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GE 6SN7GTB tubes with filaments on top

85.141.246.210

I have two GE 6SN7GTB tubes with filaments on top, green lettering on glass. What are they (year of manufacture and overall rating?) In a particular amp, they surpassed the Sylvania VT-231 (much warmer and lifelike, more relaxed, but more colored), while the Sylvanias are good when used in another amp.

I will appreciate all comments and opinions.


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Topic - GE 6SN7GTB tubes with filaments on top - tubers 14:26:25 07/24/06 (1)


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