From: Watson 'Atto Parsec' Name
Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
X-Newsreader: MicroPlanet Gravity v2.60
Date: Mon, 9 Dec 2002 19:55:07 -0800
NNTP-Posting-Date: Mon, 09 Dec 2002 21:00:52 PST
Organization: InReach Internet
In article ,
> I read in sci.electronics.design that Watson 'Atto Parsec' Name
> wrote (in ach.net>) about 'audio line specifications', on Sat, 7 Dec 2002:
> >Hey, look. This was back in the toob (aka valve) days, when the tape
> >recorder's microphone was a box the size of a carton of cigarettes, and
> >the microphone cables were covered with cloth braid. I don't even think
> >they had an idea of using PVC, the dielectric was probably rubber.
> Well, they started like that, but crystal mic s were still around in the
> early 60s, with PVC-insulated screened cables.
> >Back in those days, every budding audiophile like myself had their heart
> >set on getting a Shure or ElectroVoice cardioid microphone, so they
> >could make a decent sounding recording. But those were way out of my
> >budget. I couldn'e even afford the matching transformer.
> In UK, we wanted STC 'ball and biscuit' omnis. We had to settle for
> 4021C ex-service, which STC would not repair.
When I got my first tape recorder it was before they came up with the
word Hi Fi. The TR was all tubes, and I made a few mods to it. I
decided that I wanted to moni the recording so I put an earphone jack on
the chassis. That's when I found out about inductance. I disconnected
the secondary from the speaker and when I tapped on the mic, I could see
the spark between the pins on the tube socket! I guess this was back in
the days before they used neg feedback. The single-ended 6V6 was just
going into cutoff and SNAP! A couple kV between the pins.
Almost all consumer TRs used ceramic or crystal mics. And 15 or 20 feet
of extension cable made a lot of difference on the high end of the mic's
response. Later the companies started importing magnetic mics and I got
something that sounded a lot more decent than the tinny ceramic or xtal
mics. And I could put a longer extension cable on it without adverse
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you put NOSPAM in the
Subject: line. alondra101 hotmail.com
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Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html