Klausmobile Tue Tester Files

Novosibirsk, 02/1978. This all-metal tube is a direct copy of original US 6SH7, built since mid-30s. At least, it's in the 1939 Soviet Tube book. Of the two tubes on test, the one presented is the weaker, although still matching original curves.

Pentode mode, UG2=80V (the above chart is for UG2=100V).

Tube data also lists pentode operation at +26V at plate and G2, but these tests weren't impressive enough to publish. So long exotics, time for triode wiring.

Triode mode, grid 2 connected to plate

Standard specifications per each triode
Parameter Maximum Operating Point Measured *
Ua, V +300 (+165@G2) - 210
Ug, V - - -3.0
Ia, mA not rated - 10.0
Pa, W 3.3W (+0.7W Grid 2) - 2.1
Gm, mA/V 4.9 @Ip=10.8mA - 5.3
Rp, kOhm 900k for pentode - 7.4
Mu, V/V - - 39

(*) I make no claim that this point is good at all, it's simply close enough to rated pentode O/P.

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

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