Purity Reference
Class A, Balanced, Transformer Coupled Linestage

Now available with several upgrade options

The multi award winning Reference linestage continues to get better. The Purity Reference 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 Reference to a threshold of excellence in sound reproduction.  To add to the main features, the Purity Reference utilizes transformer coupling at both the input and output. Transformer coupling output results in a low output impedance making the Purity Reference 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.

The best sounding volume control next to autoformers is one that has the least resistance in the path and can maintain consistency throughout all frequencies, for this we chose to use a modified shunt type - The Reference not utilizes autoformer attenuation as well as secondary autoformer for a 6 position adjustable gain.

The Reference now incorporates Dynamicap Stealth capacitors in the output stage. Enhancements in the power supply include the use of high current toroidal transformers and 100% polypropylene filter capacitors. For 2016, the Reference now incorporates a newly developed tube power supply using the 5R4 rectifier. Tube filament power is now supplied by a high quality, highly regulated DC supply for the quietest possible presentation.

With 3 sets of balanced inputs, 3 sets of unbalanced inputs and 2 sets each balanced and 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. Absolute phase and balance control are selected both through the supplied aluminum remote handset and the front panel controls.

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.

A new feature found on all 2014 Series linestages is the ability to connect the new headphone amplifier module allowing you to have a state-of-the-art vacuum tube headphone amp that utilizes the Reference circuitry. Another new feature now found on the Reference linestage is HT Bypass allowing you to integrate the Reference into and home theater system utilizing a home theater processor.

Shown at right is the Reference utilizing the 5R4 tube power supply. Notice the only visual change in the upper chassis is the addition of the tube rectifier and autoformers for attenuation. The tube power supply is designed around the 5R4 diode and uses a CLC topology with a full polypropylene first stage.


  • Type : Class "A", Zero feedback, triode vacuum tube preamplifier
  • High/Low output gain switch
  • Circuit gain: adjustable from 5dB-17dB
  • Input impedance: 100K
  • Output impedance: <180 
  • Recommended output load: >2000 ohms
  • Frequency response: 13Hz-35kHz -1dB
  • Total harmonic distortion: 0.05% @ 1V output
  • AC Power Requirements : 117/220/230/240 volts (factory wired)
  • Fuse: 1.2 amp fast blow (1/4" x 1-1/4")
  • Tube lineup : 6SN7 or 12AU7 ×2 / 5R4 x1
  • Dimensions : 16" Wide x 16" Deep x 6" High
  • Net Weight :
  • Shipping Weight:

US Retail Price: Contact Us - Your choice of solid state or tube power supply
US Suggested Retail Price: $12,495 as described above.

Power Supply - Solid State

  • A large high current toroidal transformer
  • Separate power transformer and DC power supply for remote control system
  • Dual Choke filtered power supply
  • Polypropylene power supply filter capacitors
  • StealthTM (Ultra Fast) diodes used throughout.

Power Supply - Tube Rectified

  • High current mains transformer
  • Capacitor input, choke filtered
  • Multiple polypropylene capacitors make up first stage filter bank.
  • High value final stage capacitor bypassed with quality film capacitor.
  • Teflon tube socket
  • 5AR4 rectifier.

Please see our Product Comparison Chart for pricing and to help you in making the proper decision for your system goals.


What our customers are saying

  • 0 dB negative feedback
  • Pure tube design (no transistors)
  • Passive home theater bypass
  • Autoformer attenuation/volume control
  • Autoformer adjustable gain
  • DynamiCap Stealth capacitors
  • Shortest possible signal paths
  • Very low output impedance to drive any tube or solid state power amp
  • Audiophile grade passive components used in all applications
  • Teflon tube sockets
  • Central one-point earth grounding
  • Fully hand assembled to insure the highest level of craftsmanship 
  • Relay based source selector with no shared grounds
  • No common ground between any inputs.
  • 100% point to point wired - NO PCB
  • ROHS silver solder used for the best electrical connection
  • Selector switch engages relays located near RCA jacks to switch all inputs
  • 2 6SN7 or 12AU7 tubes for stereo line-amplification
  • Regulated DC filament supply for signal tubes
  • Balanced output transformers (Custom made for Purity Audio Design)
  • Balanced input transformers (Custom made for Purity Audio Design)
  • Premium internal signal cable uses Silver Plated Copper/Teflon
  • Twin chamber design separated by aluminum plate effectively fights against RFI and EMI.
  • 3 pair XLR balanced inputs
  • 3 pair RCA single ended inputs (transformer coupled)
  • 2 sets XLR balanced outputs
  • 2 sets RCA single ended outputs (transformer coupled)
  • Home Theater Bypass
  • All 4 sets of outputs active at all times allowing for multiple configurations for bi-amping or use of an active subwoofer(s)
  • RCA high quality Teflon silver input jacks
  • Neutrik/Swiss - XLR chassis connectors
  • Remote Control for Volume, Balance, Mute, Phase Reverse & display off
  • Chassis material: Aluminum
  • Chassis finish: Black anodize
  • Solid aluminum remote handset
  • Equipped with high quality IEC AC power cord
  • Made in USA
  • Three years parts and labor warranty. 90 days on supplied tubes


"Select Component”


Component of Exceptional Merit
Martin DeWulf
Bound for Sound  

See our Reviews Page for details