Klausmobile Tube Tester Files

Saratov, 04/1970 - This 'RF Oscillator Tube, a ECC42 clone' according to Franz Hamberger, looks very much like 6N3P - tiny plates, smallest ever built in noval package. But the rest of the tube is different - see photograph for comparison. Unlike the ringing 6N3P, this one is shy and needs no special anti-oscillating efforts.

Standard specifications per each triode
Parameter Maximum Operating Point Measured
Ua, V +300 90 112
Ug, V -100 -1.5 -2.0
Ia, mA 18 10.5 10
Pa, W 1.5 1.0 1.1
Gm, mA/V - 6.8 6.3
Rp, kOhm - (3.7) 3.5
Mu, V/V - 25 22

1. Curve at normal Uheater, full operating power. Note that -10V grid bias limitation cannot reveal the high Ua area of this low-mu tube.

2. Closeup to 10mA

3. Gm measurements

Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA

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