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Gold Series SAG 12AX7 Matched Phase Inverter
Specially selected from premium Groove Tubes preamp tubes which have been tested in their normal rigorous fashion to meet the GT standard. Groove Tube’s Special Applications Group (SAG) provides further testing and grading for certain performance characteristics.
The matched phase inverter tube will assure a balanced output section when used with matched power tubes (highly recommended) which will assure sustain across the entire range of your instrument.

