A chemical cleaning
starts with a complete disassembly of the instrument. We remove buildups of old
grease and oil and use special chemical baths to remove the corrosion and other materials
from the inside of the horn. No metal is removed in this process and lacquered finishes
are not disturbed. We do not use chromate dips which, in addition to being very
damaging to the environment, etch bare brass surfaces and can remove metal from the inside
of the instrument.
- After the cleaning
the rotors are bathed in oil and reassembled and restrung. We grease
the slides, oil the levers and springs, and check the instrument thoroughly.
If any other repairs are needed we can diagnose them and advise you.
- Recommended every one to two years, depending on
the individual player. In addition to regular maintenance this service will
prolong the service life of the instrument by reducing the effects of
dezincification (corrosion from the inside out - pink spots, red rot, etc.)
Very cost effective insurance for your prized horn. We can do chemical
cleanings on a same-day basis with an appointment.
- A valve service is a
complete mechanical tune up for your valves. 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.
The recommended interval for this service varies between every three to ten
rebuild returns the valves to new (or, in many cases, better than new) condition.
The valves are built up with a coat of copper plating, then hand-fit (lapped) into the
valve casing. 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 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. 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 3-10 days.
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.
Screw bell / detachable bell conversion
Can be done to any horn, new or old. Horns travel much
more safely in flat cases or cut bell
gig bags. A very practical operation with no detrimental side effects!
Cast Metal Stop Plates
- Holton horns (except
H104, 109,209) have stamped sheet metal stop plates that flex and bend in use.
The elliptical screw holes allow the plate to "wander". We can
replace them with heavy duty cast stop plates that contribute to a more positive feel and
maintain proper valve alignment for the life of the instrument.
8D 4th Valve Lever
- 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) and Bach 42BO trombones
(replace mechanical action with all-metal Minibals). Many other types
of conversion are possible.
Conn 8D Prep. Click on link for more details.
Neoprene valve stops
- We offer valve stops
in a variety of materials: synthetic rubber in three different durometers
(hardnesses), a soft natural silicone, and a clear silicone-like synthetic.
Unlike the shaped bumpers used by some manufacturers our materials are
round in cross section. When properly installed they don't break or
compress. The harder bumpers give a very positive feel. Softer
materials feel more forgiving under the fingers and are quieter. Our
bumper installations include shaping the stop plates to hold the
material firmly without compressing or cutting the material and
carefully aligning the valve ports. When properly installed, synthetic
bumpers do not bounce or "flutter"
Schmidt Piston Valve Rebuilding
- In order to
successfully rebuild a piston it needs to be honed from both ends to return the
casing and piston to perfect cylindricity. In order to work on a Schmidt
change valve casing it needs to be removed from the instrument. After
the piston and casing are trued the piston is built up with copper
plating and refit to the casing. Then we add a final coat of hard nickel
plating and hand fit the piston to the casing. We also replace the valve
guide and spring and check and correct valve alignment if necessary.
When the casing is out of the horn we can also repair the knuckles
leading from the casing. .
How to ship your horn to us
If you'd like to discuss custom work on your horn, you can
email our repair staff at