Klausmobile Tube Tester Files
No plant marking, but it is in fact Saratov (Reflector) factory, made 2000/05. This is regular 6P14P, the better 6P14P-E clone has double getter posts and thicker mica disks. Of course my hardware cannot test the tube at normal I/U, anyway, some results here - triode mode only. Of the 4 tubes in this batch and another two dozen I matched recently - the tube presented is most typical. Mu is fairly constant for all (19-23 for all tubes at 20..50 mA current), but transconductance varies +10% / -30%.
| Standard specifications | |||
| Parameter | Maximum | Operating Point | Estimate |
| Ua/Ug2, V | 300/- | 250/250 | 250 |
| Ug, V | - | (-7) | -6 |
| Ia/Ig2, mA | 65 total | 48/5 | 48 |
| Pa, W | 14/2.2 | 12/1.3 | 12 total |
| Gm, mA/V | - | 11.3 (*) | 18 |
| Rp, kOhm | - | not rated (*) | 1.2 |
| Mu, V/V | - | not rated (*) | 22 |
(*) Standard specs are for pentode mode, 250V at plate and G2
1. Curve at normal Uheater, full operating power
Curves at Uheater=4.9V superimposed on the previous chart. Same transconductance/gain, but effective bias must be raised +0.6V to match operating point. Or, each 0.1V decrease in heater voltage results in 1.5-2.0 mA current decrease (with an unregulated heater supply)
2. 25mA closeup
3. Gm/Mu/Rp measurements
Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA
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