Trombone Services
- The slide is thoroughly cleaned and burnished, corks
and felts (and springs, if necessary) are replaced. Minor dents are removed,
slide tubes are straightened and the slide is aligned.
- The slide tubes are cleaned and polished to a high gloss and then sealed with an
automotive-quality baked-in sealant. The sealant keeps the tubes from corroding and makes
the action quicker and lighter.
Trombone Valve Section Chemical Cleaning-$60.00
per rotor
Resonance Enhancement-$175.00
Minibal link
Complete Valve Service
-$100.00 per rotor
- A valve service is a
complete mechanical tune up for your valve(s). It begins with a
chemical cleaning service. Next, the valves are adjusted to remove end and
side play (end play is what causes the annoying click). The bumpers are
replaced with permanent neoprene, the lever hinges are tightened, the levers
are adjusted to provide the optimal valve action, and any worn or missing
screws are replaced. (There is a extra charge for removing broken-off
screws.) Valve services can usually be done on a same-day basis with an
appointment.
Linkage Conversions -$120.00
per rotor
- We can convert
valves from mechanical to string action and vice versa. Popular conversions
include: Conn 8D thumb levers (conversion from mechanical action to string, $250
(suitable for both Elkhart and Eastlake horns), and Bach 42BO trombones
(replace mechanical action with all-metal Minibal action, $120, including
replacement of the hinge-tube). Many other types
of conversion are possible.
- Opening the ports of a rotor can often provide dramatic results. A great many trombone
manufacturers use an oval shaped valve port, which often results in a rotor with an
average bore substantially smaller than the interior of the F attachment tubing (e.g.,
Bach large tenors have an average rotor bore of only .542 to .550, whereas the F
attachment tubing is .562 bore). This procedure brings the valve up to bore, substantially
improving both the open and valve registers in terms of overall response and resistance.
Valve Rebuilding- $300 per
rotor
- A valve
rebuild returns the valve(s) to new (or, in many cases, better than new) condition.
The valve(s) are built up with a coat of copper plating, then hand-fit (lapped) into the
valve casing(s). This process, which may have to be repeated several times, brings the valve
and casing together in the best possible fit, eliminating any low spots. We also adjust
the relative fit of the bearings and the valve body to insure that the valve runs on the
bearings only. We use a static air pressure gauge to measure and control the air tightness
of the valve.
- When the valve(s) has
been properly fit we finish it with a layer of bright nickel plating. Nickel is
non-reactive so corrosion of the rotor is eliminated (although the valve casings can still
corrode). Nickel is also self-polishing, a quality that makes nickel plated rotors become
smoother and quicker as the horn is used.
- The rest of the
valve rebuild is the same as a valve service, usually taking from one to two weeks.
The time can vary greatly with the complexity of the job but we will always try to
accommodate your schedule. Please be aware that special
situations, like previously plated valves which need to be stripped before rebuilding can entail extra charges.
We do not make an extra charge for cylindrical or triple valves. We are happy
to advise you as to any extra charges.
Ed Thayer brought about a revolution in trombone design. His valve,
which provides a straight air path in both open and closed positions, eliminates
the stuffy response and differences in timbre that characterized rotary valves.
The most modern design is made from an aluminum casting which is machined and
then covered with a high-tech hard coat finish that renders it
corrosion-proof. The casing is made from brass and, in this newest design,
can easily be adjusted for end play.
- Tenor Trombone
- Dual Independent Bass Trombone
- Dual Dependent Bass Trombone
Osmun Music is proud to be the first authorized US installer for the Hagmann
valve. This new design combines the strengths of the traditional rotor and
the Axial Flow designs. In addition, the wrap is sized to match the size
of the slide tubing, which noticeably improves response. The very open
curves of the Hagmann wrap enable a totally stress-free assembly.
For more
details, visit the
Hagmann web site.
- Hagmann tenor trombone F attachment with your choice of lever (Bach or
Conn style) and multi-bore slide receiver, installed
- Hagmann dual-independent bass trombone F/D attachment with your choice of
lever and multi-bore slide receiver, installed
 All
trombone valve installations include re-lacquering the bell section.
Our installations feature a level
of attention to detail not available from major manufacturers. Plus, we
can accommodate all special requests at the time of construction. We
can deliver instruments in one month or less.
How to ship your trombone to us
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Osmun
Music, Inc. & Robert
J. Osmun
