Martin Seibold TSE 7 Tone Stability Enhancer for Trumpet and Flugelhorn

Tone Stability Enhancer for Rotary Valve Trumpet & Flugelhorn!
  • Effective connector between the 1st and 2nd valve
  • Stabilizes and centers the tone
  • Easier and more secure response
  • More volume, higher tone quality
  • Simple installation (no tools needed)
  • Made in Germany
Variants (2)
Martin Seibold TSE 7S Tone Stability Enhancer for Trumpet and Flugelhorn (Trigger)
Martin Seibold TSE 1 Tone Stability Enhancer for Perinet Valve Instruments
Martin Seibold TSE 7S Tone Stability Enhancer for Trumpet and Flugelhorn (Trigger) Martin Seibold TSE 7S Tone Stability Enhancer for Trumpet and Flugelhorn (Trigger)
Martin Seibold TSE 7S Tone Stability Enhancer for Trumpet and Flugelhorn (Trigger)
  • Effective connector between the 1st and 2nd valve
  • Stabilizes and centers the tone, more volume
  • Easier and more secure response
  • Simple installation (no tools needed)
  • Made in Germany
59€
Martin Seibold TSE 1 Tone Stability Enhancer for Perinet Valve Instruments Martin Seibold TSE 1 Tone Stability Enhancer for Perinet Valve Instruments
Martin Seibold TSE 1 Tone Stability Enhancer for Perinet Valve Instruments
  • Effective connector between the 1st and 2nd valve
  • Stabilizes and centers the tone, more volume
  • Easier and more secure response
  • Simple installation (no tools needed)
  • Made in Germany
59€
59€
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free
Delivery time 1 - 2 working days
Priority Shipping
+ 0,99€
Shipping on 12.10.2026
Express Shipping
+ 5,90€
Delivery on Tuesday, 13.10.2026, if you order within 2 Days 51 Min. 
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Small Stabilizer, Big Sound!

The tone stabilizer from Martin Seibold is screwed in as a connecting intermediate piece in the valve casing of the instrument. The sound becomes fuller and purer thanks to the Tone Stability Enhancer (TSE). The tones respond more easily and lock in better, which in turn makes the player perform more confidently and securely. The tone stabilizer is hardly noticeable in weight and can be mounted almost invisibly on the instrument due to its compact dimensions.

Easy Installation

For installation, unscrew the knurled screw from the TSE. Place the threaded part from behind onto the valve casing as shown in the sketch (see image 2) and hand-tighten both parts together using the knurled screw so that the TSE rests on both valve casings.

About the Manufacturer

The idea for the Tone Stability Enhancer comes from Martin Seibold, who has made a name for himself as a supplier of small parts for instrument makers. His company is based in Baiernrain, a district of the Upper Bavarian municipality of Dietramszell. Martin Seibold is especially known as the inventor of the established Minibal ball joint, which he introduced in the mid-1990s.

Innovation and Highest Quality - Made in Bavaria!

Features

  • Martin Seibold Tone Stabilizer for Trumpet and Flugelhorn
  • Type: TSE 7
  • Suitable for Trumpet and Flugelhorn with Rotary Valves
  • Effective connector between the 1st and 2nd valve
  • Stabilizes and centers the tone
  • More volume
  • Fuller sound
  • Higher tone quality
  • Easier and more secure tone response
  • Simple installation (no tools needed)
  • Made in Germany

Scope of delivery

  • 1 x Martin Seibold TSE 7 Tone Stability Enhancer for Trumpet and Flugelhorn

Specification

  • Product number 00081323
  • Instrument Flügelhorn, Trompete
  • Colour Silver

Reviews

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Noticeable Improvement in Low Notes
Review from Frederick on 08.05.2026
Variant Martin Seibold TSE 1 Tone Stability Enhancer for Perinet Valve Instruments
This rating has been translated automatically. Original language flag from
I bought this tone stabilizer for my marching euphonium.
According to the manufacturer’s specifications, this stabilizer is suitable for any instrument with Perinet valves.
While installing it, I noticed that the “jaws” don’t make full contact—so the TSE tends to touch the valves with its edge. I can’t say whether this affects its intended function.

The tone is well stabilized in the lower registers and helps produce a rich sound. When transitioning from low to higher notes (starting at B’), I find it harder to hit them cleanly with the TSE. Here, I felt that I hit the notes better without it.
Perhaps it’s just a matter of getting used to it, or it depends on how the TSE is mounted.
Or maybe it’s simply because the edges—and not the pads—are resting against the valves….

Nevertheless, even here in the high notes, the tone (after playing it cleanly) is richer and more stable, though not quite as noticeable as with the low notes.

I haven’t tried it on the trumpet yet. I’ll get to that. So far, though, my priority has been the euphonium.


Conclusion: a good gadget for more advanced brass players. For beginners, I’d recommend starting without a TSE for now.

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