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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: More information and photos inside posted by XLR8OR on January 1, 2015 at 20:14:28:
The triangles can be confusing, especially with old code non acid etched print. Sometimes other clues help identify origin. I don't believe welded long plates were made in the Heerlen factory for ecc82 and ecc83. Other clues such as plate construction suggests Copenhagen origin. However their were welded plate ecc81 Heerlen tubes made in the early fifties with old codes which are often mistaken for Copenhagen. It seems the reverse practice for welded vs crimped plates were in practice for ecc81 tubes. Early fifties Copenhagen ecc81 were however crimped plates ! Go figure.
The ultimate test is to audition the tube for factory sound. A reference tube would be helpful. A Copenhagen should have better resolution especially in the mid range. A Heerlen has more extended treble but overall less resolving. The old code Heerlen also has a liquid more euphonic sound to the Copenhagen making it very appealing especially with female vocals, but ultimately less transparent to the Copenhagen.
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Follow Ups
- RE: More information and photos inside - rusiee 08:28:09 01/07/15 (0)
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