though I suspect this was long before XLR connectors were common..
The Cannon plug/Cannon connector was invented by James H Cannon
prior to 1950. The rubber insulated version (XLR) was first produced
in 1955 ... per:
<https://en.wikipedia.org/wiki/XLR_connector>
The XLR was all over the place in AV installations well prior to
the 1970s ... I was quite familiar with them in school AV settings
by that time. They were certainly in universal use in broadcast
and recording studios by the mid 70's when I started in there -
given that the facilities were 10 or more years old, I would bet
the facility used to record Tubular Bells was almost entirely
XLR connectors.
73,
... Joe, W4TV
On 4/25/2023 7:23 AM, g4piq via Amps wrote:
Interesting discussion which reminded me of reading about a rather
remarkable case of RFI into a professional audio system.
In 1972 Mike Oldfield recorded Tubular Bells at a studio about 40 miles
from the Rugby 16 kHz VLF transmitter running c. 500kW. If you attach an
SDR to the audio from a good quality copy of Tubular Bells (e.g. CD) -
you can read the CW being sent.
No originality claimed - details at GBR in Tubular Bells - 16 Khz makes
it onto CD who wudda thunk!? : r/amateurradio (reddit.com)
<https://www.reddit.com/r/amateurradio/comments/7or56a/gbr_in_tubular_bells_16_khz_makes_it_onto_cd_who/> - but rather cool I thought! Clearly someone needed to learn about pin 1 problems - though I suspect this was long before XLR connectors were common..
73,
Andy, G4PIQ
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