PS Audio BHK Signature 250 Hybrid Tube Power Amplifier

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Super clean and working absolutely like it should. Current generation and highly reviewed. MSRP $8249

Be sure to check out our matching BHK Signature Preamplifier by clicking here.

Comes with the original box for safe transport.

From a Stereophile review by the one and only Michael Fremer:
"The fact is, the BHK Signature 300 is a powerful, nimble-sounding amplifier that immediately drew me in with fast, punchy, tight bass; rich, liquid mids; and delicate, transparent highs—all effectively well integrated into a coherent whole."

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - XLR Interconnects

Kimber Kable - Speaker Cables - Good

Kimber Kable - Speaker Cables - Better

Kimber Kable - Bi-Wire Speaker Cables - Best

Kimber Kable - Power Cords - Good

Kimber Kable - 14AWG (Gauge) Power Cords - Better

Kimber Kable - 10AWG (Gauge) Power Cords - Best

More from PS Audio:
BHK Signature 250 Amplifier
The BHK 250 stereo power amplifier is an industry reference standard for performance—a 250 watt per channel investment grade musical instrument that brings life to music.
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. 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. 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.

DESIGN
Nothing in the design of a power amplifier is more important than its input stage when preserving music’s finest nuances. In the BHK Signature, a vacuum tube serves as the perfect interface between the preamplifier and MOSFET output stage. This hybrid approach offers stunning musical performance and unrivaled, effortless drive to the speaker. The Signature 250 Stereo Amplifier is the ultimate choice when a single chassis solution is required.

APPLICATION
The BHK Signature 250 Stereo Amplifier produces 250 watts/ 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. Use this amplifier as the bedrock of your high-performance audio or home theater system. The BHK 250 provides the finest performance, reliability and build quality possible, in a single chassis format.

The importance of the power amplifier in the 2-channel system chain cannot be overstated, yet it's often overlooked. It's the rare few music lovers that truly appreciate the power amp's critical role in preserving music's nuanced details, because most amplifiers fail to preserve them. Overtones from plucked instruments, subtle cues defining placement, depth, soundstage width, and transient decays are often lost in the power amplifier. Suddenly revealed are the tiniest of details that now ring clear through the BHK, perfectly preserved through its low feedback, vacuum tube and MOSFET design. When it comes to musically controlling and powering loudspeakers, the BHK Signature has few peers at any price. 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.

Signature 250 Stereo Amplifier Specifications:
Output Power
*Both channels driven 120vac mains, 1kHz, 1% THD
8Ω 250W minimum
4Ω 500W minimum
2Ω Stable for musical transients

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

Voltage Options
*Factory set only
North America 120V

Mains Power Inputs
IEC C14

Fuse Compliment all Countries
4 x 10 amp fast blow H-Rated 5 x 20mm Rail Fuses

Fuse Compliment Mains
120vac Countries
1 x 2 amp slow blow H-rated 5 x 20mm
1 x 10 amp slow blow H-rated 5 x 20mm

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

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)

PS Audio BHK Signature 250 Hybrid Tube Power Amplifier - Owners Manual

The SkyFi Testing Process for Preamplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.