The Gold Pin JJ 12AY7 / 6072 is based on the same construction as the non-Gold Pin 12AY7. The internal components go through additional selection and processing during assembly. After working with these tubes for several years we can confirm they do test more consistently and sound noticeably different than the standard 12AY7's. For additional info please click on the individual product descriptions. 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.