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In Reply to: RE: 6sn7 GTA or GTB ??? posted by em on October 20, 2009 at 14:20:25
The difference between GTA and GTB is that the GTB has controlled warm-up heaters so that they can be used with two or three heater filaments in series, otherwise their specifications are identical. In terms of sonics if the manufacturer, date codes and construction are the same I would guess that the sound would be the same.
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