On Mar 5, 9:58 am, "Dave Plowman (News)" wrote:
In article . com,
wrote:

There is also a 4 digits serial number, 2xxx
Probably not too many of those about today :-)
Made in America
Rated 110 to 125 Volts 50-60 cycles 40W
Yet (strangely) was always operated from 220V.
I need to change the power cable, it is probably the original and
is crumbling in a very dangerous way, so I might get a glimps
to the internal components. It looks like a big job simply to take
the unit out from the wooden box without damaging the tuning
mechanics. I wonder if it can simply slide out or if it needs to
be lifted out (bad).

Be aware that many radios of this time were 110 volts and used the mains
cord as a dropper to obtain that from 240.

--
*Very funny Scotty, now beam down my clothes.

Dave Plowman London SW
To e-mail, change noise into sound.

Dave is 1000% corret. The line cord that is crumbling is probably in
that condition because it has gotten so hot so many times over the
years. The cord has to dissipate at least 20 watts or maybe even
twice that amount to drop the voltage down to 120 v when used on a
230V circuit..

The first thing to do is to measure the mains voltage - 230V
approximately, and then measure the voltage at the set end of that
crumbling line cord when the set is turned on and see if it measures
about 115 Volts. If so, then the line cord must not be replaced with
a regular line cord or everything in the radio will be fried beyond
repair.

The only way to salvage the radio will be to insert a fixed resistor
mounted somewhere inside the radio that will drop the voltage the same
as the original line cord is now doing. If it is possible, I would
suggest measuring the resistance of the two conductors of the line
cord, add the resistance of the two conductors together, and use a
resistor of that ohms value as the replacement for the old line cord
resistance. The wattage of the resistor will be 120V x 120V divided
by the resistance, or 14,400 divided by the resistance of the line
cord. It will be a sizeable resistor!

Once we get the power input to the radio fixed, we can then start
going through the audio stages to see what is wrong. A scope would be
nice, but I think we can measure voltages at a number of places and
get things fixed.

H. R.(Bob) Hofmann