News: 27th Anniversary!!



After 27 years of designing and building Directly Heated Triode(DHT) preamplifiers the Supratek DHT preamps are possibly the pinnacle of tube preamp design.

Supratek released the first commercially available 300B, 45, 101D and 4P1L DHT preamps and is constantly refining the state of the art in tube preamp design.

From 2014 I will only be building DHT preamps on a mostly custom basis.

The older 6SN7 based indirectly heated triode designs will finally be retired after more than a thousand were built. I’m now time limited and will concentrate on the limited production DHT preamps.

Two models will be available from 2014:

The tube moving coil phono Cortese will now have a 4P1L DHT line stage. It will come in two versions, one with balanced/unbalanced outputs and the other with unbalanced RCA outputs only.

The Cabernet DHT linestage will be built on a custom basis to suit owners taste and systems.

The Cabernet will use the 4P1L NOS tube- an exciting , precise sound that is accurate and detailed.  Tight, deep bass, this tube will let you hear the recording with  all of its finesse. Very engaging , hard to turn the music off! The 4P1L is a very balanced tube with the magical  DHT sound that suits most systems.

The 4P1L is unique in that tube variations are rare- it is manufactured to exacting conditions and may be the highest quality DHT tube available. It does not need matching for stereo use and is ideal for audio. Supratek has over 500 4P1L in stock .

Options to the 4P1L are:

300B- this is a warmer , more “tube” sounding preamp for those that want this character in their system.

The Cabernet Reference  This is a very special preamp based on years of DHT design and building. It uses the 4P1L  DHT tube, and has a switchable Lundahl input transformer. It also has a switchable 6SN7 tube driver stage and a switchable Magnequest output transformer. All these options can be used singly or in combination to give a wide range of gain , impedances and sonic signatures. Its the ultimate preamp able to give the best of any system. I've been using this design in my best system for over 6 months and cant imagine DHT design getting better than this.

All preamps are built with the same high quality componentry, massive power supplies, thick copper chassis (chrome plated or anodised) and the heart of Supratek designs, the tube shunt regulator.

Prices will remain fair and considerate- Supratek preamps better preamps costing 3, 4 or even 10 times the price. Some hi-fi prices these days are ludicrous- I have more respect for my customer friends and offer  the highest quality with reliability at a fair price.

The Supratek products retain their value , but most are still in the hands of the original owners, many approaching 30 years!

Please note only Cortese DHT and Cabernet DHT available. All other models on this web site are now archieved.