RM5 Engels

Superheterodyne "radiomodulateur". In the same year the four valve RM4 and the six valve RM6 were introduced. Walnut cabinet with black aluminium front. Original valves for this set given in the documentation are: R43, R15 or 6/100^e, R36D or 6/100^e, R50 or CL104 (or R15 or 6/100^e). A R43M bigrille is still available.

Data

Valves

Serial number:	1319
Dimensions (w×h×d):	38 x 34 x 30 cm
Made in:	1926
Purchased in:	2006

	Click on a valve for more information
	Circuit

Interior

Left, the chassis as it was when I bought the radio. The crooked rectangular object beneath the upper spindle is suspect and clearly not original. It is in fact a "Wireless" combined leak resistor (2M) / capacitor (200 pF) . In its place a capacitor like the one to the left has to be placed, combined with a 2M resistor that has to be placed on the other side of the chassis. The crooked transformer (below, left) is a Lemouzy type transformer, this transformer was removed and replaced by an original Ducretet transformer (right picture).

The restored chassis. L.f. transformer, condenser and leak resistor (not visible) were replaced.

Back

Interior

The horizontal wooden brace behind the metal front was missing. In the middle of this this brace, there is a brass snap connection for the lid. The brace was replaced by a new one with the lower half of the original Ducretet snap connection. This work was done by furniture restorer Wiego Bergsma, Utrecht. For use with a frame antenna, the left coil has to be removed and replaced by a special plug.

Coils

Radiospire No 48R (200/700 m) and transformateur No. 225T came with the radio. Transformateur 225T (long wave) can not be used together with Radiospire 48R. Coils 70T and 48R, shown above, are a better combination.

Bottom

Radio stamp and serial number

Picture from a Ducretet advertisement

This page was last edited on 08.11.2011