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Contents of the magazine
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Contents de Radiofil magazine 87
<< Previous July-August 2018 Next >>
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Ivory sheets :
Le récepteur Lincoln modèle 60 de 1935 by Serge Logez.

Life of the club :
Radiofil à la Maison de la Radio by Daniel Maignan.
Considérée comme une construction majeure de l’architecture contemporaine et depuis cette année inscrite aux Monuments historiques, la maison de la Radio est située au 116 avenue du Président-Kennedy dans le 16e arrondissement de Paris. C’est un ensemble aussi appelé maison de Radio France qui a été conçu par l’architecte Henry Bernard pour la radio-télévision publique française. Elle fut inaugurée le 14 décembre 1963 par Charles de Gaulle, président de la République, en présence d’André Malraux, ministre d’État chargé des Affaires culturelles. À l’occasion de l’exposition « Mai 68 à l’ORTF », Philippe Sourdon avait aimablement lancé une invitation aux membres sur le forum de notre association pour une visite informelle de ces lieux emblématiques.

Restoration :
Membrane des haut-parleurs : Comment remplacer la suspension ? by Jean Gadreau.
The part which is most often defective in a Hi-Fi loudspeaker is the cone mounting. It’s life­span is around twenty years depending on use and exposure of the cabinet to UV. Replacing the loudspeaker is costly and, after twenty years, the model will have become impossible to find. Fitting a model with similar characteristics is not a good solution because, with each type of loudspeaker having unique parameters, it is impossible to maintain the characteristics of the original cabinet. It is preferable to replace only the defective mounting. Changing the loudspeaker mounting is not very difficult. The financial impact, compared to the price of a loudspeaker, is negligible. Implementing the process described in the following should give complete success.

Realization :
Le ASB 1 : analyseur de signature basique by Gérard Delorme.
Testeur expérimental de composants ou d’ensembles électroniques
There follows a study which I have carried out over the last few months concerning a signature analyser, handy for fault-finding, which I’d like to share with Radiofil… We remember TP (Practical Work) classes in schools and technical colleges, where we created nice Lissa­jous figures on an oscilloscope screen… For that, we cut the timebase (horizontal sweep) and replaced it by a signal to the X input phase shifted relative to the Y input (labelled vertical), to vary the appearance of the figures. The process described below proposes again using the X input of an oscilloscope with a very simple test setup, to make a basic « signature analyser ».
Le Némodyne by Jacques Hildebert.
En fouillant dans mes archives, j’ai retrouvé quelques photos du super poste à galène que le capitaine Némo aurait utilisé lors dans ses voyages à bord du Nautilus. J’en ai fait une réplique.

In the course of Web :
Au fil du forum by Serge Logez.
Série batteries (cinq réalisations de Roland Boudon RFL-5331)
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 subject of the discussion relates to the fabrication, using modern means, of copies of radio batteries from the 20’s/ 30’s.

History of techniques :
Le Ducretet A5 by Camel Belhacene.
It’s a radio unlike any other. The model A5 from 1925, according to Eugene Ducretet himself, comes « in a shape a bit different from the “ piano ” receivers ». Indeed the overall shape does somewhat remind us of this musical instrument and the famous receivers of the same name. Several significant modifications have been introduced. The part corresponding to the keyboard is no longer horizontal but inclined at 30 degrees like a pulpit.
Le Vitaphone by Denis Vernizeau.
Talking pictures is a vast subject. I had written an article two years ago on the Vitaphone process, first talking picture process used between 1926 and 1929 by Warner Bros, before being swept aside by the optical route. It must be noted that this process used a 33rpm record, which therefore does not date from the 50’s as everyone thinks !
Les instruments de musique électroniques by Tony Luzy.
À l’orée du xxe siècle. La transmission de la musique à distance par fil.
We can’t turn the page on the 19th century once and for all without giving a final salute to some lesser-known inventors from the first half of the century. As in many disciplines, if certain inventors have risen above the rest, leaving their mark well documented in the scientific and technical literature (and today on the Web), and occasionally leaving us some prototypes, many in Europe and the USA rode on the currents of thought of the time and led research and experimentation on similar subjects, sometimes in the shadows, with more or less success, results and fame. The list could be long and we could not be exhaustive.

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