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. Additionally the tubes undergo a battery of tests for basic performance characteristics and faults such as: Emissions, Transconductance, H-K and Grid leakage, etc...
Further, all of our E88CC's undergo a lengthened test duration to insure stability and accurate test results (as is necessary with all high current pre's).
If a tube does not pass our strict performance criteria it's tossed or sent back to JJ Electronic for evaluation.
The JJ E88CC Gold Pin's are true to spec examples of the classic E88CC/ECC88/6DJ8/6922 tubes. These use JJ's short plate design which makes them very resilient to microphonics and mechanical noise. The gold pin variations have a wider frequency response with a very smooth transition into clipping.
For most standard driver/input applications our standard selection is suitable. For stereo or parallel driver applications refer to the balanced or balanced and matched options.
