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In Reply to: RE: ** Thanks, guys *** posted by Tom Bavis on May 13, 2013 at 06:57:15:
I have a couple of 6080 tubes with that color base that are labeled IBM. I use them in an OTL headphone amp and they sound really good.
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- I.B.M tubes - Mechans 05/14/1314:50:30 05/14/13 (0)