Actual pictures. Tested balanced tubes 6n8s by NEVZ. Rare collectible late produsing version from october 1997y.
Tested with L3-3 tubetester at Ua=250V; Ug=-8; Uf=6.3V DC
Results:
T1. t1) Ia=7.5uA ; S= 2.4uA/V NEVZ made in oct 1997
t2) Ia=7.9uA ; S= 2.35uA/V
T2. t1) Ia=9.0uA ; S= 2.5uA/V NEVZ made in oct 1997
t2) Ia=9.4A ; S= 2.5uA/V
T3. t1) Ia=9.7uA ; S= 2.6uA/V NEVZ made in oct 1997
t2) Ia=9.2uA ; S= 2.35uA/V
T4. t1) Ia=8.5uA ; S= 2.5uA/V NEVZ made in april 1990
t2) Ia=8.95uA ; S= 2.4uA/V
$15 per one tube