DXT Electro-Acoustics Pty Ltd

COMPANY PROFILE

DXT Electro-Acoustics Pty Ltd was established in 1999. The company was founded by Donald Tan, an Electronics engineer by training. More importantly was Don’s  long time passion and love of music that steered him into hifi audio right from a young age of 13 years old.

When the company started, Don was doing repairs on vintage and high-end  Vacuum tube amplifiers. While repairing , he noticed most amplifiers were not up to speed i.e. they  exhibited flaws in one way or another. Surely, there must be a better way to design and manufacture amplifiers, Don thought.

The need for improvement was on the agenda. So this prompted Don to design and build his own Vacuum Tube Preamps and Amplifiers. So, when DXT E-A started handcrafting  amplifiers a lot ideas were put in based on the knowledge gained through repair works.

The first product in 2000 was a 4-Tube  DXT-03 Preamp complete with Tube rectification, all in one box. It had tone controls and also a Phono stage incorporated.

In 2001 saw three products, namely the DXT-12, DXT-25 and DXT-08.

The 2 nd product which was the DXT-12 push-pull monoblock amplifier. It generated 12 watts of power and  had 4 amplifying tubes based on the famous triode-connected KT66 as output tubes. It has a  Tube rectifier. Transformers and choke  were over-engineered for improved performance and long term reliability.

The 3rd product, DXT-25 push-pull monoblock amplifier came out shortly after the DXT-12. It generated 25 watts of power and had 4 amplifying Tubes based on the famous triode-connected KT88 output tubes. It also had Tube rectification.

Responding to many requests for separate boxes for a Preamp (void of tone control for a more accurate reproduction) and a separate Power Supply Unit saw the 4th product, the 5-Tube DXT-08 Preamp. The Power supply unit had Tube rectification and a Tape Loop facility for real-time tape monitoring. This product became very popular and was in production for many years.

In 2007, the 5th product , the DXT-17 push-pull monoblock amplifier was made. It generated 17 watts of power and had 4 amplifying tubes based on the famous triode-connected Mullard/Phillips EL34 output tubes. Again, Tube rectification was used for the purity of the power supply.

Again, responding to many requests for a Preamp to able to drive low inpedance Solid State amplifiers, the 6th product DXT-08 Preamp(codenamed L.O.P.I.) was made in 2008. The acronym L.O.P.I. denotes Low OutPut Impedance. It had 6 Tubes and an extremely  low output impedance capable of driving Solid-State amplifiers as well as Tube amplifiers. Sadly, with the advent of the 6-Tube Preamp saw the demise of the 5-Tube Preamp.

In 2009 the response from customers for a more powerful amplifiers to drive medium efficiency speakers (86dB) sparked the invention of the DXT-45 AMP, the 7th product.  This monoblock utilize a pair of pentode EL34 to generate 45 watts of power. The success of the DXT-45 provided the platform and blueprint  to be able to double the power for the next monoblock, the DXT-90.

In early 2010 the calls from the power-hungry Apogee owners necessitate the invention of the Parallel Push-Pull DXT-90 AMP, the 8th product. This monoblock utlises two pairs of pentode EL34 to generate 90 watts of power. Like all DXT amplifiers, the output impedance of this monoblock could be strapped to 1 or 4 Ohms to match the ultra low impedance of the Apogee speakers.

In  2011 saw the emergence of a Mark II version of the highly acclaimed DXT-12 AMP, the 9th product. It has the same design as the original DXT-12 but now incorporates a wide bandwidth output transformer. This is easily recognized by its larger physical size.

This amplifier surpasses the famous vintage LEAK TL12.1 monoblock in terms of robustness, build quality and most importantly very dynamic and musical. As the power output of the DXT-12 is only 12 watts, this monoblock works best with vintage Alnico-based 100dB speakers such as ALTEC, JBL, UNIVERSITY, CORAL and etc. Given these matching conditions, the DXT-12 is able to reproduce the most  beautiful vocals  up-todate  ahead  of other DXT models.

Towards late 2011 a revised and slightly more powerful monoblock , the DXT- 30 Amp was conceived with newly designed transformers. It has the same signature sound as the previous DXT-25 since the revised amp uses similar vaccum tubes as before. The DXT-30 now replaces the former DXT-25.  The pair of KT88 output tubes are triode-connected to give the “triode sound” i.e. a tight and deep bass, sweet vocals and airy highs.  We also included the all-important Screen Grid voltage stabilser. This was the 10th product.

Towards late 2012, a Parallel Push-Pull triode-connected KT66 25-watter monoblock was conceived, codenamed DXT-25 PPP amp. The goal then was to develop the big brother of the famous DXT-12.  Pure triode sound, high damping factor and very low distortion. This Amp is the holy grail for speakers with sensitivity of at least 92dB. This was the 11th product.

In mid 2013, after successfully building a prototype PPP Tetrode KT66 monoblock, it was discovered that we were able  to still produce a sound close to triode-connected  KT66 but with doubled  power amidst a slightly higher distortion and a narrower bandwidth.  Thus was born the new DXT-25 amp.  This was the 12th product.

In mid 2013 also saw a genuine breakthrough in MC Phono amplification. We successfully developed a truly Tube MC stage employing an ECC88 tube. This unique  product differs from many brands that utilized a MC step-up transformer or a Solid-State module for the Head Amp section. This resulted  in better dynamics and that luscious mid-band frequencies like female vocals. An AB test will quickly convince oneself the difference between  both step-up transformer or Solid-State Head Amp and the DXT-08 MC preamp.

In the  third quarter of  2013 we developed a  Parallel Push-Pull Tetrode KT66 amp, a 50-watter amp, codenamed the DXT-50 Amp. It has the same characteristics as the DXT-25 but double the power. This Amp would partner low efficiency speaker of sensitivity of about 86dB. This was the 13th product.

To this day, all DXT products are handcrafted in Brisbane, Australia with all the associated parts like chassis, transformers, front panels, nameplates which are  also manufactured in Australia. This is truly a 100% Australian owned and Australian-made product.

All products sold in Australia carry a 10% GST while exports are GST-free.


Rev #05. DXT Electro-Acoustics Pty Ltd
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