Technical Specification


Unit Weight: 

  • 22 lbs [9.97 kg]

Unit Dimensions: 

  • 17” x 14” x 4” [ 36cm x 43cm x 10cm]

Shipping Weight: 

  • 31 lbs [14 kg]

Shipping Dimensions: 

  • 20.5”x 24” x 10” [52cm x 61cm x 25cm]


Power requirements

Input Power: 

  • Model specific 100VAC, 120VAC, or 230VAC 50 or 60Hz

Power Consumption: 

  • 60W


Audio inputs

Coaxial RCA single ended: 

  • 5

XLR Balanced: 

  • 5

Input Impedance: 

  • 33KΩ minimum

Unbalanced (RCA): 

  • 66KΩ minimum

Balanced (XLR)


  • Unbalanced 1.3V/33KΩ
  • Balanced 1.3V/66KΩ


Audio Outputs

Coaxial RCA single ended: 

  • 2

XLR Balanced: 

  • 2


Analog Audio Output

Output level: 

  • 4.0 Vrms

Output Impedance: 

  • <100Ω

Frequency Response

  • 20-20KHz:  +/- 0.1dB

THD&IM @ 1KHz (full scale): 

  • <0.03%


  • -3dB 0.1Hz - 200kHz


DC Triggers


  • 2


Headphone Performance

Output Power:

  • 300Ω:  >200mW
  • 16Ω:   >4.0 Watts

S/N Ratio: 

  • >90dB (1KHz)

THD & IM 1 volt out: 

  • <0.02%

Output Impedance: 

  • <0.5Ω

Overview & Features

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

PS Audio BHKsignature

Pre Amplifier

Midland HiFi Studio - Key Information


"Our reference pre-amplifier. We cannot believe how this unit out does so many units costing twice to three times the price.


The sheer reality and palpability of the instruments and voices has to be heard to be believed."

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