This article will discuss servicing of the Lafayette TE-50 tube tester. Electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. Ebay ID = rjputnak The Lafayette TE-50 is an excellent example of a nice portable tube tester that packs a lot of punch into a very small […]
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Redone from scratch, a new product from us at TubeSound. A new manual package for the Hickok 530, 530B, and 510X tube testers. Includes schematics and ballast setup chart. The product covers all three models (530/530B/510X). Benefits include: all instructional text being newly transcribed into computer by hand; factory text errors & grammatical errors corrected;
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This article provides examples of NATIONAL UNION-manufactured tubes. NATIONAL UNION was another quality USA tube manufacturer with most production dating from 1930s to 1950s. Their production numbers were significantly smaller than the big name brands (RCA, Sylvania, GE). The NATIONAL UNION (EIA) code number is “247″. Here is an example: (Left = Sentinel brand 6SN7GT;
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This post provides examples of Raytheon manufactured tubes. Raytheon was an extremely high quality USA tube manufacturer with prolific output, covering both civilian issue and a vast majority of US Military parts production. The Raytheon (EIA) code number is “280″. Here is an example: In this photo, we see three Raytheon-manufactured 6SN7GT tubes featuring Black
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It is quite common to find tubes that have a “brand name” printed on them, but were actually manufactured by a different company. Yes, you can easily find “RCA” tubes made in a Sylvania factory, “GE” or “RCA” tubes manufactured in a Tung-Sol plant, etc. So how do you know which company actually manufactured your
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