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BHK Signature Preamp and 250 Stereo Amp

Stereo Preamp and 250 Watt no compromise power amplifier

Built in Boulder
Save when you buy the BHK Preamp and Stereo 250 together

Magic happens when the components in the system are designed to work together. The designs of the BHK Signature amp and preamp combination have been lavished over and voiced to perfection over the past half-century of design work by industry legend, Bascom H. King. Only the combination of the BHK Signature Preamplifier and 300 Signature monoblock amplifiers can outperform this amazing combo of stereo amplifier and state of the art preamplifier. Trust the ears and intellect of BHK to combine the best of vacuum tubes and MOSFETS in this extraordinary handcrafted work of art, a system that is both accessible to many and magic to all who have a chance to listen. Bring both the majesty of music and the musicians themselves into your home with this gorgeous combination.

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BHK Preamp and BHK 250 Amp

Product Description

Stereo systems depend on the synergy between components to perform their magic. When everything’s crafted to work together, like the preamp and power amplifier, a kind of musical perfection can be reached that is unavailable with cobbled together components. The BHK Signature stereo combination offers accessible performance excellence with a control and power component combination that’s nearly unbeatable. Expect your system to come alive with the musicians in the room while your loudspeakers disappear.

Place the BHK Signature Preamplifier between your musical sources, such as a phono preamp, DAC, tuner or auxiliary source and the BHK 250 stereo amplifier and prepare to be wowed with deeper, wider sound staging, significantly improved separation of instruments and voices, subterranean bass, extended highs, and an openness you have yet to experience without this handcrafted system delivering your music.

The BHK Signature Preamp and 250 stereo power amplifier culminates one man’s lifelong quest to create the finest accessible Pre and Power amplifier system. By combining our more accessible 250 stereo amplifier and Bascom H. King’s magnum opus vacuum tube and MOSFET preamplifier together in this amazing synergistic combination, any highly resolving loudspeaker pair will come alive in ways that are immediately obvious and musically satisfying.

This product qualifies for our risk free in-home trial in the continental United States when purchased directly from PS Audio. And, trade in and save. Let us repurchase your old equipment at its full and original retail price. We’ll give it a good home and make sure you have the best power in the world. Just click the green Trade Up and Save button above these words to take advantage.

The BHK Signature Preamplifier

  • Zero-loss vacuum tube input stage
  • User accessible switch allows both 12 volt and 6 volt tubes to be used
  • Differentially coupled balanced MOSFET output stage
  • All through hole construction (no surface mount parts)
  • PRP resistors in signal path
  • 5 RCA Single ended inputs
  • 5 XLR balanced inputs
  • Single ended and balanced outputs
  • Single ended and balanced outputs can be used together or separate
  • Fully balanced input to output
  • High current oversized power transformer
  • Fully regulated power supplies using BHK designed MOSFET discrete voltage regulators
  • Full BHK designed zero feedback, discrete MOSFET headphone stage
  • Remote control
  • Front panel standby button for vacuum tube stage
  • -3dB greater than 200kHz
  • Volume and balance through a revolutionary new combination of gain and attenuation control
  • Two output DC control triggers
  • Easy access to tubes if you want to roll with different ones
  • Each input can be configured as a HT bypass

The BHK Signature 250 Power Amplifier

  • 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

Stereo Times

Frank Alles

I confess I have no criticism of the BHK 250’s sonic performance—only high praise. It is extended and detailed at both frequency extremes and has an immediate, musical, and open sounding midrange (all qualities I love)….

Although the PS Audio BHK Signature 250 stereo amplifier is higher priced than most amplifiers I have used, for an amplifier of this pedigree and obvious premium quality I believe it is quite the bargain at its current $7,499 price tag. In fact, I would seriously consider snapping one up while this price is still available.

So I think I will just buy this beastie and be thrilled with it! Very highly recommended!

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HiFi Plus

Eric Neff

Bascom, Paul, and Arnie’s combined 150 years of audio excellence has led to a design of classic physical beauty and sonic excellence that easily achieves the goal of competing with über-level amplifiers, but at a fraction of the retail price. As audiophiles, we sometimes fall into the ‘price equals performance’ trap. We fear being the emperor with no clothes when our friends ask how much we paid and it was, gasp! LESS than what flagship gear is supposed to cost. Naturally it must not be that good. This amp is that that rare Holy Grail whose sensible price belies its astounding performance. Hand built in America, it may well be your final amplifier purchase.

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The Absolute Sound

Anthony Cordesman

They have truly exceptional imaging, depth, and natural soundstage width, and they really can get the best out of the naturally miked and produced recordings that have a real-world soundstage. The 300s’ dynamics are extraordinary, particularly in the lower octaves that seem to be in even more demand for audio reproduction today than the upper octaves.

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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.

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Positive Feedback

Dave Clark

I can't recommend the BHK 250 enough. Like I said I bought this one and it is now here between the speakers with the Claytons off on a rack. I won't sell the Claytons ever and for sure they will eventually find their way back into the system.

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Fedeltà del Suono

Giulio Salvioni

The PS Audio BHK Signature 250 has everything that one would expect from a power amplifier of this category: it’s powerful, fast, accurate, gentle regarding its ability to convey the harmonic complexity of even the most difficult audio tracks and has a great dynamic reserve. Its ability to recreate a coherent and well focused soundstage puts this product among the best power amplifiers regarding this parameter. I could go on for a while extrapolating specific parameters and writing about how well the BHK behaved respect to them, but it would be useless. In my opinion the ultimate reason of the beauty of this poweramp is the ability to translate all these individual elements into a performance that is, at the same time, musically coherent and effective. All this at a cost that must be considered extraordinarily competitive.

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Audio Video Magazine

Deon Schoeman

Yes, it's all things you'd expect from a top flight amplifier: powerful and precise, fast and dynamic, generous in its staging, and close in its focus. But its ability to translate those elements into a musically coherent and consistently compelling performance is what sets the BHK Signature apart from any other power amplifier I've listened to. I sense a classic in the making.

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Unit Weight22 lbs [9.97 kg]
Unit Dimensions17” x 14” x 4” [ 36cm x 43cm x 10cm]
Shipping Weight31 lbs [14 kg]
Shipping Dimensions20.5”x 24” x 10” [52cm x 61cm x 25cm]

Power requirements

Input PowerModel specific 100VAC, 120VAC, or 230VAC 50 or 60Hz
Power Consumption60W

Audio inputs

Coaxial RCA single ended
XLR Balanced
Input Impedance
Unbalanced (RCA)
Balanced (XLR)
33KΩ minimum
66KΩ minimum
SensitivityUnbalanced 1.3V/33KΩ
Balanced 1.3V/66KΩ

Audio Outputs

Coaxial RCA single ended
XLR Balanced

Analog Audio Output

Output level4.0 Vrms
Output Impedance<100Ω
Frequency Response
+/- 0.1dB
THD&IM @ 1KHz (full scale)<0.03%
Bandwidth-3dB 0.1Hz - 200kHz

DC Triggers


Headphone Performance

Output Power
16Ω >
4.0 Watts
S/N Ratio>90dB (1KHz)
THD & IM 1 volt out<0.02%
Output Impedance<0.5Ω

BHK Signature 250 Stereo and BHK Signature 300 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
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


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


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
2Ω Stable for musical transients
Damping factor>150

Signature 300 Mono Amplifier

Output Power

120vac mains, 1kHz, 1% THD
8Ω300W minimum
4Ω600W minimum
2Ω 1000W
Damping factor>350


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