Made by
Societé des Etablissements
Péricaud (SEP), Paris. 1st stage:
triple grid (trigrille, DARIO R69) oscillator and mixer,
2nd stage: another trigrille, (most probably another
(Cyrnos) R69) triple grid intermediate frequency amplifier, 3rd stage:
triode (R78?, now A410) grid leak detector, 4th stage:
pentode (DARIO R79) audio amplifier.
"Transformateur" with switch (GO/PO). Wooden case with blue
linen cover and black metal front. The original price
was 700 Francs.
More about
the R69 trigrille
As far as I know,
this Dario tube has only been made for a few years, with a
rather dubious 1st grid. The tube has four pins and two
extra pins at the side, one extra for the extra first
grid and one for the 3rd grid. The extra grid G1
(connected to a positive voltage) was supposed to give
some extra emission by reducing the space charge. Péricaud used these valves in some of its
Trisodyne models as some sort of unique selling stunt,
but in fact is was all humbug, and production stopped
after a year... To overcome replacement problems, the
valves could in most cases be substituted by a normal
"bigrille" without loss of functionality (Not
in case of the first R69). Of course,
with some modifications, even a simple triode can be
used as a Tropadyne Mixer/Oscillator.
Listen to "Amour De
Gitane", by Jean
Vaissade (acc), "Jiango Renard" (g), Francesco Cariolato
(xyl),
recorded in Paris in June 1928
Inside
The antenna coil (left) is missing.
Chassis
From left to right: lf transformer, tuning capacitor,
by-pass condenser, 2nd
intermediate frequency
transformer, volume control, antenna capacitor, 1st
intermediate frequency
transformer.
Advertisement in Le Haut Parleur October 28, 1928
"Transformateur"
with switch (MW/LW)
oscillator coil
Advertisement for the Trisodyne
radios made by Péricaud
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