BHK Signature 250
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PS Audio BHK Signature 250

Power Amplifier

Midland HiFi Studio - Key Information



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Overview & Features


When cost-no-object performance is the goal there are a rare handful of power amplifiers capable of transporting listeners into a musical space few are able to enjoy. The BHK Signature 250 is one such amplifier. Lush, gorgeous, powerful, revealing, hand built, perfect.


The BHK Signature 250 Stereo Power Amplifier culminates one man’s lifelong quest for perfection in power amplification. Bascom H. King’s magnum opus combines a vacuum tube input with a powerful MOSFET output capable of 250/500 watts per channel.  The BHK Signature 250 Stereo amplifier can drive any loudspeaker to musical perfection and is the most important element in your music reproduction chain.


Features


  • Zero-loss vacuum tube input stage
  • Differentially coupled balanced MOSFET output stage
  • All through hole construction (no surface mount parts)
  • RCA Single ended input
  • XLR balanced input
  • 250 watts per channel 8Ω Signature
  • 500 watts per channel 4Ω Signature
  • 2Ω stable Signature 250 stereo
  • Less than 0.1% thd 20Hz to 20kHz at rated power
  • Damping factor 100 for excellent loudspeaker control
  • Front panel standby button for vacuum tube input
  • -3dB greater than 200kHz
  • Dual, custom, solid copper, gold plated output binding posts
  • Fully balanced from input to output
  • 83 pounds
  • Input 12 volt trigger
  • Easy access for tubes

Technical Specification

Unit Weight

  • 83 lbs [37.6 kg]


Unit Dimensions

  • 17.1” x 8.7” x 14” Chassis only. 15" deep including connectors.


Shipping Weight

  • 92 lbs [41.7 kg]


Shipping Dimensions

21”x 13” x 19”


Color Options

  • Black
  • Silver


Mains Power Inputs

  • IEC C14


Fuse Compliment all Countries

  • 4 - 10 amp fast blow H-Rated 5x20mm Rail Fuses


230vac Countries

  • 1 - 1 amp slow blow H-rated 5x20mm
  • 1 - 5 amp slow blow H-rated 5x20mm


Accessories Included

  • UK (BS 1363) (230V version)


Audio Inputs

  • RCA (Unbalanced)
  • XLR (Balanced)


Speaker Outputs

  • Gold plated copper binding posts (2 pair per channel)


Other


DC Trigger Input

  • 3.5mm 5-15VDC


Warranty

  • 3 years parts and labor on unit
  • 1 year on vacuum tube


Power Consumption

  • @Ready - 75 Watts
  • @Idle - 175 Watts
  • @Rated power 8Ω - 850 Watts
  • @Rated power 4Ω - 1600 Watts


Signal


Gain

  • 30.5dB +/-0.5dB


Sensitivity for rated output power of 250 watts into 8Ω

  • 1.3V


Noise

  • 100-20KHz <-85dBV


Input impedance

  • Unbalanced 100KΩ
  • Balanced 200KΩ


Output Impedance

  • 50Hz, 2.8VRMS<0.1Ω


Frequency Response @2.8VRMS

  • 10Hz – 20KHz +/- 0.1dB
  • 10Hz – 200KHz +0.1/-3.0dB


THD&IM

  • 1KHz, 1W/8Ω<0.01%
  • 20-20KHz, 1W/8Ω<0.1%
  • 1KHz, 200W/8Ω< 0.1% (120VAC Mains input)
  • 1KHz, 400W/4Ω< 0.1% (120VAC Mains input)


Output Power (Both channels driven 120vac mains, 1kHz, 1% THD)

  • 8Ω:  250W minimum
  • 4Ω:  500W minimum
  • 2Ω:  Stable for musical transients
  • Damping factor:  >150