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ID = 50669
Tube type:  Full-Wave Vacuum Rectifier 
Identical to KX-280 = AC80 = 80 = KX-80 = 280 = CX380 = UX280 = KX80

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 5 Volts / If 2 Ampere / Direct
Description Japan; Matsushita / National. 
Text in other languages (may differ)
Information source -- Collector info (Sammler)   

kx280_so.png KX-280
Anonymous 10 Collector

Just Qvigstad
Usage in Models 4= 1933?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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