Electro-Harmonix 12AX7

12AX7EH is a good all rounder with good amount of gain.

Replaces any 12AX7, 7025 or 12AX7A type tubes including HiFi application. In a guitar amp, 12AX7EH amp application with good bite and definition, and has that vintage rock sound.

For phase inverters, use triode matched.