Klausmobile Tube Tester Files
See also: 6S3Pi-E mil grade, 6S4P-EV pages.
Reflector (Saratov), 11/1961. See the page on mil grade 6S3P-E that is right on specs. This sample wasn't as fine as predicted. The brand new tubes both were 40% weaker that typical specs, hence double Rp. The operating point MUST be shifted to avoid grid currents. Anyway, the Gm/Mu combination is quite qood. Since the 6.3V and 5V heater voltages produce identical Gm/Mu/Rp, I'd presume the tube is working yet not within the specs.
|Standard specifications per each triode|
|Parameter||Maximum||Operating Point||Measured - 1961 tube|
|Ua, V||+160 (??)||150||150|
|Gm, mA/V||-||19 (11..25)||12.6|
1. Gm/Mu/Rp measurements - no, it doesn't make 19 mA/V ...
2. Full power curve
3. 10mA 200V closeup
Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA
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