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 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 G.Britain by Mullard (1950s).
Clear glass, Brown base, Bottom D-Getter. Can bring to you the superb sound. Nearly same as 6SN7s family and can be replace for them BUT can be not used for replacing where the plate volate over 300V.
Nos in original box.