Vintage 12AX7A tubes packaged for National. Made in India by BEL (Bharat Electronics Limited). Many people compare these tubes to Mullard. These tubes were made utilizing Dutch Philips/Mullard British-supplied equipment and processes. These tubes were made identical to the Mullard tubes in all ways. They have the same shaped anode plates, support micas and electrode geometry, and the same seamed glass envelope, the spot welding, grid wire spacing. Of most significance the same cathode materials. You will love these tubes.