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Contents de Radiofil magazine 41
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Ivory sheets :
Machine à cylindres Échophone (1898)

Restoration :
Un Pizon-Bros Sky Master by J-P. Hervé.
The Sky master is provided with not only long waves and medium waves but also with six short waves bands for overseas long distance receiving. It is intended to operate as a portable receiver with 12 volts (for tube heating) and 90 volts (for plate voltage) battery cells.

Realization :
Building the tube tester FC2010 by C. Fabert.
Part 1
This tube tester allows to measure the characteristics of the vacuum tubes as in operating conditions. No need of special transformers to build this project. It uses standard Metrix U61 tube tester’s tables whose user manual is available on the net. You may also use the excellent Combix program (free) which is available at the following address: http://pagesperso-orange.fr/convoi/radiotsf/combix.htm
Des tubes 6K7 à transistors pour le récepteur BC312 by J. Mahieux.
6K7 with transistors
Retired since a lot of time, I was getting bored, so I had to find a new project. I decided to “transistorise” a tube receiver, without spoiling its operation at all. It should continue to normally operate with my circuits. As I am a radio ham, I naturally choosed a BC312 with octal tubes.
Un émetteur original by J. Cornu.
Adapté de celui décrit dans l’Encyclopédie Pratique de la Radio
I am a radio hobbyist since I am 17 years old, in 1954. I remember that I built a kit of a regenerative receiver and also several valve audio amplifiers.

Technical doc :
The Heathkit IP-17 high voltage power supply by C. Robin.
This article describes a product sold by Heathkit in the sixties. Obviously the kit is not available anymore, but the schematic diagram of this power supply can still be used as a basis to build a lab power supply useful for repairing, to test a tube rig, or for a tube receiver without a built-in supply. This power supply only uses parts still easy to find nowadays.

Retro press :
Looking for the lost Audion by E. Aisberg, M. Pirat.
While reading with a great interest a Toute la Radio issue of september 1947, the manager of which was the well known Eugène Aisberg, author of La radio? Mais c’est très simple, I found out an article titled “ A tube has disappeared ” whose text is given below.

In the course of Web :
Au fil du forum by D. Maignan.
Les ficelles de cadran, salutations, dépannage d'un RA93A, bobine d'excitation sous le châssis
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.

History of techniques :
Qui a inventé l'antenne? by J-C. Montagné.
En préalable, qu’est-ce qu’une antenne ? D’après le dictionnaire étymologique Larousse le mot viendrait du latin antenna qui signifie vergue. Comme on le sait la vergue est un terme de marine qui désigne une longue pièce de bois disposée en travers du mât d’un navire pour soutenir la voile. Le terme a été appliqué à partir du 15e siècle aux appendices tactiles des insectes et à la radio à la fin du 19e siècle

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