On 2026-04-30 23:23, Tim via users wrote:
Tim:
We had a noisy mike cable in a studio. The plastic (or whatever it
was) was too soft, so it would easily deform (outer shield would get
closer to inner core) and change it's capacitance when moved. If you
banged the cable it would put a loud "CRACK!" into the signal. One of
the weirdest faults I'd diagnosed.
I've had the same problem with Neumann condenser mic in the 60's. It was
the one with sub-miniature valves in the pre-amplifier, way before
transistors. We used the mic in the band and the cable basically precluded
any singer's dance moves :-)
Optical audio cabling has helped a lot, it does mean the end of ground
loops, but when you eventually have to go back to analogue I find a lot
of things are self noisy. Such as the whine from multiplexing in
various display panels in equipment gets into their audio, quite badly.
Our first CD player did that. TVs do that, getting into their audio, I
have one you just can't listen to it wearing headphones.
I've had an original Cream LP in the early 70's that had 50Hz hum recorded
in it. The song would end and the hum would become obvious. Then the hum
would end in the between-the-songs gap, it would start again and a second
or two later the song would start, masking the hum. And as I say, it was
not some pirate copy, it was the official release. Studio recording, not live.
Cheers
Frank
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