U-40 Serie (0.1 A Heater)

Never used / old productionAll tubes testet with uTracer o..
- Heptode / Double DiodeNever used / old productionAll tu..
- Heptode / Double DiodeNever used / old productionAll tu..
Never used / old productionAll tubes testet with uTracer o..
Never used / old productionAll tubes testet with uTracer o..
Never used / old productionAll tubes testet with uTracer o..
Power Pentode for TelevisionNever used / old productionAll..
Never used / old productionAll tubes testet with uTracer o..