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Foundation Linestage - W/ Remote Volume & Bluetooth Streamer

NOTE: Aug 2023 - We are now working on assembly of the Foundation Pre in our new Aluminum chassis. New Pictures coming soon.


Purity Audio Design has become known over the years for its high end, sometimes exoteric preamplifier designs. We are now focusing on bringing you a high percentage of our more expensive preamplifiers in a more down to earth priced product. We know preamplifiers!


The 6922 based Foundation is a Class A tube preamplifier designed around the 6922/6DJ8 dual triode. The design goal of the Foundation preamplifier was to provide an audiophile quality preamplifier at an affordable price.


The Foundation Series products are built into a custom chassis built for Purity Audio Design with in house CNC and laser engraving


Line-level preamplifier. Three line inputs plus one built in Bluetooth input, two line outputs and one SPDIF (digital) output from wi-fi streaming board.

The Foundation line preamplifier is designed to complement most power amplifiers available including tube or solid state design.

Designed by Bill Baker in usual Purity Audio Design fashion, the Foundation Preamplifier is the perfect match for any high end system, whether biased towards analogue or digital. The Foundation is a simplest Class A design allowing the purist signal transfer.

The power supply is of usual Purity design. A high quality toroidal transformer feeds a solid state CLC (choke filtered) design. Tube filaments are powered with separate regulated supplies.

The circuit is designed  in such a way as to have a maximum tube life for the 6922 tubes.

The preamplifier has more than enough output for any power amplifier, transistor or valve, and is ideal for driving long interconnect cables to remotely located power amplifiers due to its low output impedance.


Balanced Version

The Foundation is available as a full balanced unit. 

Foundation Preamplifier

Features

  • Aluminum chassis with CNC engraved Cedar hardwood/acrylic front panels
  • Class A circuit
  • Neutrik XLR connectors
  • Neutrik RCA connectors
  • Alps remote volume control w/Mute
  • Solid state choke filtered power supply employing a high current toroidal transformer with a separate transformer used to drive the remote volume control.

Technical Specs

  • Tube Complement: (2) 6922 driver tubes
  • Features Two sets of RCA inputs/One set XLR inputs
  • One Bluetooth 5.0 internal input with digital output 
  • Two sets RCA main outputs.
  • Gain: 15dB
  • Input Impedance: 100Kohms.
  • Output Impedance: <200 ohms.
  • Frequency Response: 20hz – 200Khz 
  • Dimensions: 12Wx12Dx5.5H
  • Weight: 
  • Direct Selling Price: $2,499 balanced
  • Warranty: 3 years parts and labor. 90 days on tubes and

                     hardwood chassis.

Showing the back panel of the Pre, you can see the single ended and balanced inputs/outputs as well as the digital output from the Bluetooth Streamer Board.

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Purity Audio Design

607.768.0067

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