Klausmobile Tube Tester Files

Dual triode with common cathodes. 02.1955, used (and well used!) All four I have have similar curves, very close to datasheet. BTW, both sections in each tube measured quite well.

This tube is rated for (and intended) to operate in two modes (upper photocopy) class A1 driver, and a class B2 driver with up to 22mA grid currents. Only the first, normal, operation is considered here

Standard specifications per each triode - class A driver
Parameter Maximum Operating Point 1 triode Measured (*)
Ua, V 300 250 242
Ug, V - -5.0 -3.5
Ia, mA ? 90 3 3.0
Pa, W 6 (0.7) 0.7
Gm, mA/V - 3.1 1.5
Rp, kOhm - (22.6) 27
Mu, V/V - 35 40

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

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