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student/marching Yamaha pistons heads-up
Posted: Wed Aug 09, 2023 11:38 am
by bloke
I just swapped top caps on a marching baritone piston (ruined junk-drawer piston had a good top-cap / otherwise-good piston had boogered stem threads in its top cap), and - when heating it, LEAD solder barely began bubbling out where the cross-tubes in the pistons meet the surface of the piston...
...so (probably) at least with the nickel-plated "student" Yamaha low brass pistons, the entire piston is lead-soldered together - no brazing.
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Posted: Wed Aug 09, 2023 1:51 pm
by Dents Be Gone!
I agree, guys. This is the way to go.
Re: student/marching Yamaha pistons heads-up
Posted: Wed Aug 09, 2023 5:05 pm
by bloke
Dents Be Gone! wrote: ↑Wed Aug 09, 2023 1:51 pm
Seems like there were a couple of different versions of the low brass pistons over the years. Some of the latest ones I’ve seen feature gaps where those cross tubes meet the piston bodies. I thought to myself, “well, self, that’s something new.”
yeah...That's just crap, and I've seen it with the cheapie-cheap makes, quite often...
(If those pistons don't leak, it's a miracle.)
I also saw a bit of that with that small family-owned factory in Elkhart (located not far from the Conn mansion) - shortly before they sold their name to a jobber - a jobber that now has that name stamped on Chinese imports.