A few thoughts:
A builder friend who does repairs thinks highly of the joinery of Pinarello but not of Colnago.
Any builder who doesn't learn by cutting up joints (usually test joints) doesn't know much about their brazing.
Beyond simply getting fill and not cooking the joint, there are other considerations. Regarding the fill, when silver or brass is applied intelligently, it's easy to recognize a filled joint. With practice one learns to read when the joint is getting too hot and how to avoid it. For any but the most novice brazer, missing fill is more likely caused by overcooking and boiling some of the fill out.
Other considerations are how evenly heat is applied to the joint, how quickly the braze is done and heat can be withdrawn, and how well aligned the joint is after cooling. A good brazer doesn't need to cold-set much if at all. This is good because the newer generation of tubes are much hard to cold-set. Moreover, selective application of heat to a tube can change (and improve) alignment. Its a matter of learning how one's tubes react to one's technique and adjusting the later to achieve best results.
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