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ID = 10277
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Developer: Mazda = Valve (Tube) brand GB (see also France) 
Tube type:  Vacuum Pentode   RF/IF-Stage 
  Ca. 1925 up to 1945 rare.
Identical to SP41 = VT150_GPO = CV1699 = VR65A
Similar Tubes
Normally replaceable-slightly different:
  CV1335 ; CV1574 ; CV1700 ; VT150A_GPO
Heater different:
  ARP36 ; CV118 ; SP61 ; VR65 ; VT200
Successor Tubes CV1065  

Base Octal-8 GB, (Mazda), K8B, MO (Codex=Vf) Top contact with a cap.
Filament Vf 4 Volts / If 0.95 Ampere / Indirect / Parallel, (AC/DC)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Brans, P.H. Radio Schema's, Antwerpen
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
  SP41: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
SP41: My collection
Jose Antonio Gonzalez-Ruiz

SP41: Telefunken Werkstattbuch
Wolfgang Bauer

SP41: Madzda Infoblatt
Daniel Consales

from Just Qvigstad

Usage in Models 2= 1938 ; 9= 1939 ; 1= 1940 ; 1= 1945 ; 2= 1946 ; 2= 1947? ; 3= 1948 ; 1= 1949 ; 1= 1950

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

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