DIY TUBE TESTER

Design, pictures and information by Jan van Eijck. Thank you for making this available in the internet!

.

 

.

DATA:

  • Filament voltage in four steps, and continuously from 0...175V +/-1 0.1V
  • Filament current until 25V, 10Amps. Above 25V 2 Amp, +/- 10mA
  • Plate Voltage 700V +/-1V
  • Plate Current 200mA +/-1mA
  • Grid Voltage 0-25, 25-50, 50-75, 75-100, each +/-1 0.1V with multi turn pot meter
  • Grid Voltage can be reversed
  • Grid Current down to 0.1uA
  • All tube electrodes can be voltage or current connected with external meters
  • Internal Audio amplifier, for cracks and noise
  • Option to connect oscilloscope, and apply input signal
  • PLate resistor in 10 steps from 10Ohms to 500K, and connection for external resistor
  • Shorts test