----- Original Message -----
Sent: Tuesday, September 21, 2004 4:48
PM
Subject: LF: PORTADYNE
Hi All.
Thanks to the response about the Portadyne radio.
Here are the answers to the questions asked.
Tech details:
4 valves
Battery leads consist of 2 leads poss
LT, 2 more for HT and a couple of others poss bias. The set is so old
that the leads have virtually disentegrated along with the internal wiring on
the chassis.
2 independent tuning condensers, each with
own knob each side of cylinderal dial on top middle of RX facia, to
left is on/off
switch and to the right is what looks like a small variometer that would
appear to interact with the loop antenna winding.
(looks like a lollipop) The dial has lost its
markings so cannot identify any anything, would not be freq or wavelength
because its so narrow. Possibly just graduations.
There is a very crude loudspeaker to the front of
cabinet and on the outside there is a screw adjustment about the centre of the
speaker for some sort of sensitivity adjustment I suppose.
The cabinet is wooden 15 inches high and 14
inches wide. The front appearance is fretted and flaired. The controls are
under a lift up pannel on top of the cabinet.
There are no coils except what appears to be a
choke type inductor and the frame aerial winding around the inside of the
cabinet.
This would be a TRF type radio with a RF stage,
top of the range in its time !!!!
I expect is must be one of the first valve type
radios and some of you old timers will know its exact age and maybe have a cct
for it.
Thanks for the 11 replies showing a lot of
interest, it probably covers MF and LF, the tuning is odd ball with both
condensers moving the dial independently.
The valve bases seem small compared to the UX5
and UX7 type but similar pin displacement.
There could be a pint or a wee whiskey for
the first one to come up with a cct diagram
The cabinet is in good condx but the chassis is
corroded but not too bad, the wiring has just about gone.
More info welcome.
de Mal/G3KEV
