I bought an Audio Research Reference 3, and to place the valves, I saw (apart 6H30 ) had a 6L6GC. But on page Audio Reserach shows that takes a 6550C. Are equivalent? and if so which I recomiendadn to mount
Take a look at the Ref 3 section of the arcdb.com database. They state that the 6L6GC was in the earlier models, replaced later by the 6550C. I wouldn't think the two are interchangeable. Be safe and check with Audio Research customer service.
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