PS Audio BHK Mono 300 Signature Series Mono Amplifier (Pair)


BHK SeriesPS Audio

The audio performance and build quality of the Signature 300 series has been refined, honed, and polished over the past half century of design work by industry legend, Bascom H. King.


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If there is a better performing power amplifier anywhere in the world, we are unaware of it. The BHK Signature 300 Monoblock designs are built upon two proven topologies: a zero-loss vacuum tube input stage coupled to a high bias differentially balanced MOSFET output. If you are uncomfortable with compromise and seek the finest performance, reliability, and build quality, the BHK Signature 300 series is a perfect fit.

    • Zero-loss parallel vacuum tube input stage
    • Fully paralleled inside (not like a traditional bridged approach)
    • Differentially coupled, paralleled, balanced MOSFET output stage
    • All through hole construction (no surface mount parts)
    • RCA Single ended input
    • XLR balanced input
    • 300 watts 8Ω
    • 600 watts 4Ω
    • 1000 watts 2Ω
    • 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


BHK Signature 250 Stereo and BHK Signature 300 Mono
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] Color Options: Black
Voltage Options: Europe/Asia/Australia/New Zealand: 230V
Mains Power Inputs: IEC C14
Fuse Compliment all Countries: 4 – 10 amp fast blow H-Rated 5x20mm Rail Fuses
Fuse Compliment Mains
Audio Inputs: RCA (Unbalanced)
XLR (Balanced)
Speaker Outputs Signature 300 Gold plated copper binding posts (2 pair)
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

Gain:30.5dB +/-0.5dB
Sensitivity for rated output power of 250 watts into 8Ω: 1.3V
Noise: 100-20KHz <-85dBV
Input impedance Signature 300 mono: Unbalanced 50KΩ
Balanced 100KΩ
Output Impedance: 50Hz, 2.8VRMS <0.1Ω
Frequency Response: @2.8VRMS
10Hz – 20KHz +/- 0.1dB
10Hz – 200KHz +0.1/-3.0dB
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
1kHz, 1% THD
8Ω: 300W minimum
4Ω: 600W minimum
Damping factor: >350

Additional information


Black, Silver


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