Klausmobile Tue Tester Files

08/1974, unknown factory, typical "E"-grade build (double micas, oversized posts, heatsink above second grid).

Pentode mode, UG2=80V

The tube is rated to operate at Ug=150V, but even at -80V it's high transconductance shows up. At the cost of low Vp/Vg2 rating, of course.

Triode mode, grid 2 ans 3 connected to plate

Standard specifications per each triode
Parameter Maximum Operating Point Measured *
Ua, V +250 (+160@G2) - 200
Ug, V - - -3.0
Ia, mA 35 - 12.0
Pa, W 3.0 (+0.7W Grid 2) - 2.4
Gm, mA/V 12 @Ip=15mA, Ig2=4mA - 15
Rp, kOhm 150k for pentode - 3
Mu, V/V - - 45


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

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