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As a restorer and an Electrical Engineering student less than an academic year from graduating; I can tell you that contrary to any claims by marketing departments one brand of tube was almost never better than any other...The exceptions were where circuits pushed tubes too far (such as the RCA CTC-17 tv IIRC ate 6GH7 tubes like candy and some brands could take the abuse better), tubes that were originally bad designs (many 6X5 tubes were prone to shorting and destroying the power transformer, however some brands later improved the design to make it safer), and some off brands (places that did not make radios/TVs/electronics or rebadged the cheapest crap they could get)particularly the budget and Japanese brands would produce inferior product and/or do other fishy stuff.
And definitely change that cap!
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