• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Where did these EL84 numbers come from?

Looks like he is talking specifically about the Russian versions and not NOS. Here is some data I found using Wayback:
 

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