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6H13C instead of 6AS7G

Posted by cousinbillyl on October 31, 2004 at 05:18:16:
I am in the process of buying a used MA1 Silver Edition. The tubes he wants to send are 6H13C' instead of 6AS7G's.
I read somewhere 6H13C' are mil spec. Reflector tubes?.
I have also looked at one of my M60's 'Sovtek' 6AS7G tubes and it has the 6H13C printed on it's side.
Anyone with added information?.