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In Reply to: Antique Sound Lab 6550 Tubes - made by ? posted by Steve M. on May 26, 2020 at 07:22:29:
These are Chinese made tubes. Groove Tubes sold them as their 6500C line for awhile. I had a couple of quads. Never tried them and peddled them off.
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Follow Ups
- RE: Antique Sound Lab 6550 Tubes - made by ? - kmolles 16:37:56 06/03/20 (0)