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BHK Signature 300 Mono Amps and Signature Preamplifier

Our finest expression of musicality

Built in Boulder
Save when you buy the BHK Preamplifier and BHK 300 Mono Amplifiers 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. If there is a better performing combination of preamplifier and power amplifier anywhere in the world, we are unaware of it. 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 unlike any you have ever heard. Bring both the magic and the musicians into your home with this state-of-the-art combination.

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BHK Preamplifier and BHK 300 Amps

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 combination offers performance excellence unlike any control and power component combination in the world. Expect your system to come alive with the musicians in the room while your loudspeakers disappear. You are left transfixed by the performance, unaware of the equipment, with nothing but the music.

Place the BHK Signature Preamplifier between your musical sources, such as a phono preamp, DAC, tuner or auxiliary source and the BHK 300 mono amps 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 300 Mono power amplifier culminates one man’s lifelong quest to create the perfect Pre and Power amplifier combination. Bascom H. King’s magnum opus combines a pair of vacuum tubes on its input with a double set of parallel MOSFET outputs capable of 300 watts in 8Ω, 600 into 4Ω and more than 1,000 watts into 2Ω.  The BHK Signature 300 amplifier can drive any loudspeaker to musical perfection and is the most important element in your music reproduction chain.

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.

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
  • 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

BHK 300 Signature Monoblock amplifiers

  • 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

Parttime Audiophile

Rafe Arnott

“I’ve heard this amplifier in several systems…over the past couple years, and came away incredibly impressed on every occasion. An effortless presentation to every recording is a hallmark of PS Audio in my experience, with speed, dynamics, and an innately natural, unforced sound to everything from heavy metal, to intimate acoustic guitar solos. King seems to have harnessed the best of both worlds (tubes, and solid state) in this design, and the fact that it’s made in the USA by real people, for living wages is further proof of company founder Paul McGowan’s commitment to delivering high fidelity with integrity. When paired with the company’s pre-amplifiers, and power regenerators one takes the depth of lensing the recorded event ever further into the abyss of musicality. Powerful, authoritative, yet delicate, and organic, the Signature 300 strikes a balance not common in the audiophile world.”

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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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Stereophile Magazine

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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Hifizine

Patrick Dillon

When PS Audio decided to re-enter the amplifier market with a statement product, I am not sure even Paul McGowan anticipated what would result. That they have succeeded in creating something special is clear from my listening. The process of bringing on board a legendary designer and allowing him freedom to design to a sonic target while keeping costs in the realm of reasonable (ahem!) is more than mere advertising hype. At nearly $15k for a pair, these are not highly affordable products but they are superior to any amp I’ve heard in my room, or most other rooms for that matter. How many products can you say that about? Yep, these are the best I’ve heard, and by no small margin.

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Soundstage!

Erich Wetzel

PS Audio’s BHK Signature 300 Mono amplifiers produced wonderfully clear sound in my room, yet with a tangible, 3D quality that gave the music emerging from my speakers a bit more body -- which I really enjoyed. Their soundstaging was exceptional, and they proved unflappable throughout the listening period, despite being challenged with complex music and punishing volume levels. Their treble response was clean without sounding edgy, allowing me to enjoy longer listening sessions than I have with any other amp. I also appreciated the BHK Signatures’ tight-fisted bass reproduction, which delivered plenty of slam when the music called for it. While their looks may be bland, their build quality and tolerances of fit and finish were superb. The BHK Signature 300 Monos are expensive, but nothing in their build quality or sound makes me doubt that they’re worth every penny PS Audio asks for them -- or that they’re great amps.

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Hi Fi Statement

Dirk Somer

The BHK Signature 300 Amplifier are nothing less than world-class amplifiers: Sonically they leave nothing to be desired, as they combine in perfect style power and control with softness and emotion. And PS Audio circuit Bascom H. Kings packed in simple and well designed housing instead of aluminum sculptures, the Monos can decorate with an unprecedented low price / sound ratio: downright reasonable dream amplifiers!

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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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Physical

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
5
5
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
2
2

Analog Audio Output

Output level4.0 Vrms
Output Impedance<100Ω
Frequency Response
20-20KHz
+/- 0.1dB
THD&IM @ 1KHz (full scale)<0.03%
Bandwidth-3dB 0.1Hz - 200kHz

DC Triggers

+12V2

Headphone Performance

Output Power
300Ω
16Ω >
>200mW
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
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
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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