8 Oct
2007
8 Oct
'07
8:54 p.m.
On Monday 08 October 2007 18:22, Tony Duell wrote:
An aside :
Back in the 1960s there were many live-chassis valve radios over here.
Seires stringh heaters (normally 0.1A current) and half-wave
rectification to get the HT+ line. WHich meant the chassis of the radio
was connected to one side of the mains.
Now to repair those yoy were _supposed_ to use an isolating transformer.
But most of the time you just made sure the chassis was connected to the
neutral side of the mains and carried on. One way to do that was to use
a neon-tester screwdriver and to rever the mains plug unti it didn't
light up.
Worse yet, there were apparently some of those that had the on-off switch
interrupting the connection between one side of the line and the chassis
ground. So with the switch off, you could do this test, get no indication,
and still have hazardous voltages present in the radio...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin