The Basic structure of all Thomas Guitars, Nylon as well as Steel string, are made by employing the old Spanish method of using a solera to glue the unfinished neck with the intended angle to the soundboard. Then the bent sides are glued with individual wooden blocks to the top, and finally the back is fitted.
This method has some really great advantages both tonally and structurally.
We make laminated quarter sawn necks, and a flat sawn block to connect the neck and foot. This block prevents the foot from being pressed out of the back over time due to wood shrinkage and expansion from varying temperature and humidity changes.
Before gluing the Fretboard we install two carbon rods and a stainless steel truss rod. The carbon rod simply stabilizes the neck and prevents the neck to rise and bend too much over the years. The wedge between Top and Fretboard has some great advantages. Structurally because the fretboard can be thinner, and by reducing the weight of the neck the guitar gets better balanced and at the same time the upper frets are a lot easier to play cause the Fretboard is lifted up in the area of the soundboard
The Fretboard is made of a quarter sawn piece of African Ebony.
The Slots including the nut, and the shape are cut by CNC. That guarantees the perfect position, hides the fret ends and allows the nut to become part of the fretboard for better sounding open strings.
We sometimes use different woods but we still favor Alpine Spruce from our area as these are exactly the same places where the old master Luthiers Stradivari and Guarneri got their wood. Since 2010 we chose the trees in the summer and cut them at a particular time in the winter considering the phase of the moon, following the rules of the old grand masters. The wood is directly cut in pieces and naturally dried. The spruce cut after these simple rules becomes harder and lighter and tends to move less than ordinary cut spruce.
Each model has a particular bracing we use for sake of sound and stability. All braces are split for maximum rigidness and weight ratio. After gluing, the braces are shaped to a certain tone and stiffness.
We use solid shells, different kind of bones, metals and recon. Even our Abalone or MOP purfling is cut from solid pieces and glued in position. We don't use laminated shells or ZipFlex.
We bend our sides on a self-made bending machine with a very accurate temperature limit for each different kind of wood and “bake” them until they become harder and stay in shape.
One advantage of using a Solera for construction is the tension free assemble of the Sides and Soundboard. After being bent the Sides are trimmed and glued into the slots in the heel, and then fixed to the top with small individual blocks.
Our backs are spherically domed with a 4m radius. After the sides have been tapered, we glue a reverse kerfed cedar lining and fit the back. As the Back affects the timbre of the guitar, we work every back a little bit different to interact as good as possible with the Neck and Soundboard. In the case of bracing, we stick to 3 to 4 traditional scalloped back bars.
The bridge is cut of a quarter sawn piece of ebony. It is slotted in a way that the string is held even if you remove the Pin and ramped that the string is guided to the Saddle with a soft break angle. It will never happen to any of our Guitars that the string will pop a Pin out. You could play our guitars even with no Pin in the Bridge. We use the Pins as fine-tuning like different materials for nut and saddle, not for fixing the strings in place.
We’ve invented this unique Cutaway for structural and esthetical reasons. The idea is to change the angle formed by the slot in the heel to the central axis from nearly right angled to obtuse angled, and at the same time switched the position of the slot about 25mm on the top side facing the sound hole. As a result the heel is extended, due to its shape and the angle in a very special and ergonomically way. The advantages are that the heel cap could be normal sized, but the side is still straight and does not have to be bent in a 3rd degree. This simple trick keeps the normal sized and shaped heel, removes any tension of a twist-bended side and at the same time provides great access till the 20th fret.
Within the years the “Barbera Soloist” became our favorite Pickup for steel string and nylon string guitars. The focused tonal clarity, string to string balance and incredible power of projection it provides is truly a game changer for live performance with an acoustic guitar. Its design is very different from usual under saddle pickups, as it is an engineered saddle which contains micro electro acoustic structures within the saddle. This allows for a directionally focused and refined sensitivity and fidelity of sound reproduction that does not amplify microphonic noise from the instruments surface.
Soloist pickups reject microphonic body noise, (finger noise squeeks, bumps, thumps, extreme low end boominess etc.) the elimination of this non musical noise in the amplified signal provides an extremely high level of clarity and tonal purity in the amplified sound. It also greatly decreases feedback sensitivity.
The saddles do not alter or detract from the guitar's acoustic sound. A passive installation allows for a wide range of external preamps to also be used or for preamp free usage when plugging into a guitar amplifier.