I will try to measure vacuum tubes and post here frequently about tubes that hard to find information especially characteristic curve.
Hope this will help many people to discover good and reasonable price tubes on worldwide markets.
First is LS7/CV1660, Directly Heated Triode tube from England, ST shape with brown base.
Can make good sound small power amplifier or preamplifier.
Vf = 4V
If = 0.15A
Va = 150 Volts
Vg = -6 Volts
Ia = 10 Milliamperes
Mu = 12
Rp = 5,000 ohms
Gm = 2,400 Micromhos
Happy New Year 2022 to all of you.
Cheers!!!