Purity Ultra & Ultra GT
The Ultimate Dual Mono, Transformer Coupled, Class A Balanced Linestage



Ultra Series 2


The "Ultra Series" is a no holds bar product for requiring the absolute best.  In addition to all the features found in the Purity Silver Statement, the Ultra brings to the table further enhancements that bring the Ultra  into a class of it's own.

The Ultra dual mono balanced linestage is a  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 Ultra to a threshold of excellence in sound reproduction that has yet to be experienced or equaled. 

The Series II brings to the table not only a newly design aluminum chassis but also several enhancements to the circuit including new custom made balanced input transformers, highly regulated DC filament supplies (one per channel), new grounding scheme and a new layout design.

Overall there is a total of 3 isolated chambers, two chambers in the top analog chassis and a separate chamber, located in a separate chassis that houses the business end of the dual mono power supply.

The new Series 2 circuit is optimized for both the 6SN7 and 12AU7 tube types. The 6SN7 octal tube sockets are standard on the Ultra series models and all units come equipped with Sophia Electric 6SN7 tubes. Also included is an adapter allowing you to start rolling 12AU7 tube types for even more versatility.

A distinctive feature of the Ultra GT setting it apart from it's competition is it's multiple large capacitance storage banks. Each of the two channels contains 12 large value polypropylene capacitors allowing the Ultra to provide the fastest and tightest dynamics available from a vacuum tube linestage. In addition to the large power rails, also featured in the Ultra  is the use of multiple Bybee Quantum Purifiers per channel as well as the latest Bybee Music Rails. One Music Rail per power supply providing a dead quite, black background and ultra low noise floor.

To add to it's main features, the Ultra utilizes 100% silver transformer coupling at both the input and output stages on the GT version. All signal wire is a high grade solid core OCC silver. Transformer coupling output results in a low output impedance making for better integration with any type of amplifier as well as providing an uncanny sense of transparency and resolution Highest quality Dueland copper foil capacitors (with built in Silver bypass on the GT version) are used in the final stage of the circuit with all signal wire duties handled by “VH Audio OCC Silver AirLok” hookup wire. Attenuation is handled by a balanced autoformer design. The GT version brings to the table Silver Bybee purifiers feeding the inputs. Also available by special order are Pure Silver Autoformers for those who appreciate what a silver signal path brings to the table. Located at the output stages is two more pair of Silver Bybee Purifiers. Extraordinary transparency of perceived sound which in turn assures the recreation of a three dimensional soundstage.

The Ultra GT contains a total of 10 Bybee Quantum Purifiers. Four large units found in the power supply and 6 Silver Purifiers found in the signal path providing the absolute best in transparency, resolution and extension at the frequency extremes.

An additional feature of the Ultra is the use of a pair of secondary autoformers feeding the input of the tube circuit allowing for six different levels of output gain to match the Ultra with any power amp on the market. In addition to this feature, the Ultra also has the ability to run in full passive mode while still retaining full transformer coupling as well as the benefits of all the Bybee Purifiers in the signal path from input to output.

Extensive research, testing and listening led to unique, innovative design that achieves very low distortion and wide bandwidth without the need for negative feedback which destroys transient purity.

The full function remote handles volume, mute, balance, source select and phase as well as being able to completely turn off the display. The very precise autoformer attenuation provide 1dB increments.

The power supply is quite possibly the first of it's kind in the industry. The power supply contains a total of 12 large value polypropylene capacitors that make up the Ultra  choke filtered power supply storage banks. Each of the two independent DC rails are then fed into Bybee Music Rails further reducing any potential residual noise.

Bybee Quantum Purifiers are installed in both legs between the transformer secondaries and the rectifying stage.

The Ultra's power supply provides what we believe to be the cleanest, most noise free B+ voltage found in most any audiophile product in the industry today.

  • Type : Dual mono, dual chassis Class "A", zero feedback, vacuum tube preamplifier
  • Inputs : Unbalanced ×3,  Balanced ×3 (unbalanced inputs transformer coupled)
  • All inputs go through a balanced transformer (unbalanced outputs transformer coupled)
  • Outputs : Unbalanced x2/ Balanced x2-- ("pin 2 hot" studio standard, pin 1 grounded with lift option)
  • Function : Input selector, Volume, Phase Inversion, Balance, Mute & Display on/off
    All functions controllable via both remote and front panel
  • Passive mode - fully transformer coupled with all functions
  • Input impedance: 100K ohms
  • Output impedance: <180 ohms
  • Frequency response: 13Hz-35kHz -1dB
  • Output gain: via autoformer based gain selector
    6 position in 3dB increments
  • Total harmonic distortion: 0.05% @ 1V output
  • AC Power Requirements : 117/220/230/240 volts (factory wired)
  • Fuse 1 amp fast blow x2
  • Tube lineup : 2x 6SN7 or 5814/ECC82(12AU7)×2
  • Dimensions :
       Overall: 17" Wide x 15" Deep x 12" High
       Main Chassis: 17" W x 15" D x 7.5" H
       Power Supply: 17" W x 15" D x 4.5" H
  • Net Weight :
  • Shipping weight:
Main Features
  • 0 dB negative feedback
  • Pure tube design (no transistors)
  • 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 
  • AVC – “autoformer volume control”, 2 channels / 61 steps @ 1dB ea.
  • Autoformer based, 6 position output gain selector
  • Relay based source selector
  • No common ground between any inputs.
  • 100% point to point wired - NO PCB
  • Special ROHS silver solder used for the best electrical connection
  • Selector switch engages relays located near RCA jacks to switch all inputs
  • 2x 6SN7 or 12AU7 tubes for stereo line-amplification ( tube life > 10000 hrs )
  • Supplied with Sophia 6SN7 tubes
  • Highly regulated DC filament supply for signal tubes (separate power supply per tube)
  • Balanced Silver output transformers (Custom made for Purity Audio Design) - Silver Statement
  • Balanced Silver input transformers (Custom made for Purity Audio Design) - Silver Statement
  • Balanced Copper output transformers (Custom made for Purity Audio Design) - Statement
  • Balanced Copper input transformers - Statement
  • Highest quality Duelund Cast output coupling capacitors
  • V-Cap CUTF inner stage coupling capacitors
  • Premium AirLok signal cable uses ultra pure Silver
  • Bybee Purifiers installed in signal path in Ultra GT
  • Twin chamber analog chassis design separated by copper lined aluminum effectively fights against RFI and EMI.
  • RCA high quality Teflon silver input jacks
  • 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)
  • All 4 sets of outputs active at all times allowing for multiple configurations for bi-amping or use of an active subwoofer(s)
  • Neutrik/Swiss - XLR chassis connectors
  • Remote Control for Volume, Balance, Mute, Phase Reverse & display off
  • Herbie's Audio Labs Tenderfeet
  • All front & rear panel descriptions are laser engraved
  • Chassis finish: Black
  • Solid aluminum remote handset
  • Made in USA
  • Three years parts and labor warranty. 90 days on supplied tubes


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