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.
Ligh used but test excellent. Packed in white box. Matched pair are available.
Made by Tung-Sol (1942).
Like the Sylvania Metal base. 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 in original box. Matched pair are available.
Made in USA.
Long gray plate, D-Getter. Premium 12AU7.
Wide bandwidth, well balanced, excellent sound stage and air.Very good tube.
Nos in original box. Matched pair are available.
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. Matched pair are available.
Made in USA.
At first glance, it seemed to be Tung-Sol round place. Construction is very similar to the round place with black glass but it has diamond shape top mica, dual copper grid posts.
It looks very unusual. Supper sounding same or better round base version.
Tested matched and very high as new. One maeked Tung-Sol and other marked RCA
Made in W.Germany by Valvo.
Gold pins version, Closed getter. Very rare today. Super balanced sounding.
Nos in original box. Matched pair are available.
Made in Hamburg - W.Germany by Valvo.
Gold pins, Pinched Waist and O-Getter with double support. One of the earliest 12AT7 in the world was introduced by Valvo. One of three highest grade 12AT7s (GEC A2900, Valvo 6021 Pinched Waist and Telefinken ECC801S). Great bass control and sweet midrange, very musical. Long life tube. Nos in box. Matched pair are available.