Klausmobile Tube Tester Files

Svetlana, 04/1989. Borrowed a friend's sample to test the weird thing - a small triode + 3W pentode (3W plate power, not output :( ). Apparently unused - no stains on bottle sides. Why not make a computer speaker amp with this tube (DC coupled, little or feedback, pentode wired to triode mode? Should make 1/2 Watts at least.

1. Triode

Standard specifications per each triode
Parameter Maximum Operating Point Measured - 1989 tube
Ua, V +250 170 170
Ug, V - (-1.5) -1.5
Ia, mA ? 2.5 2.5
Pa, W ? (0.43) 0.43
Gm, mA/V - 2.5 2.3
Rp, kOhm - ? 29
Mu, V/V - ? 65

1.1. Full power curve

1.2. Gm/Mu/Rp measurements

2. Pentode - triode wiring, 1kOhm safety resistor in second grid.

Too bad - my tester is too weak for this tube and can't drive under -10V into control grid.. Something like 120V-28mA comes to mind, loaded into 1.5-2k load - maybe can make 1/2W into load. Driver must swing at least 15V peak-peak (very low mu for pentode).


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

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