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Dear Mal and All,
a
hint about your PORTADYNE:
Let us say, the offset pin of the base is 1, and
the others - clockwise - 2,3,4. The distance pin1 / 2 is 13mm, 2 / 3 is 10mm, 3
/ 4 is 10mm, 4 / 1 is 13mm.
If yes,
then this is the base mostly used in the twenties and early
thirties.
Often used valves were: RE 074n ( n means neutro,
although a triode, it does not oszillate, when used in the hf-amplifier
)
As detektor ( audion ) RE 084, first audio RE 034,
speaker RE 114 or others. All types by TELEFUNKEN, VALVO had comparable types,
like A408 instead of RE 084. Heater 4V battery powered ( pins 2 and 4 ). Pin 1
is anode, pin 3 is grid.
I am sure, there are similar types by Cossor,
Mullard, Ediswan and others.
I have a radio with the valves described above,
built 1926 by Siemens, still working. It contains MF and LF. Two separate
condensers and two knobs for tuning. And I have a french militairy low power
transceiver built 1936 with the TM 2, it has the same base. The RE 084 works
there, too.
73 Walter
Hi All
Has anyone ever heard of a vintage radio called a
PORTADYNE. Radio maybe 90 - 100 years old. It has 4 valves, which are missing.
Unusual valve bases 4 pin with one pin offset, bases look small. It has a loop
antenna wound around the inside of the cabinet. It has a rotary base plate to
swivel the radio for best reception. The case is the usual polished
wood.
Any help appreciated for restoration work, cct
etc or original box !!
73 de Mal/G3KEV
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