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I had never seen rotary valves like these before, the stop corks seem to be mobile with a single fixed pin.
Is this unique?

The original valves on my "BART" project were the same way. Just an earlier way of making rotary valves. The tuba is obviously older - look at the "low pitch" extension.

sousaphone68 wrote:I had never seen rotary valves like these before, the stop corks seem to be mobile with a single fixed pin.
Is this unique?

My Schuster "Army" has the same setup:


Original Cerveny BBb "Tornister" has (to me) an even odder setup: bumpers in bellcrank as above but stops in the "S" links.


I love old horns.

Thanks for both replies and the pictures are brilliant