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BHK Signature 250

The BHK Signature 250 stereo power amplifier bears no witness to compromise. No construction details were overlooked, no performance weakness tolerated. This stereo power amplifier is the industry reference standard for performance—an investment grade musical instrument that brings music to life. The BHK Signature 250 stereo is 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 in a single-chassis format, the BHK Signature 250 is a perfect fit.

The BHK Signature 250 and 300 power amplifiers are the culmination of one man’s half-century search for perfection in music’s reproduction. Bascom H. King has designed amplifiers for many companies, some selling in excess of $100,000, including: Constellation Audio, Marantz, Infinity, and Conrad Johnson. This is the first amplifier Bascom felt was good enough to lend his name to. It is his finest achievement in a lifetime of work.Available in both stereo and mono models, the BHK Signature series is unparalleled in its ability to render details formerly lost in the music. The BHK Signature is a hybrid design enjoying performance benefits from multiple design techniques including, a balanced differential vacuum tube input, balanced differential MOSFET power outputs, and separate, isolated, analog power supplies feeding each.When it comes to musically controlling and powering loudspeakers, the BHK Signature has no peer. The stereo Signature 250 produces 250 watts/per channel into an eight-Ohm loudspeaker, 500 watts/channel into four-Ohms, and stable into 2-Ohms; enough power to satisfy even the hungriest of loads.The Mono Signature 300 doubles the output current with half the impedance of the stereo model. Each Mono Signature produces 300 watts into an eight-Ohm loudspeaker, 600 watts into four-Ohms, and 1000 watts into 2-Ohms.  But more than just doubling the current, the BHK Signature 300 also doubles every internal component of the 250 into one: double tubes, double power supplies, transistors, capacitors and resistors. The results are hard to put into words. The BHK Signature 300 is a clear step above the stereo 250, on the order of 20% better, though both have the same character of sound. Both the Stereo 250 and Mono 300 are one of the best performing, musical sounding amplifiers ever made. Imagine your delight listening to either. 

BHK Signature 250 Stereo Mono

Unit Weight83 lbs [37.6 kg]
Unit Dimensions17.1” x 8.7” x 14” Chassis only. 15" deep including connectors.
Shipping Weight92 lbs [41.7 kg]
Shipping Dimensions21”x 13” x 19”
Color OptionsBlack
Silver
Voltage Options
Factory set only
Japan 100V
North America 120V
Europe/Asia/Australia/New Zealand 230V
Mains Power InputsIEC C14
Fuse Compliment all Countries4 - 10 amp fast blow H-Rated 5x20mm Rail Fuses
Fuse Compliment Mains100vac Countries
1 - 2 amp slow blow H-rated 5x20mm
1 - 12 amp slow blow H-rated 5x20mm
120vac Countries
1 - 2 amp slow blow H-rated 5x20mm
1 - 10 amp slow blow H-rated 5x20mm
230vac Countries
1 - 1.6 amp slow blow H-rated 5x20mm
1 - 5 amp slow blow H-rated 5x20mm
Accessories IncludedUS (NEMA 5-15P) (all versions)
Schuko (CEE7/7) (230V version)
UK (BS 1363) (230V version)
Audio InputsRCA (Unbalanced)
XLR (Balanced)
Speaker Outputs Signature 250Gold plated copper binding posts (2 pair per channel)
Speaker Outputs Signature 300Gold plated copper binding posts (2 pair)
OtherDC Trigger Input 
3.5mm 5-15VDC
Warranty3 years parts and labor on unit
1 year on vacuum tube

Power Consumption

@Ready75 Watts
@Idle175 Watts
@Rated power 8Ω850 Watts
@Rated power 4Ω1600 Watts

Signal

Gain30.5dB +/-0.5dB
Sensitivity for rated output power of 250 watts into 8Ω1.3V
Noise100-20KHz <-85dBV
Input impedance Signature 250 stereoUnbalanced 100KΩ
Balanced 200KΩ
Input impedance Signature 300 monoUnbalanced 50KΩ
Balanced 100KΩ
Output Impedance50Hz, 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)

Signature 250 Stereo Amplifier

Output Power

Both channels driven 120vac mains, 1kHz, 1% THD
8Ω250W minimum
4Ω500W minimum
2ΩStable for musical transients
Damping factor>150


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