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 |
| Ug, V | - | (-1.6) | -1.1 |
| Ia, mA | 35 | 16 | 16 |
| Pa, W | 2.5 | (2.3) | 1.5 |
| Gm, mA/V | - | 19 (11..25) | 12.6 |
| Rp, kOhm | - | (2.5) | 4.8 |
| Mu, V/V | - | 50 | 61 |
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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