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I have an older Deville 410 and one of the stock, Groove Tubes 6L6's was on the fritz. I replaced them with the best available at my closest local store at the time.... it was a matched pair of Mesa's GC (STR-440). I've been very pleased with them. They were a noticeable improvement over the stock groove tube. I'd replace them with the same set down the road.....
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