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Gap on my Bach 43/25LR


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James Becker
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PostPosted: Mon Jan 21, 2019 5:42 am    Post subject: Reply with quote

[quote="dontiego"] Do you have any comment on "gapless leadpipe"? Don't you think that's what they tried to achieved?

I've always had issue with no gap receivers on instruments designed with a specific gap in mind. There are design elements within the instrument that depend on either having a gap or not. Who knows what they thought the benefit would be. Where the slightest change in venturi diameter from .345" up to .351" can be dramatic, let alone any varieces of gap, it's not something I'd suggest anyone mess with. Besides, there is no going back after the damage is done accept to replace the entire mouthpipe assembly.

Yes, a new pipe will play a bit more spred when taped on, but in your case I think you'll get a pretty good idea what you've been missing. Once soldered on you'll feel a sight more resistance. It's always nice to have something to blow against.

Good luck!
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dontiego
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Joined: 08 May 2011
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PostPosted: Tue Jan 22, 2019 8:42 am    Post subject: Reply with quote

lipshurt wrote:
There are a few oddball things with your horns, and James has addressed your Bach weirdness .... but you 38b has a “replacement receiver”?

The 38b does not even have a receiver. It’s all one piece of electroplated copper over two mandrels one fro the receiver end taper and the other is the main leadpipe mandrel. The two are screwed together and then electroplated until it’s really thick and then the thick walled result is turned down thinner on the big end and also turned down where the “receiver” would normally be, to make it look like two pieces. If yours has a “replacement receiver” it’s means that someone sawed the old one off and added one. I suppose it’s possible, but def weird. 38b receivers are amazingly consistent (not that amazing considering the electro-form process) and they all have (all I’ve checked, which is is only about maybe 25...but that is fairly a lot) have a gap of .110 with a .385 (Bach) mouthpiece.

All in all, you have some unusual happenings in your horn collection..


Previous owner apparently tinkered by himself, that's sad.

On the other hand I'm not a fan of the valves, so I don't know if it's worth it.


Last edited by dontiego on Sat Mar 09, 2019 6:49 am; edited 1 time in total
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lipshurt
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PostPosted: Tue Jan 22, 2019 9:22 am    Post subject: Reply with quote

I search eBay all the time and have found two NOS pipes.

There is a chance that yours was made that way if it’s a 38b from about 1886 of so. Those looked like real 38b but had two piece bell and two piece lead pipe and that two piece pipe was frail
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cheiden
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PostPosted: Tue Jan 22, 2019 9:42 am    Post subject: Reply with quote

Ed Kennedy wrote:
...PS IF you want to go more open and bright try a 43 pipe.

FWIW my 43/43 plays quite well and doesn't feel unreasonably open to me at all. It's a really good combination. My teacher says the more open pipe balances the tighter bell making for a good all-around horn.
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dontiego
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Joined: 08 May 2011
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PostPosted: Wed Jan 23, 2019 4:04 am    Post subject: Reply with quote

lipshurt wrote:
I search eBay all the time and have found two NOS pipes.

What's this, is this the process you previously described? Do you mean that you found two currently for sale?

lipshurt wrote:
There is a chance that yours was made that way if it’s a 38b from about 1886 of so. Those looked like real 38b but had two piece bell and two piece lead pipe and that two piece pipe was frail

Mine is from 1966, IIRC. Anyway, the pipe is what it is and beyond salvation. It's not unplayable, I also feel it's getting better when increasing the gap. But if not too costly, it would feel good to restore it with an original leadpipe. Although I've read a regular mouthpiece might not fit them well?
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yourbrass
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PostPosted: Sat Jan 26, 2019 10:37 am    Post subject: Reply with quote

dontiego wrote:
lipshurt wrote:
I search eBay all the time and have found two NOS pipes.

What's this, is this the process you previously described? Do you mean that you found two currently for sale?

lipshurt wrote:
There is a chance that yours was made that way if it’s a 38b from about 1886 of so. Those looked like real 38b but had two piece bell and two piece lead pipe and that two piece pipe was frail

Mine is from 1966, IIRC. Anyway, the pipe is what it is and beyond salvation. It's not unplayable, I also feel it's getting better when increasing the gap. But if not too costly, it would feel good to restore it with an original leadpipe. Although I've read a regular mouthpiece might not fit them well?


If your instrument was made after 1958, it should take a standard taper mouthpiece. Conn and some other manufacturers had gone to the taper we consider standard by then.
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