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Hirsbrunner HB-50 First Valve repair

Postby tubamatt97 » Sat Jun 02, 2018 5:16 am

Does anyone have any experience with replacing valves, know of anyone who might have a spare to sell, or could custom-make a new valve? My HB-50's first valve sustained some damage in the years before I bought it, and was badly repaired with lead solder, leading to some air leakage. I have contacted Hirsbrunner but the only valve they have is slightly too small (0.12mm!).

Thanks in advance!
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Re: Hirsbrunner HB-50 First Valve repair

Postby bloke » Sat Jun 02, 2018 8:23 am

There is no need to contact me privately, because this is all that I know...

...but for some latter-era (not current era) Hirsbrunner piston tubas I noticed that the pistons were nickel plated, large diameter, and had a little gimmicky adjustable valve guide (a horizontal cylinder of delrin that can be slid in-and-out and locked into place).

I also noticed that those particular valves from that particular era are nearly identical to B&S valves except
- valve guide located on a different side (easy to move)
- Hirbrunner are barely smaller diameter (easy to lap in a B&S valve to fit a Hirsbrunner casing)
- B&S is stainless steel, instead of nickel plated (either "so what", or have Anderson plate a B&S stainless steel valve to size)

I have NO IDEA whether your tuba was made during the era that Hirsbrunner was using those valves...and - even if those Hirsbrunner valves were NOT actually made by B&S and "cloaked" to be something else - the port alignment is the same, and diameter is within .001" of the same.

...and that's all I've got for you.
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Re: Hirsbrunner HB-50 First Valve repair

Postby PMeuph » Sat Jun 02, 2018 12:28 pm

Have you tried bring your horn to a very good repair tech? If you give use your location, the TNFJ will give you names.

While I don't know what one new Hirshbrunner piston (or B&S if Bloke's suggestion works for your tuba), I speculate that it would not be more than having a good tech, fix the leak, and if need be send the piston off to Andersen.

Also, a piston will not be a plug and play repair, a good tech will have to fit it in the casing.
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Re: Hirsbrunner HB-50 First Valve repair

Postby tubamatt97 » Sun Jun 03, 2018 12:05 am

bloke wrote:There is no need to contact me privately, because this is all that I know...

...but for some latter-era (not current era) Hirsbrunner piston tubas I noticed that the pistons were nickel plated, large diameter, and had a little gimmicky adjustable valve guide (a horizontal cylinder of delrin that can be slid in-and-out and locked into place).

I also noticed that those particular valves from that particular era are nearly identical to B&S valves except
- valve guide located on a different side (easy to move)
- Hirbrunner are barely smaller diameter (easy to lap in a B&S valve to fit a Hirsbrunner casing)
- B&S is stainless steel, instead of nickel plated (either "so what", or have Anderson plate a B&S stainless steel valve to size)

I have NO IDEA whether your tuba was made during the era that Hirsbrunner was using those valves...and - even if those Hirsbrunner valves were NOT actually made by B&S and "cloaked" to be something else - the port alignment is the same, and diameter is within .001" of the same.

...and that's all I've got for you.


Thanks for your reply, my tuba was made in 1982, would that be around the right time?
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Re: Hirsbrunner HB-50 First Valve repair

Postby tubamatt97 » Sun Jun 03, 2018 12:07 am

PMeuph wrote:Have you tried bring your horn to a very good repair tech? If you give use your location, the TNFJ will give you names.

While I don't know what one new Hirshbrunner piston (or B&S if Bloke's suggestion works for your tuba), I speculate that it would not be more than having a good tech, fix the leak, and if need be send the piston off to Andersen.

Also, a piston will not be a plug and play repair, a good tech will have to fit it in the casing.


Thanks! I'm located in Melbourne, Australia, but willing to ship/go overseas if needed.
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Re: Hirsbrunner HB-50 First Valve repair

Postby PMeuph » Sun Jun 03, 2018 10:37 am

tubamatt97 wrote:Thanks! I'm located in Melbourne, Australia, but willing to ship/go overseas if needed.


There's Ken Herrick who's a repair tech in Australia and a forum, he may be able to fix or assess your problem. I don't know how close he is to Melbourne.

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Re: Hirsbrunner HB-50 First Valve repair

Postby bloke » Thu Jun 07, 2018 5:04 pm

Compare your valves to someone's B&S or M-W valves. Ignoring the position of the guide, rotate them around, and see how similar they are.

If one tuba's valves fit in one of the two tuba's casings, then the answer to the question you asked me would be "yes".

If you piston is damaged but might be repairable. Dave Secrist at Anderson Silver Plating can repair it.
If the other pistons fit into that piston's casing, send another piston, and he will send the repaired piston back as a perfect cylinder that is exactly the same diameter as the undamaged sample piston.
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Re: Hirsbrunner HB-50 First Valve repair

Postby Patrase » Sat Jun 23, 2018 4:40 pm

Matt

Try Gustafson custom horns in Adelaide
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