• 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.

Getting 60W from 6C33C push-pull

They are very similar in appearance. But apparently they do not resemble a socket 6С33С or they can differ in the diameters of the slats, etc. With collet slats in general, not a single one saw.
To determine the exact correspondence of the dimensions, you need to compare the drawings.
 
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