Tube-tester in strong suitcase, ready to use. This device is new and guaranteed for 1 year Allows testing of all common audio / radio tubes, power tubes, valves and magic eye included. Up to 500V anode (Plate) voltage. Directly heated tubes like 300B, 2A3, etc. can also be tested. Complete documentation on request. Summary of the characteristics of this lampmeter: Dimensions: 330 x 240 x 140 mm Weight: 4.3 kgs Power supply: 220V - 230V / 50-60 Hz (115 V on request) or on 12V battery with a small (50VA) converter. Consumption: 25 to 35 VA max. on the sector or approximately 2 amps under 12V via the converter Protection fuse: 2 A fast 5 x 20 mm Measurement mode: pulse, managed by 8-bit microcomputer clocked at 12 MHz Adc sampling: 10 bits monotone (1024 points) Duration of a measurement: 800 µSecond Interval between measurements: 0.5 seconds Measurement accuracy: better than 5% +/- 1 digit Heating voltages *: 4 V - 5 V - 6.3 V selectable on the control panel Heating current: 3.5 A maximum Heating voltage accuracy: better than 5% and regulated Grid 1 voltage: 0 to - 100 volts minimum Grid 2 voltage: 15 to 350 volts minimum Plate voltage: 2 to 500 volts minimum Maximum measurable plate current: 340 mA maximum Maximum flow of grid 2 power supply: 60 mA Grid 1 voltage display resolution: 0.1 V +/- 1 digit Grid 2 voltage display resolution: 1 V +/- 1 digit Plate voltage display resolution: 1 V +/- 1 digit Plate 1 current display resolution: 0.1 mA +/- 1 digit up to 34 mA 1 mA +/- 1 digit for I> 34 mA Short-circuit protection and connection errors by current limiting circuits.