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Contents de Radiofil magazine 88
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Ivory sheets :
Le poste Marquett 63 by Serge Marinier.

Letters of radiofillists :
Courrier des radiofilistes

Restoration :
Restauration Vulcain by Fernand Maton.
I found this radio in a sale for the modest sum of 10 Euros, complete and apparently in good condition, with some old 78’s as a bonus. But the set wasn’t working. Safety being paramount, it shouldn’t be powered up before carrying out some electrical investigation, tests and verification and given a thorough cleaning. The presence of a partial logo stuck on the bottom left of the front indicated its make, with a serial number engraved on the chassis.
Réfection des cadrans by Victor Cordoba.
This article doesn’t claim to present all the techniques and tips that can be used in the restoration of our vintage radios. It’s inspired by tips found here and there, particularly with Hubert Frappier’s method for opaquing which is necessary in some cases and for which you need to obtain flowers of sulphur which is readily available in DIY stores (be careful : it irritates the inside of the nose : to be handled with caution).
Un petit récepteur des Éts Leclerc de 1926 by Serge Logez.
It’s a lovely little regenerative receiver from 1926, well built, equipped with 3 valves, and measuring 35 x 20 x 18 cm. A quick look shows that a lot of work will be needed to restore the cabinet and it’s clear that the cabling has been tampered with, since some wires were missing.

Realization :
L’Électronicofil met en œuvre des modules économiques by Gérard Prieur.
Construction d'une alimentation
Many electronics hobbyists want semiconductor circuits to be easily added to their electronic tube systems. They are faced with the needs of a low voltage (for example 12 volts), regulated and able to provide a few hundred milliamperes. Modules of all kinds are available for sale on the web at prices that defy european competition. The power supply of the filaments is generally carried out by an AC voltage of 6,3 volts and we will realize, with one of these modules, a stabilized power supply giving an adjustable voltage of 9 to 20 volts up to more than 200 mA.

Measurement :
L'impédance des transformateurs de sortie
We put too much importance on the absolute value of the impedance presented by the primary of output transformers. Far from us the thought that this is a secondary factor. But we often believe, wrongly, that an impedance mismatch adversely affects the music quality, when in reality a bad match primarily reduces the output power. Too low a value in the anode circuit can equally increase anode dissipation and shorten the life of the valve.

In the course of Web :
Au fil du forum by Serge Logez.
Un poste à deux lampes
As most of you know, the Radiofil forum, which is open to all vintage radio and audio enthusiasts, is a hub of good natured discussion and exchange and therefore an invaluable source of information, with regular participation from other countries. We select subjects which we believe will be of great interest to our readers and publish them in the magazine, with particular consideration for those who don’t have Internet. In this edition the discussion focusses on the assembly of a direct amplification (trf) radio using a minimum of components, based on circuits of radios from the 20’s/ 30’s.

History of men :
Ducretet en Belgique by Bruno Brasseur.
Belgium is a little country, we may say a little wedged between his great neighbors, Great-Britain, France and Germany (still today Belgians are called friendly « those little Belgians »). Because of this circumstance, his history of the radiotelegraphy and radiotelephony before de WW1 is badly known by his neighbors. Nevertheless, before this war, the Belgians reached a high level : during 1907-1908 already wireless telegraphy, at 1913 wireless contact with the Belgian Congo (more than 6.000 km) and at 1914 a regular broadcast with music, heard at the Eiffel tower… And this before the use of radio valves ! But we now shall see what also happened at the beginning of the previous century.

History of techniques :
Les instruments de musique électroniques by Tony Luzy.
La première décennie du xxe siècle
In the previous installment, we looked at inventions from the precursors of electronic music and the concepts at the heart of the development of the Telharmonium (or Dynamophone) by Thaddeus Cahill. Let’s now start on the description and the history of the instrument itself.

Report :
Comme en 40 by Alain Caupène.
This article is about the event organised for the second year by a small village in the Haute-Vienne, Saint-Junien-les-Combes (200 inhabitants). It’s unlikely you’ve heard of it. To place it, let’s say that we are at the doors of Bellac, one of two sub-prefectures of the area and birthplace of Jean Giradoux who wrote the play L’Apollon de Bellac in 1942, which takes us back to the time of the Second World War and the radios of the SOE (Special Operations Executive — a British secret service which operated during the Second World War).

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