Martinus Geelen Trumpets

Handmade in the Netherlands

The workshop of MG Trumpets is located in Wijk bij Duurstede, close to "the green heart" of the Netherlands. We build, repair, customize and modify trumpets, cornets and flugelhorns of all kinds, including historic instruments and mouthpieces. We work for anyone who wants us to care for their instruments. Some of our well known regular customers are Miroslav Petkov (RCO), Jacco Groenendijk (RCO), Bert Langenkamp (RCO), Frits Damrow (ex RCO), Hans van Loenen (RFO), Erwin Ter Bogt, Ruud Breuls, Gidon Vas, Suzan Veneman and many other players who really need to be able to count on their equipment to be in perfect working order time after time.

In the workshop we work with the three of us: Mark (Martinus) Geelen, Becci Carr and Kylie Hoogervorst. Mark has been working as a trumpet technician for over 15 years and he also works as a professional trumpet player. He plays with several ensembles like the Dutch Bach Society (see and as a guest player at well known baroque ensembles in Europe. Becci (bec's brassworks) is Mark’s wife and has had an interesting carreer as a designer and seamstress working for Ted Baker and Jack Wills. Then she decided to learn goldsmithing. Becci has magic hands and a good eye for detail. Whenever there is time Becci assists with work on historic instruments. Kylie Hoogervorst is a trumpet student at the conservatory of music of Den Haag. She has joined us in 2024 and she is learning and assisting all the facets of repair, maintanance and instrument building. Kylie is very motivated and talented and we are happy to have her in our team.

Fully Customized 

Since every player has different needs and preferences we make every instrument completely taylored. This we do for all the instruments we offer.

As a professional performing artist Mark knows how important it is that the equipment functions as an extension of musical ideas and the physical input. In the ideal situation the instrument is as little “in the way” as possible. A good matching instrument frees up the players mind and boosts the confidence. 

At the start of the custom design process we always like to discuss these preferences, past experiences with other instruments made by other makers, etc. Ideally see/hear the person play. All to achieve the best possible impression of what is needed. 

This process can lead to a design plan. And that leads to the build of a better custom trumpet. If you are interested to talk about this with me then please contact us. 

For your information

All the product photos on this website are non photoshopped, real life photos. We like to keep things real. If any editing was done then this was only to improve contrast, shadows or brightness of the photos to make them blend in better on the website.

In house part production

This little video below shows what kind of work goes into making in house parts. This is the making of some simple but important natural trumpet components. For small parts we often use the biggest machines. Not what one would expect. Every little step has to be of high quality using decent machinery because part making is a chain of events that need to end up in the best and nicest fitting parts to produce the best and nicest instruments ;).

Classical Trumpet Corpus with a Bb Crook

Classical Trumpet Corpus with a Bb Crook

Primarius Bb royary overblow key setup

Primarius Bb royary overblow key setup

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