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ID = 8687
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Triode-Heptode 
Identical to TH233
Similar Tubes
Normally replaceable-slightly different:

Base Octal-8 GB, (Mazda), K8B, MO (Codex=Vb)
Filament Vf 23 Volts / If 0.2 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
TH233: G.Fausto Balestra
Gian-Fausto Balestra

TH233: Telefunken Werkstattbuch
Wolfgang Bauer

TH233: original data sheet
Bernd Staginnus

from Just Qvigstad

Usage in Models 5= 1939 ; 3= 1940 ; 2= 1945 ; 4= 1946 ; 7= 1947 ; 1= 1948

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):22

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