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Re: Repair help (selmer 33 bass octave mechanism)

Author: Chris P
Date: 2020-01-19 01:33

Also check the linkage from the throat A key (the arm running under the throat A touchpiece) to the speaker mechanism isn't holding the lower vent open. The lower vent should open with the speaker key and throat A key held down together and then close when you release the throat A key (and the mechanism switches over and opens the crook key).

There should be some lost motion before the throat A key makes contact with the linkage arm which in turn links to and actuates the same part of the mechanism connected to the RH3 fingerplate to open the lower vent. If there's no lost motion, check the throat A key hasn't been bent as well as doing all the other checks.

There's a fair bit of chasing your tail setting up automatic mechanisms of any kind to make them work correctly. You have to see how the entire mechanism works with the instrument assembled (crook and both upper and lower joints, minus the bell).

Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.

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