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

English Home - Russian Home - English Tube List - Russian Tube List - Mail (c) klausmobile 2001

Hosted by uCoz