The JJ E83CC is a true Frame Grid style, high quality, low noise replacement for any 12AX7 type tube. These are available with current Balanced triodes for phase inverter use and Balanced and Matched in pairs or multiples.
All our preamp tubes are stringently tested for noise and microphonics using Amplitrex testers driving an external amp. There is no extra charge for low noise and microphonics testing like with other tube vendors. If a tube does not pass our strict performance criteria it's tossed or sent back to JJ Electronic for evaluation.
Sonically the JJ E83CC sounds similar to their classic ECC83S but with a firmer extension in the lows and highs, as well as more definition from top to bottom. In guitar amplifier circuits most users will observe a more open overdriven sound with improved definition and clarity at extreme settings.