Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 3515
Brand: Valvo GmbH, Radioröhrenfabrik; Hamburg
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to U4100D = DG4101 = REN704d = E441 = E441N
Similar Tubes
Heater different:
  REN1817d ; U1718D
First year 1929 Tube leaflet collection E.Erb Analysis by original leaflets
Successor Tubes 1933   E448   RENS1224   X4122  

Base Europe 5-Pin , B5 + side contact (Codex=Fa)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Predecessors: none, Successors / Nachfolger: E448, RENS1224, X4122
By its construction this tube is a space-charging-grid tetrode, but should be used as self oscillating frequency converter. The oscillator feedback is applied to grid 1, the input signal to grid 2. Its amplification is low and not to control, the oscillator voltage is closely coupled to the input circuit.

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
  U4100D: Rundfk. Rö. Ratheiser
Wolfgang Holtmann
U4100D: Collection Patrice ZEISSLOFF
Patrice Zeissloff

U4100D: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

U4100D: Valvo Daten Heft 1930
Trev Levick

from Just Qvigstad

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]