• 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.

6sn7 & 6sn7GTB

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You are correct sir! If you get a copy of Morgan Jone's book "Valve Amplifiers", 3rd edition, you will see extensive analysis and comments including distortion measurements on 6SN7's and the 6J5 (same size bottle but only half as filling).

I only found this tidbit of knowledge out recently during a visit to my establishment by the author Mr. Jones in the flesh. He was perusing through my audio valves inventory and saw some NIB 6SN7GTB Hit-Rays. He specifically suggested that I not waste them wherever I need merely a 6SN7 and explained why. I had previously assumed (mistakenly) that ALL 6SN7's had the 450 volt plate rating.
 
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