Thread: Tube designation letters never used
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Old 12-02-2011, 02:06 AM
David Roper's Avatar
David Roper David Roper is offline
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No 6BB6, but don't forget about the 6Sxx series of tubes, which originated for registration of single-ended versions of grid cap octal tubes. Hence the capped 6S7 begat the single-ended 6SS7.
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