Klausmobile Tube Tester Files

6N2P: 01/1958, unknown plant. Light-grey (seems like uncoated at all) plate. Double-layered thick mica. Upper mica sits immediately above plate assembly. Getter dish suspended by s single post.

6N2P-EV: 08/1982, Voskhod (Kaluga). The plant is still alive and well. Single-layered mica. Upper mica spaced about 3 mm above plate assembly. Getter dish on two posts. Plate also looks like uncoated.

Both tubes measured close although weaker than specification. Inside each, triodes differed, around 0.1-0.2 V grid voltage differential.

Standard specifications per each triode
Parameter Maximum Operating Point Measured - 1982 tube
Ua, V 300 250 234
Ug, V - (-1.5) -1.5
Ia, mA 10 1,8 2,0
Pa, W 1.0 (.45) (.46)
Gm, mA/V - 2.25 1.8
Rp, kOhm - 50 44
Mu, V/V - 98 77

1. Curve at normal Uheater, full operating power

2. 3mA closeup

3. Gm/Mu/Rp measurements

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

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