare
became available as the problem could re-occur.
Unlike the problem with the Elecraft speakers where it looks like the damage
may be caused by rough handling in transit, these speakers failed after a
period in service possibly due to excessive temperature or humidity. Elecraft
could have to review the packing of these speakers for transit if the amount
of damaged units becomes a problem.
Bob, G3VVT
K2 #4168
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