Ducretet R4 (2nd Model)
Manufacturer / Brand: Ducretet (-Thomson; avant: Fernand Ducretet et Ernest Roger etc.); Paris
Valves / Tubes 4: 35, 27, 47, 80 plus voltage regulator tube
Main principle TRF with regeneration
Tuned circuits 2 AM circuit(s)
Wave bands Broadcast (MW) and Long Wave.
Power type and voltage Alternating Current supply (AC) / 110 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Material Wooden case (Mahogany)
Shape Tablemodel, high profile
Dimensions (WHD) 280 x 360 x 215 mm
Notes The R4 receiver is available in two versions:
1st model with BF connection by resistance-capacity
2nd model with LF connection by transformer
The detection is done using a triode 27 (instead of the 24 in the 1st model)
while the connection between the detector and the final lamp
is carried out by a LF transformer.
The receiver has a 0.65 A, 25/75 V regulator. It is equipped with a Thomson type 45 speaker.
Price in first year of sale 1’750.00 FRF