I figured this was a better place to post rather than cluttering up an informative thread with dumb questions and perhaps petty bickering.
post #42
Does this alteration of interior bore also have the same effect when applied to barrels?
I am slowly searching for a barrel for an SML 5*. ATM my horn is a bit sharp and the twelfths are a bit off. If I was to find a barrel of suitable length could the mouthpiece be modified with this poly diameter bore to correct intonation or would it make more sense to have a mouthpiece modified to correct intonation first, and then go after a barrel? OR should the two be purchased at the same time and modified as a pair to give the best end results?
I hope the answers are in the future as I realize this is a recent discovery, but it sounds like a pretty big discovery (re-discovery?) to me.
Keep up the great thread Steve
Carl H.
post #42
So this is an area which can be explored to correct imperfect twelfths?In my mpc stock I have a pre 1938 and a post 1938 Selmer mpc. What significance is that .. well at first I thought the only difference was the Brand system markings on it. These were simple marking that specified the facing and tip opening.
But on prepping the pre 1938 for sale I noticed alot more differences that aren't realized by just looking. First off the mpc went on a mpc arbor much more further ( 0.58 inches - over half an inch) than the other one. So this brings forth that the internal shank bore design is much different.
But how does the shank bore affect the tonal quality of the mpc ?
It's realitively quite simply, though quite complex as even minute changes - hundreds of an inch can have some pretty drastic effects.
For example:
A smaller diameter bore can make the lower register including the throat tones relatively sharp. This can also make the higher register flat and less sonorous.
a larger diameter bore can do the opposite - make the lower register including the throat tones flat. But to the contrary make the higher register sharp but more sonorous.
Of course one can ream out the bore to be cylindrical or conical. And on a conical bore the taper will affect how the mpc plays based on the diameter at various points of the taper.
But these two mpcs have at least a 3 stage reaming .. ala polycyclindrical bore of different varying sections.
In examinging two 1926ish Selmer mpc we have the same variation. One is a HS, the other a HS*. The HS has a overall smaller diameter bore than the HS*. THe HS seems to have 2 smaller tapers, and the HS* has 3 larger tapers.
As you can see it seems as though it can get quite complex. So 2 mpcs of the same brand, and made only a few years apart, can be quite different.
A little later we'll summarize review the tip, side rails, and more importantly the roof of the mpc (opposite the window) and how slight changes to it can greatly affect intonation and timbre.
Does this alteration of interior bore also have the same effect when applied to barrels?
I am slowly searching for a barrel for an SML 5*. ATM my horn is a bit sharp and the twelfths are a bit off. If I was to find a barrel of suitable length could the mouthpiece be modified with this poly diameter bore to correct intonation or would it make more sense to have a mouthpiece modified to correct intonation first, and then go after a barrel? OR should the two be purchased at the same time and modified as a pair to give the best end results?
I hope the answers are in the future as I realize this is a recent discovery, but it sounds like a pretty big discovery (re-discovery?) to me.
Keep up the great thread Steve
Carl H.
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