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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