Jim, both the 1A3 and the 1R4 are hardly cantidates for consumer portable
use since they draw 150mA on the filament even though it is at 1.4V, so I do
agree that your suggested uses are quite correct.
I think I am correct in that the pair of diodes used for FM detection need
to be fairly close in parameters to work properly, so could one even use one
of the above tubes along with the diode in a 1U5, for example??

Neil S.

"Jim Mueller" wrote in message
...
1A3 (miniature) and 1R4 (loctal), although I suspect they were used mostly
in military 2-way FM radios.

--
Jim Mueller

To get my real email address, replace wrongname with eportiz. Then
replace nospam with sacbeemail.

"Neil S" wrote in message
news:wl8ji.15024$Io4.12763@edtnps89...
Jim, if you find out anything, or you delve into the circuit on this set,
I would really like to know how they did the detector for FM. Since
isolated cathode diodes are almost unknown in battery heated versions,
did they use crystal rectifiers?

Neil S.

"James Pernal" wrote in message
...
I'm trying to ID this Lorenz battery and AC AM-FM portable. Tube lineup
as found DC 90, DF96, IR5 DK91, DF96, DF97, DAF96, and 3V4 DL94.

As you can see no labels. US version is the only label. Not in
Beitmans,Nostalgiair. Radiomuseum (non-member) and other European
sources imply its tube lineup is close to a 56, but this does not have
LW or SW. The 55 does not have the DC90 converter horizontal underneath
the variable cap.

Any ideas? Unique model for US?

Thanks Jim