bach/yamaha euph

Matthew Gaunt · Post by **Matthew Gaunt** » Tue May 10, 2005 5:05 pm

can anybody tell me if the back 4 valve is really the same as the yamaha 321 euph

thanks

Bob Mosso · Post by **Bob Mosso** » Tue May 10, 2005 7:00 pm

There seems to be a couple minor differences from the descriptions on the web sites:

Yamaha/Bach
leadpipe material: gold brass/red brass
valve stems: silver plated brass?/anodized aluminum
the lacquer version of the Bach has chrome plated slide tubes

Chuck(G) · Post by **Chuck(G)** » Tue May 10, 2005 7:46 pm

Bob Mosso wrote: leadpipe material: gold brass/red brass

"Red brass" is usually 90% copper and 10% zinc; "gold brass" (contains no gold) is usually 85% copper and 15% zinc; "Yellow brass" is usually 70% copper, 30% zinc.

So the difference ibetween "gold brass" and "red brass" is quite small. In an alloy of 85% copper, 15% zinc, I imagine that either term could apply.