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I don't recall what the voltage was on black and white TVs.
Probably somewhere in the range of 10K - 15K volts. Early color
TVs could be as high as 25K volts. Aquadag is the term for the
metal coating on the inside of CRTs. High positive voltage is
applied to it to bleed off all the electrons being shot at the
screen. In those days we called the high voltage circuit and
whatever voltage as just "aquadag".
bp
<part15sbs{at}gmail{dot}com>
On 7/20/2019 7:38 PM, Chuck McCown
wrote:
Yeahbut, they all did it, especially the color TVs. I
presume aquadag is autocorrect for Anode.
Sent: Saturday, July 20, 2019 5:18 PM
Subject: Re: [AFMUG] OT 50 years ago
The aquadag HV on early TVs was a common source of
problems. Get a little dust on the top of the TV's cathode
tube, and you'd get these periodic "snap!" sounds when it
would discharge through the dust.
bp
<part15sbs{at}gmail{dot}com>
It was TV of the mind. I didn’t want to risk
going into the house on the off chance that the
B&W TV would actually work. It was terribly
flakey. Had some kind of HV problem where it would
go very dark after a few minutes.
So I stuck to the radio.
Sent: Saturday, July 20, 2019 1:16
PM
Subject: Re: [AFMUG] OT 50 years ago
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