• Year
  • 1930 ??
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 287376

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); ZF/IF 55 kHz; 1 AF stage(s)
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 4 & 40 & 60 & 80 & 120 & negative bias Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Supradyne à 5 lampes - Gamma, Éts., Georges Gavoret &
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 360 x 230 x 105 mm / 14.2 x 9.1 x 4.1 inch
  • Notes
  • Instructions de montage / kit assembly instructions, "Supradyne Gamma à 5 lampes".

    Publié par / published by Ing. I. C. FLOREA, "Toate Tainele Radiofoniei" ("Tous les Secrets de la Radiophonie" / "All the Secrets of Radiophony"), Bucharest 1930.

  • Literature/Schematics (1)
  • Ing. I. C. FLOREA "Toate Tainele Radiofoniei", p.288-290

 Collections | Museums | Literature


The model Supradyne à 5 lampes is part of the collections of the following members.


Forum contributions about this model: Gamma, Éts., Georges: Supradyne à 5 lampes

Threads: 1 | Posts: 1


        The study of the screen grid valve (§51) emphasized the advantages to be gained by its employment in the intermediate frequency stages. The present set – a very interesting achievement - puts this in practice: Although using before detection two valves with a very high gain, the size of the set is very small, due to a carefully designed screening. The circuit diagram (fig. 208) shows a common frequency-mixer-receiver employing a two-grid valve (bigrille) in the first stage:

Fig.209 shows the wiring and components on the vertical panel:

Fig. 210 shows the same on the horizontal panel:

        The set’s sensitivity reaches the upper limit, due to the employment of the two screen-grid valves as intermediate frequency amplifiers, and especially to the careful screening, allowing maximum amplification without the risk of self-oscillation. Also due to the employment of the screen grid valves, the high selectivity, common to every super-heterodyne, is here sensibly enhanced.

Following parts are needed to assembly the set:

1 "GAMMA" filter transformer.

2 "GAMMA" intermediate frequency transformers, type 1620.

1 "GAMMA" combined oscillator, 200 - 2000 m.

1 ebonite panel 36 × 23 cm.

2 slow-motion 500 cm variable capacitors.

1 rheostat 6 - 10 ohms.

1 potentiometer 400 ohms.

1 fix capacitor 3000 cm (loudspeaker).

1 resistor 3 Megohms (grid leak).

1 low frequency transformer ratio 1: 3.

Connection wire, screws, banana sockets power supply cord.


[The publicity section of the book contains at page 298 an advert from one of the main radio-parts supplier in Bucharest in those times: “RADIO-MATERIAL NICOLAE SARU” offering the complete set of components for the kit:]

The valves could be chosen from the following list:



Pitagora-Petru Schorsch, 17.Jan.17

Weitere Posts (1) zu diesem Thema.