1x EAT ECC803S “Cool Valve” (A3287 marking). Premium ECC803S / 12AX7 variant. This is a premium preamp tube designed for high-end audio systems. EAT selects and tests these tubes, then adds their Cool Damper system to reduce microphonics and vibration.
EAT A3307 ECC803S 12AX7 “Cool Valve” Gold Pins – Premium Preamp Tube
1x EAT A3307 ECC803S “Cool Valve” tube. Premium ECC803S / 12AX7 variant. This is a premium-grade preamp tube designed for high-end audio systems. EAT selects and tests each tube, then adds their Cool Damper system to reduce vibration and microphonics.