[BC] 110 V DC AC/DC radios 5 tube all american

[Dennis Cope]

They had a diode across the on/off switch which, when off, supplied DC to
the CRT filament to keep it hot.

Dennis


-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net]On Behalf Of Kevin Tekel
Sent: Sunday, December 03, 2006 16:42
To: broadcast at radiolists.net
Subject: [BC] 110 V DC AC/DC radios 5 tube all american


Cowboy wrote:
> I'm still amazed that such unsafe junk was ever sold at all.

Don't forget the "instant-on" TV sets which kept the tube filaments
glowing even when switched off.

Of course, nowadays virtally all electronic appliances have "soft"
on/off switches, and a good portion of their circuitry remains active
even when shut off.  I have a Sharp bookshelf stereo whose entire
AM/FM tuner board remains powered up and active all the time -- not
just when you're playing CDs or tapes, but even when the entire
stereo is shut off.

This creates huge headaches for hams and DXers because sometimes
these electronic devices create even more RFI when they are switched
off, than when they are on!  (And whatever happened to Part 15?  My
laptop's power supply "brick" puts out RFI that has better coverage
of the neighborhood on the AM band than my 100 mW AM transmitter!)





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