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Contents du Bulletin de l'AEA série normale 104
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Ivory sheets :
Sonora Sonorette 855C
Sonora Sonorette 855D by J.-C. Montagné.

History of techniques :
La première expérience publique française de radiovision by R. Berthélémy.
In april 1931, the French scientist René Barthélemy, who studied television in the Compagnie des Compteurs de montrouge, near Paris, organized a public demonstration of his device. Transmission and reception were mechanical. We are indebted to J. Poinsignon – who worked with R. Barthélemy – for the text entirely writted by R Barthélemy and for the pictures. Please, refer to old issues of AEA bulletin n° 50, 52, 55, 57, 58, 59, 61 et 62.
Utilisation des triodes-hexodes dans les petits postes by D. Falgoux.
Triodes-hexodes are widely found in receivers. However, in some of them a UCH42 is used as a regenerative detector (triode) and LF preamplifier (hexode). The internal connexion between the two parts of this kind of valve is not an obstacle for good working in HF and LF, simultaneously.

Report :
Le lampe-maître by J.-C. Montagné.
A report at Marcel Beaujean house. Our colleague remarke 1919 TM triodes. He has equiped an entire workshop with a lathe for blowing glass bulbs, the required vacuum pumps and HF heating of electrodes to improve gaz evacuation.

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