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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Soot or burn marks in my Valve Art 2A3s posted by Patrick on April 27, 2001 at 11:30:17:
All SIno made 2A3 dual plates are like that, with a ring of smoke/tar like substance on the inner side of the glass enelope where the upper mica insulator resides. I've been informed by a tube maker that this is due to impurities and improper handling of the mica insulators being used in Shuguang/Sino tubes and when they are heated during normal operation, impurities "evaporated".Mine Sino bi-plate2A3 currently has clocked 2800hrs and the "smoke ring" is very bad looking. Nonetheless my tubes still tested like new (98%) and they sound really good.
Cheers,
Quest ;^>
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Follow Ups
- Re: Soot or burn marks in my Valve Art 2A3s-I wound't worry about it - Quest 11:35:41 04/27/01 (0)
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