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The JJ ECC83s (12AX7) is a high gain preamp double triode valve. thanks to its design it performs with very low noise and microphonics. Harmonically rich with a detailed low end and a warm high end.
JJ 6L6 GC
With the JJ 6L6GC valve, you will achieve more headroom and a fat warm solid tone, The JJ 6L6GC can help clean sounds to be more fuller and the overdrive will give your lead performance the lift and warmth and take away the top-end fuzziness that stock valves sometimes fail to achieve.
This version has a thick glass envelope and extremely robust electrodes. This makes it the perfect workhorse for those guitar amplifiers which use tube rectification.