Antique radios, Old Time Radios
DF904
| Country: |
Europe |
|
Brand: |
Common type Europe |
| |
Tube type: |
Vacuum Pentode RF/IF-Stage Controlling (mu) |
|
Tube ID = 3403 |
 |
| Identical to |
DF904 = 1U4
|
| Similar
Tubes |
Normally replaceable-slightly different:
5910
|
| First Series |
1951 -- Collector info (Sammler) |
|
| Base |
Miniatur-7-Pin-Base B7G, USA 1940
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 1.4 Volts / If: 0.05 Ampere / -: Direct / -: Battery = / |
| Description |
Information von Siegfried Neumann, ex Telefunken-Forschungsinstitut in Ulm: Telefunken baut die DF904 ab 1951 in Berlin - bis 1964 insgesamt 368'120 Stück. Gemäss Funktechnik Nr. 7/1952, Seite 176: Direkt geheizte Röhren für tragbare Sender/Empfänger im Kurz- und Ultrakurzwellengebiet: DF904, DF906, DL907. Die DF904 zeigt als HF-Pentode mit herausgeführtem Bremsgitter folgende Daten: S = 0,9 mA/V bei Ua = Ug2 = 90 V und Ia = 1,6 mA.
Text in other
languages (may
differ)
|
| Tube prices |
0 Tube prices (visible for members
only)
|
| Literature |
Röhren-Taschen-Tabelle 14.A, (Franzis RTT)
|
|
|
|
|
|
Patrice ZEISSLOFF
Patrice Zeissloff
|
|
Lorenz Empfänger-Röhren , 9. Auflage
Michael Sigmund
|
|
Telefunken, Spezialröhren 1962/63
Michael Schlör
|
|
|
| Usage in Models (calculation each 25th of the
month) |
1= 1953 ; 1= 1957? ; |
| Number of Models at Radiomuseum.org with
this tube (valve, valves, valvola, valvole,
válvula, lampe): 2 |
|
| No further Information
for |
DF904 |
|
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