Made by Tung-Sol (1945).
Like the Sylvania Metal base. This is one of the best tube ever made in USA with half smoke glass, Round muddy black plate. Oval mica. Clean, fast, the best in everything, wide bandwidth, great resolution.
Nos but no original box. Packed in white box.
This tubes marked Victor RCA but manufactured by Tung-Sol (1943).
This is one of the best tube ever made in USA with half smoke glass.
Round muddy black plate. Round mica on the top (better than oval mica version).
Nos but only one in original box. Tested matched.
Made in W.Germany by Telefunken.
Diamond Logo on the bottom, Triple mica. Premium of ECC81s. Super high stableness and low noise. Balanced & detail sounding.
One of most wanted 12AT7s in the World.
Nos in original white & black box. Matched pair are available.
Made in W.Germany by Siemens.
Triple mica and O-getter with douple support. One of the great version from Siemens.
Very balanced and detailed sounding. Super low noise and quiet. Great for Phono.
One of the best 12AX7s. Hard to find today.
Nos in original box. Matched pair and quad are available.