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Oktava MKL5000 - 6C15P is an error on the Oktava site

Hi everyone

I have an Oktava MKL5000, but I want to experiment with different valves. The problem is that it uses 6C15P, about which it's very difficult to find information. Anyone know compatible alternatives? I've so far found a lot of potentially disastrous misinformation on the Internet.

Any ideas?

Thanks
John Stafford