• 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.

Any guesses on this tube

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I thought 2E26 right away but the problem with the 2E26 is that I've never seen one without a metal covered base or with the reinforcements like that. These are also definitely fatter.


6146 series and their equivalents almost always have a metal base.


It's most definitely for mobile use.
 
5933/807W ?
 

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