BHK Signature 250

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.


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



Mains Power Inputs


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)


DC Trigger Input

3.5mm 5-15VDC


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



30.5dB +/-0.5dB

Sensitivity for rated output power of 250 watts into 8Ω



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


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