Klausmobile Tube Tester Files
See also: 6S3P 'regular civilian', 6S4P-EV pages
Reflector (Saratov), 03/1968. A great single triode. High frequency, high-Gm, high-Mu, low noise. You won't believe it looking at it - the plate assembly is tiny, half the size of 12AX7 or 6N2P plate, how did they squeeze all that juice there? But it has the guts indeed. The catch: 8pF input capacitance and only 160V rated plate voltage. The twin tube, 6S4P, has the same DC anf gain specs, but different capacitances: very low grid-to-plate (0.2pF) yet very high input (13pF). Tradeoffs everywhere...
Unlike the other ('civilian' without E-suffix) 6S3P, this one is closer to specs
| Standard specifications per each triode | |||
| Parameter | Maximum | Operating Point | Measured - 1961 tube |
| Ua, V | +160 (??) | 150 | 151 |
| Ug, V | - | (-1.6) | -1.5 |
| Ia, mA | 35 | 16 | 15 |
| Pa, W | 2.5 | (2.3) | 2.3 |
| Gm, mA/V | - | 19.5 | 18.0 |
| Rp, kOhm | - | (2.5) | 2.3 |
| Mu, V/V | - | 50 | 41 |
1. Gm/Mu/Rp measurements
2. Full power curve
3. Closer look at operating point
4. 10mA 200V closeup
5. 4mA closeup. Pretty clean, but a lot of other tubes can do it too
Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA
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