The JJ ECC99 is a unique design recommended for use as a driver for power triodes like the 300B and 2A3. They also work well in the output stage of headphone amps, preamps, and CD players. They can be used in place of 5687, E182CC, 6840, 6BL7 and the 12BH7A in certain amps like Ampeg SVT's. This tube is used in the JJ high end Hi-Fi amps. Also 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.