A great, economical tube. The Shuguang 6550s are made in China. We have had great results with these tubes. Their bad reputation is due to the quota system the company used which caused them to ship any tube which looked like a tube regardless of its ability to perform. We have weeded out the 'bad apples' by testing them to the same specs as our other tubes (520 volts on the plate!). These perform well in the RM 200 which runs them at 720 volts.
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