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Most probably. AFAIK silver solder first started being used with Reynolds 753 tubing which is the 'heat treated' version of 531 (both are a manganese moly alloy). While 531 was typically brazed (lugged cappilary joints or fillet brazed/bronze welded) the temperatures involved would destroy the properties of 753. Because 753 was so temperature sensitive Reynolds would only sell this tubing to builders after completion of a test coupon.Done to avoid brazing it on the butted part of the top tube?