The Purity Foundation is a Class A, transformer coupled balanced linestage and is the result of years of intensive research directed at attaining the most accurate reproduction of recorded music.  Unique topology and application of the most advanced technological resources and processes bring the Purity Foundation to a threshold of excellence in sound reproduction.  To add to the main features, the Purity Foundation utilizes transformer coupling at both the input and output. Transformer coupling output results in a low output impedance making the Purity Foundation a versatile unit that is capable of driving both solid state and vacuum tube amplifiers with input impedances as low as 600 ohms. Extraordinary transparency of perceived sound which in turn assures the recreation of a three dimensional soundstage.

Monitor loop: The Foundation now has a monitor loop incorporates a monitor loop allowing the use of our Harmonia v2.5 DHT source output stage. Using the Harmonia v2.5 allows you to have a DHT (2A3 or 300B) output stage for all your sources. For more information on the Harmonia v2.5, read more about it here...Harmonia v2.5 DHT output stage

With 1 set of balanced inputs, 3 sets of unbalanced inputs and 1  balanced and 2 unbalanced outputs, connection possibilities are vast. When an unbalanced input is selected, the signal still passes through the input transformer maintaining a low output impedance as well as the resolution and transparency transformer coupling is known for.  Single ended outputs also benefit from transformer coupling. 

As with all Purity Series products, the remote circuit has been granted a dedicated power supply including a separate, standalone power transformer as not to interfere at all with the analog circuit.

The all important circuit contains what we have found to be the best combination of passive components to bring the f

Foundation alive.

Like all Purity Audio Design products, the  Foundation utilizes a hearty choke filtered power supply for the tube stage. Starting with the high current toroidal transformer to the fully regulated DC filament supplies for the tube filaments, the power supply is designed to perform.

On the back panel, you will find the use of high quality connectors. Quality RCA and Neutrik XLR input/output connectors. 

The chassis will be black anodized brushed aluminum measuring 16" W x 16" D x 4" H


Circuit: 6SN7 Class "A" zero feedback
Stage Gain: 15.5dB
Input Impedance: 100k ohms
Output Impedance: <180 ohms transformer coupled
Phase: Inverts
Frequency: <10Hz->1MHz

Purity Audio Design


Class A Tube Preamplifier

​Price TBD

​(Shown below Harmonia v2.5)