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ID = 37948
United States of America (USA)
Brand: Philco, Philadelphia Stg. Batt. Co.; USA
Tube type:  Transistor   Audio Frequency 
Identical to 2N2428 = 2N2429
Similar Tubes
Normally replaceable-slightly different:
  AC122 ; AC125 ; AC126 ; AC151

Base Wires
Filament Solid State
Description Material/Aufbau/Pol.: Germanium/Diffusion PNP;
Form/Case/Outline: TO-1;
Daten/ I F: __ mA; U F: _ V; Isp: __ µA; ß (beta): 50-150; N: __ mW; Imax(Ic): 100 mA; Umax(Uce): -32 V; f g(FT): __ MHz; tmax j: __ °C.
Vergleichstyp: 2N1191...94.
Dimensions (WHD)
incl. pins / tip
6 x 10 x mm / 0.24 x 0.39 x inch
Weight 2 g / 0.07 oz
Information source -- Schematic   TVT 1978 ECA
  2N2428: Sams Photofact Folders Date 5-65, Set 754, Folder 9
Egon Penker
2N2428: TVT 73
Günther Stabe † 19.8.20


Usage in Models 1= 1964? ; 3= 1964 ; 5= 1965?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):9

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