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BHK Signature Preamplifier

State of the Audio Art in musical preamplification

Built in Boulder
All units handmade in Boulder, Colorado.

Preamps can make or break a system; holding back rich details buried in the music. They are the critical link between sources and power amplifiers. Precious few of them–only a handful really–uncover, preserve and amplify the rich bloom of music. The BHK Signature Preamplifier is one of the rare few that brings out the magic.

“In my 50 plus years of reviewing, designing and just listening to music, I have never heard my system sound this open, dynamic and….magical…and the bass!” Bascom H. King

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BHK Signature Preamplifier

Product Description

Preamplifiers are the heart of any high-end music system controlling input selection, the critical first amplification stage, volume and balance functions, and the all important electrical isolation between sources and power amplifiers. Place the BHK Signature Preamplifier between your musical sources, such as a phono preamp, DAC, tuner or auxiliary source–and your power amplifier–and magic happens. Suddenly you are enveloped in a wealth of musicality you’ve not yet experienced: deeper, wider sound staging, improved separation of instruments and voices, Subterranean bass, extended highs, and an openness you have yet to experience without this instrument in the system.

This product qualifies for our risk free in-home trial in the continental United States when purchased directly from PS Audio. And, trade in and save. Let us repurchase your old equipment at its full and original retail price. We’ll give it a good home and make sure you have the best power in the world. Just click the green Trade Up and Save button above these words to take advantage.

  • Zero-loss vacuum tube input stage
  • User accessible switch allows both 12 volt and 6 volt tubes to be used
  • Differentially coupled balanced MOSFET output stage
  • All through hole construction (no surface mount parts)
  • PRP resistors in signal path
  • 5 RCA Single ended inputs
  • 5 XLR balanced inputs
  • Single ended and balanced outputs
  • Single ended and balanced outputs can be used together or separate
  • Fully balanced input to output
  • High current oversized power transformer
  • Fully regulated power supplies using BHK designed MOSFET discrete voltage regulators
  • Full BHK designed zero feedback, discrete MOSFET headphone stage
  • Remote control
  • Front panel standby button for vacuum tube stage
  • -3dB greater than 200kHz
  • Volume and balance through a revolutionary new combination of gain and attenuation control
  • Two output DC control triggers
  • Easy access to tubes if you want to roll with different ones
  • Each input can be configured as a HT bypass


Prairie Audio Man Cave

Juan C. Ayllon

...the Signature is the most transparent and neutral of the active preamps, giving added life and expression, but otherwise stepping out of the way of the music.

Bottom line, the PS Audio BHK Signature Preamplifier is the ultimate witness to the music: It tells the truth, the whole truth, and nothing but the truth!

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Jim Austin

PS Audio's BHK Signature preamp is one of the finest audio components I've had in my home. It didn't raise the dead, but it could conjure in my listening room the spirits of dead musicians, or fine facsimiles thereof. It didn't solve my problems, but it could sure distract me from them—and, with the right recordings, even trigger catharsis or philosophical insight.

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Erich Wetzel

In the BHK Signature preamplifier, Bascom H. King has designed, and PS Audio has built, an outstanding performer. It possesses the top-quality fit and finish that one would expect to get for $5999. Its sound was beautiful and alive, re-creating three-dimensional soundstages that were the largest I’ve heard in my room. Its excellent clarity of sound let me easily decipher even the most complex music, its bass was superbly firm, deep, and controlled, and its treble extension was clear and articulate.

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Karl Sigman

What the PS Audio BHK Signature Preamplifier brings to the table is a significant achievement. For me, it seals the deal, and I believe it will satisfy audiophiles on both sides of the aisle (digital versus analog, tubes versus solid state), and those in between. Taking into consideration its price, simplicity of use, extraordinary quality of sound, design and features such as an included internal headphone amp, I must honestly say, ‘There is no preamp like this preamp’. Very highly recommended.

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Positive Feedback

Dave Clark

Synergy and magic. Right now here in our listening room...Way deeper bass, way more open, way less whatever being in the way of our music… way more music. Dynamics… try My Disco's "1991" or anything from Lustmord. Happy times.

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Unit Weight22 lbs [9.97 kg]
Unit Dimensions17” x 14” x 4” [ 36cm x 43cm x 10cm]
Shipping Weight31 lbs [14 kg]
Shipping Dimensions20.5”x 24” x 10” [52cm x 61cm x 25cm]

Power requirements

Input PowerModel specific 100VAC, 120VAC, or 230VAC 50 or 60Hz
Power Consumption60W

Audio inputs

Coaxial RCA single ended
XLR Balanced
Input Impedance
Unbalanced (RCA)
Balanced (XLR)
33KΩ minimum
66KΩ minimum
SensitivityUnbalanced 1.3V/33KΩ
Balanced 1.3V/66KΩ

Audio Outputs

Coaxial RCA single ended
XLR Balanced

Analog Audio Output

Output level4.0 Vrms
Output Impedance<100Ω
Frequency Response
+/- 0.1dB
THD&IM @ 1KHz (full scale)<0.03%
Bandwidth-3dB 0.1Hz - 200kHz

DC Triggers


Headphone Performance

Output Power
16Ω >
4.0 Watts
S/N Ratio>90dB (1KHz)
THD & IM 1 volt out<0.02%
Output Impedance<0.5Ω


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