Klausmobile Tube Tester Files

See also: 6N8S page.

06.1963, Novosibirsk plant pentagram. A very old octal single triode design, Franz Hamberger refers it as 6J5GT clone. Domestic vintage books refer to it as identical to 6N8S (aka 6SN7) triode. Anyway, the tube wasn't used frequently because of dual triodes' cost savings, only recently it became promoted by some audiophiles and designers.

Data on this tube is somewhat confusing, - domestic sources (Spravochnik Radiolubitelya, Kiev 1957) quote operating currents slightly different from Franz Hamberger's tables. I'd refer to the 1957 book (although it's three-digit-precision numbers seem quite funny).

I had only two tubes of this breed, so which is more typical - beats me, I picked at random and here it is. Both tubes had Gm and Mu slightly higher than datasheet numbers.

Standard specifications per each triode
Parameter Maximum Operating Point Measured - 6/1963 tube
Ua, V +330 250 250
Ug, V - -8.0 -8.5
Ia, mA 20 9.0 9.0
Pa, W 2.5 2.25 2.25
Gm, mA/V - 2.55 3.3
Rp, kOhm - 8.05 7.3
Mu, V/V - 20.5 23

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

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