post #31 of 67
10/21/08 at 9:22pm
|Who actually produced 5692s in the USA is a controversial issue amongst tube lovers; here are some of the competing theories:
- All red base 5692s were made by RCA.
- All red base 5692s were actually made by GE, but for RCA (explains the high incidence of GE labeled red bases).
- All brown base 5692s were made by CBS-Hytron.
- Raytheon made a brown base 5692.
- Sylvania made a brown base 5692.
- Westinghouse made a brown base 5692.
[My opinion, based on personal experience, is that GE made red-based 5692s for RCA, and that CBS-Hytron (earlier) and Sylvania (later) made brown-based 5692s.]
Just today, I got a World War II era Sylvania VT-231 for around $18.
Check it. Does it have 3 holes in each plate. Is the top micah shiny and have three "fins"? Is there a lot of copper wiring down below the bottom micah.
If so you have so called "Bad Boy" which is sonically the best of the early 6SN7GTs from the 50s, better than the WWII models.