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In Reply to: RE: 6sn7 GTA or GTB ??? posted by astralnavigator on October 21, 2009 at 03:38:22
I wonder why that would be considering that the only difference should be the design of the heater core. Maybe you're listening to tubes with different construction or significantly different date codes - remember I specifically mentioned identical construction and date codes. Certainly, tubes that are a decade or two apart in dates may sound significantly different.
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