Posted by pistonizer on November 19, 2003 at 17:16:10:
I have two pistons available for sale that fit the O-L-D 3/4-size student model top-action 3-valve Mirafone tubas (1970's vintage).
I believe these valvesets were configured a couple of different ways, and this valveset has the knuckles between the valves "up high" and the knuckles leading into and out of the valve cluster "down low".
Both of these pistons include the top cap, stem, and finger button, and both have some minor nickel plating wear. The #1 piston has its original nylon guide intact.
$35 + postage for either piston.