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History of the manufacturer  

Senco; Addison and Chicago (IL)

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Name: Senco; Addison and Chicago (IL)    (USA)  
Abbreviation: senco
Products: Model types Others

"Senco" = "Service Instruments Company", 171 Official Road, Addison (Illinois), otherwise referenced as "Service Instruments Co." in Chicago (IL).
Manufacturer of test equipment (Multimeter, filament tester, tube tester and transistor tester etc.)

Please do not mix up with "Senco Radio Co." in New York, a company who has relabeled tubes with "SENCO".

At least in 1956 Senco sold models by "Allied Radio Corporation" catalog.


This manufacturer was suggested by Vitor Oliveira.

Some models:
Country Year Name 1st Tube Notes
USA  56 FC-4 Tube Filament Checker   Handy tester, 4 sockets, checks voltages 100-600 volts. 
USA  55 Leakage Checker LC2   Tube leakage checker, 7 tube sockets, eye tube indicator. 
USA  54 Filament Tube Checker FC2