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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