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.
Valve Testing Options
1 & 2. Premium Tested & Balanced Triodes are tested on specialised digital and analogue testing equipment by Karltone as follows
Test results are provided with purchase
3. Factory Tested from the JJ Factory