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Questions about tubes and gear that glows. FAQ

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RE: They are simply blank or have 68HC marked on the tube

Posted by Mechans on March 10, 2017 at 10:56:45:
The really expensive NOS Russian 6SN7 equivalent is a Melz Metal base. OK but the key are the plates, they are the hole plate variant. You'll have to get a good pair to decide for yourself if it is what you prefer sound wise