Design, pictures and information by Jan van Eijck. Thank you for making this available in the internet!
in 2023, I was informed that Jan has passed away some years ago. This tester however went into good hands of a friend of his.
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Filament voltage in four steps, and continuously from 0...175V +/-1 0.1V
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Filament current until 25V, 10Amps. Above 25V 2 Amp, +/- 10mA
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Plate Voltage 700V +/-1V
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Plate Current 200mA +/-1mA
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Grid Voltage 0-25, 25-50, 50-75, 75-100, each +/-1 0.1V with multi turn pot meter
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Grid Voltage can be reversed
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Grid Current down to 0.1uA
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All tube electrodes can be voltage or current connected with external meters
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Internal Audio amplifier, for cracks and noise
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Option to connect oscilloscope, and apply input signal
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PLate resistor in 10 steps from 10Ohms to 500K, and connection for external resistor
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Shorts test
