Overview
This Bach 42T is an early 1990s professional tenor trombone featuring a genuine O.E. Thayer axial-flow valve. Serial number 146639, it is a single-owner instrument with documented provenance, original Bach factory paperwork, and its original brown Bach zippered plywood case.
Built on the established Bach 42 symphonic platform, the 42T combines an 8.5-inch one-piece yellow brass bell, .547-inch large-bore handslide, open-wrap F attachment, and the original Thayer valve design. It offers the broad Bach sound and familiar 42 response with a notably open feel through the valve register.
Condition Summary
This instrument has never been damaged and has no dents or dings. The bell, attachment tubing, tuning slides, braces, and handslide remain exceptionally straight and well preserved.
The original owner had the lacquer professionally removed, a modification chosen by many players during the 1990s. The work was performed properly and gives the instrument the natural appearance and feel of unlacquered brass without evidence of amateur stripping or damage.
The raw brass finish has developed normal natural patina and color variation consistent with an instrument that was professionally de-lacquered many years ago. The photographs accurately show its present appearance.
This instrument was professionally serviced before arriving at The Brass Exchange. The O.E. Thayer valve is quick, quiet, and responsive. The handslide is in very good condition with smooth, dependable action. This trombone is mechanically ready to play and should not disappoint.
Specifications
- Model: Bach Stradivarius 42T
- Era: Early 1990s
- Serial number: 146639
- Bore: .547-inch large bore
- Bell: 8.5-inch one-piece yellow brass bell
- Valve: Genuine O.E. Thayer axial-flow valve
- Valve details: Engraved valve plate and original wood paddle
- F attachment: Open-wrap configuration
- Finish: Professionally de-lacquered raw brass
- Ownership: Single-owner instrument
- Case: Original brown Bach zippered plywood case
- Documentation: Original Bach factory paperwork and care materials
- Mouthpiece: Not included
Player Perspective
The Bach 42 has long been one of the established standards for orchestral, concert band, wind ensemble, solo, and college-level performance. Its broad tonal center, projection, and familiar resistance profile have made it a dependable professional platform for generations of players.
In the 42T configuration, the original Thayer valve provides a more direct airflow path through the F attachment. The result is a less noticeable change in resistance when the valve is engaged, particularly in the middle and low registers.
This example would be especially appropriate for:
- An advancing student purchasing a first professional-level symphonic trombone
- A college player preparing for ensemble, audition, and recital work
- A professional or experienced player who prefers the response of an original Thayer valve
- A Bach player looking for a clean early 42T with documented single-owner history
The very good handslide and quick, quiet valve make this an approachable instrument for a developing player while providing the professional performance capability needed for long-term use.
The Original O.E. Thayer Valve
This Bach 42T is equipped with a genuine O.E. Thayer valve rather than a similar-looking axial valve from another manufacturer. The original Thayer design uses a conical rotor and a more direct airflow path to reduce the resistance commonly associated with traditional rotary valves.
Proper setup and maintenance are especially important with an original Thayer valve. The valve on this instrument operates quickly and quietly, allowing the player to experience the open response for which the Bach 42T became known.
Value Perspective
At its current price point, this instrument represents an especially attractive value for a player seeking a professional-level Bach symphonic trombone. It combines excellent mechanical condition with a genuine O.E. Thayer valve, documented single-owner history, original factory paperwork, and its original Bach case.
The comparable Bach model produced today uses the newer Infinity axial valve. For players who specifically appreciate the feel and response of the original O.E. Thayer design, a clean and complete early Bach 42T like this offers a compelling alternative to purchasing a new professional instrument.
Questions Trombone Players Often Ask
Is this a genuine O.E. Thayer valve?
Yes. This Bach 42T has a genuine O.E. Thayer axial-flow valve with its engraved valve plate and original wood paddle.
How does the Thayer valve differ from a traditional Bach rotor?
The Thayer valve provides a more direct airflow path through the F attachment. Many players experience less resistance and a more consistent response when moving between the open horn and valve register.
Does the de-lacquered finish indicate damage or refinishing?
No. The original owner intentionally had the lacquer professionally removed, as many players chose to do during the 1990s. The instrument has developed normal natural patina and has no history of structural damage.
Would this be appropriate as a first professional trombone?
Yes. This would be an excellent choice for an advancing student, college player, or serious adult musician seeking a first professional-level large-bore symphonic trombone. It offers established Bach 42 playing characteristics with the open response of an original Thayer valve.
Has the instrument been serviced?
Yes. It was professionally serviced before arriving at The Brass Exchange. The handslide is in very good condition, and the valve is quick, quiet, and responsive.
From Our Shop
Original Bach 42T trombones occupy an interesting place in the development of the modern symphonic trombone. They retain the familiar Bach 42 bell and slide while offering the distinctive response of the original O.E. Thayer valve.
Condition and mechanical setup vary considerably among surviving examples. What distinguishes this instrument is not simply the valve stamped O.E. Thayer, but the complete package: single-owner history, excellent structural condition, very good slide, quick valve, original case, and factory documentation. It is a genuine player’s instrument with unusually strong provenance.
Fulfillment & Ordering
📦 Ships via Federal Express the same business day whenever possible.
🛡️ Professionally packed, fully insured, and carefully prepared for safe arrival.
✅ Every instrument receives a final inspection before shipment.
📧 Tracking information is provided immediately after your order ships.
✍️ Looking to reduce your out-of-pocket cost? Consider trading in your current instrument. Complete our Trade Evaluation Form, or use the convenient orange Trade Evaluation box located next to the Add to Cart section on this page.
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