More from Amazon.com : http://www.amazon.com/gp/product/B008HOXK6C?tag=thefatkidin06-20
Matched Pair Premium Grade Psvane 12AX7-T Mark ? Vacuum Tube High-end in Gift Box
Gold coated brass base to improve shielding to interference Gold coated pins to enhance connection over long term Can be used to replace Shuguang 12AX7-T directly All parts are selected to the highest grade plus only highly experienced workers to assemble Suggested burn-in time is 75 hours