[Amps] IMD numbers for Russian tubes

[Theo Bellamy]

I have been thinking about changing my plans and building an amp with a
Russian triode(s) in it. In reading the web about these tubes it seems that
most of them were designed to be Radar Oscillators and such, and the fact
they work in HF linear amps is just a pleasant happenstance.

But I can't find any IMD figures on them. How clean are they, compared to
something like an 8877?

Thanks,
Theo K4MO