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Contents de Radiofil magazine 44
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Ivory sheets :
Philips modèle 636A (1933) by G. Cuciuc.

Infos :
Info et divers

Restoration :
Restoration of a Ducretet "Bagneux" by C. Fouilhe.
I purchased this radio on Satur­day, October 31st, 2009 at the Emmaüs community of Béziers-Servian. During the visit of the shed reserved for the radio, hi-fi and television sets, I perceived it immediatly, rested on a shelf, as if it was waiting for me. Its outside state seemed to me good and for 25 €, it was affordable.

Realization :
A power supply for battery receiver by P. Blanco.
This power supply was developped to match with a great variety of old battery radio configurations. Contrary to the former model which was using a multi voltage winding transformer, the later is only provided with two standard transformers. The supply consists of three different parts which are isolated each other: the high voltage circuit, the heating voltage and the double polarization source.
The Electronicofil starts to transistors by G. Prieur.
The bases of the silicon transistor
In this serie of articles, after a reminder on bias and characteristics of modern silicon transistors, we shall describe simple LW-MW AM receivers built with silicon transistors for which the main concerns were to make very easy their realization by the Radiofilistes: - regenerative receivers with silicon bipolar transistors; - regeneration adjustment with potentiometer, thus avoiding uneasy coupling adjust or extra variable capacitor. - tuning with a single one section variable capacitor.

Technical doc :
The Philips 636A by D. Maignan.
Although it is still relatively current, the collectors attach a good interest to the Philips 636A. It is a receiver with direct amplification with a smart conception: this radio receiver already had an automatic gain control.

Transistors :
The parasite searcher by C. Robin.
This device is quite little known. It is the reason why we have considered interesting to do its presentation in the following lines. It has completely the structure of a transistor receiver of the sixties and allows, as its name indicates it, to search radio interferences sources. It can serve in finding an embeded pipe which would be crossed by an RF current, modulated or not. It detects, for example, the interferences generated by CPL on the short waves. Obviously, it can also be used as a simple radio receiver as well.

In the course of Web :
Au fil du forum by D. Maignan.
Grundig Boy 57E
As everybody already knows, the Radiofil forum initiated by Radiofil for all the amateurs of early radio and audio techniques, is a great place of courteous chats where participants from all countries are exchanging information about their common hobby which are always interesting. We are choosing and reproducing some files that are supposed to be of great interest to our readers, especially for those not ready to use the web yet. In this issue, I ask you to keep in mind the advices given by radio repair specialists, thus you will have useful tricks for future failure trouble shooting…

History of men :
Thus we write the history by J-C. Montagné.
Once more, Édouard Branly was manhandled. In 1902, a company of radio (Santelli and Victor Popp) announced that it would install radio stations on the cape of La Hague and at Barfleur. In reality, the sites changed. It would seem that the famous Victor Popp was more a swindler than an engineer and that he allows to use Édouard Branly’s name, without keeping this last one aware who was informed about it by Eugène Ducretet and got angry with it.

History of techniques :
The speaking chocolate by P. Charbon.
Part 2
If I tell you that the first Euro­pean gramophone using records engraved in depth was designed by a chocolate maker, you think that I am kidding. And nevertheless, it is really the truth. So, let me tell you this outstanding story.

Atelier :
A soldering iron with a preheating plug by B. Dailly.
Who was never confronted with the problem of the solders on metal boxes or shields which do not hold and which are rather stickings, because of a soldering iron the power of which is insufficient. The realization described below is worthy of interest because it will bring you a simple and economic solution.

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