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Matamp / GT40 MK III / Amp For Sale


The GT40mkIII is a classic British voiced single channel head with boost. A valve rectified EL34 based amp capable of a surprising range of classic tones from a simple to use interface.

The GT40mkIII is the perfect amp for those searching for classic British tones in an easy to use hand wired format. 

The GT40mkIII goes from warm clean with a hint of Series 2000 to full on classic rock tones. The EQ is a more conventional design than other Matamps so most players will feel instantly at home. The goal was to create a great amp that is quick and easy to dial in together with foot switchable boost perfect for studio and stage.

Custom UK made transformers help to delivery great dynamics and depth. Hand wired turret board construction for serviceability and longevity.

The compact head format makes the amp surprisingly portable and the modest 40w output from a pair of EL34 valves fed by a GZ34 valve rectifier is just right for most gigging guitarists.

30 day build time required

Weight: 20 kg

Dimensions: 55 x 24.5 x 26.5 cm

Channels: 1 with Boost

Panel Controls: Gain, Boost, Bass, Middle, Treble, Presence, Master

Auto Biasing: No

Preamp Valves: 3 x JJ ECC83

Effects Loop: Passive 

Handwired: Yes

Output Valves: 2 x JJ EL34

Power (W): 40w RMS clean power

Transformer: Proprietary UK made

Turret Board: Yes

Cathode Biasing: No

Fixed Bias: Yes

Footswitch Controls: Boost

Ohms Output: 4, 8 & 16

Rectification: GZ34

Output Class: AB Push Pull

Matamp, UK  

Contact name:
Hayden Minett
Opening hours:

Each amplifier is hand built using high quality components mounted on precision-machined turrets and complemented with transformers made to our own design specification.

The Matamp story goes all the way back to the early days of Rock'n'Roll. In the 1950s, the engineers at Radio Craft (as the company was then known) began repairing, modifying and improving various amplifiers, at customers' request. In 1964 they decided to design and build their own amplifiers, and so the Matamp Series 2000 was born. By the late 1960s the growing reputation of Matamp amplifiers led to a collaboration with Orange Music in London. Orange Matamp amplifiers and mixers proved to be both popular and robust. Some of them are still in use forty years later! In the mid 1970s, Orange and Matamp parted company as they wanted to develop in different directions. Matamp concentrated on the booming disco market, developing the ground breaking Supernova mixer and the Quasar series power amplifiers (used by BBC Radio 1 Roadshow among others). Guitar amplifiers took a back seat for a while, with the last new guitar amplifier model being the now highly sought after V14 of which only 41 were produced.

Matamp continues its long tradition of hand crafting amplifiers just a few miles from where it all started in Huddersfield, West Yorkshire. The business is built on over sixty years of heritage and innovation within the field of audio engineering and on a reputation for the highest build quality and careful attention to detail. We are still pioneering new industry trends with our standard range of amplifiers, complemented by our ever-popular customising service.

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