Klausmobile Tube Tester Files

MELZ (Moscow), 09/1980. The first subminiature (10x41 mm), flexible leads type in my collection. Right on mark with specs. Although heater current is only 0.34A, the tube is so small it is very, very hot even with zero plate currents.

Standard specifications per each triode
Parameter Maximum Operating Point Measured
Ua, V 250 100 110
Ug, V - -2.0 -2.5
Ia, mA 12 6.3 5.0
Pa, W 0.9 (0.5) 0.55
Gm, mA/V - 5.0 4.3
Rp, kOhm - (4.8) 5.4
Mu, V/V - 23 23

1. Full power curve

2. 6mA 100V closeup

3. 3mA closeup

4. Gm/Mu/Rp measurements


Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA

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