That reminded me of something entirely different - gaps (in an extreme example):
There's brass in it, all right, but this one little spot is
inexcusably empty by two/three millimeters in depth or so. I don't worry about it, because the gap is closed, and it isn't nearly as deep as the flash picture makes it look.
Funny thing though - while the '70 all-chrome Paramount seems to be lax with the silver solder, it is the antithesis of the '61 when it comes down to lug thinning:
Its still uneven though - the joint between the downtube is far thinner then most of what curves around the headtube (and, of course, the other side of the head lug espouses "Friday Job").
-Kurt