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|
|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|
(*) 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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