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ID = 19730
Brand: Tesla; Praha, Bratislava etc.
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Pentagrid-Converter (Heptode)   Frequency converter 
Identical to 1H33 = 1R5SF = EP203
Similar Tubes
Heater different:
  1H34 ; 1R5 ; 1R5T ; DK91

Base Miniatur-7-Pin-Base B7G, USA 1940
Was used by Radio/TV-reception etc.
Filament Vf 1.4 Volts / If 0.025 Ampere / Direct / Battery =

Ua 90V, Ug3 -0.5V, Ug2+4 67.5V, Ug1 -0.5V, Ia 3.2 mA, Ig2+4 4 mA, Sg1/g2+g4 > 0.45 mA/V, Ri > 250 kOhm

Dimensions (WHD)
incl. pins / tip
19 x 49 x mm / 0.75 x 1.93 x inch

595_3.png 1H33: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
1H33: data-sheet
Anonymous 15 Collector

Usage in Models 1= 1951 ; 1= 1954?? ; 1= 1957 ; 2= 1958

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of



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