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Thread Starter 

Heya,

 

 

I have been puttering around with the some Russian tubes as of late (6N23P to be exact).  I was wondering if anyone could please tell me what the ev designates. The best I could find from my research is "heavy duty".

 

I really am starting to like the sound of them, particularly the ones from the 70's, just wanted some more info before I tried the ev type.

 

 

Thanks for your time.