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HomeHiFi EquipmentAmplifiers PS Audio BHK 300 Signature Mono Amplifiers
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PS Audio BHK 300 Signature Mono Amplifiers

£15,000.00

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.

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Description
  • 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
  • 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

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.

The power amplifier is technology always present in stereo systems. Yet, despite the fact everyone uses them, few 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.

The BHK Signature power amplifiers are unique in their ability to faithfully pass even the tiniest of details. The first listen to the BHK is like pulling a blanket off the loudspeakers. Suddenly revealed are the tiniest of details that now ring clear through the BHK, perfectly preserved through its extraordinary bandwidth, low feedback, vacuum tube and MOSFET design.

The input stage is a critical interface

The connection between preamplifier and power amplifier is critical, for it is at this junction where most essential musical details are easily lost. 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 the massive power output stage inside the BHK Signature. The input stage’s seemingly impossible task of passing both delicate and powerful musical information without loss is made possible by massive numbers of free flowing electrons traveling within the BHK’s vacuum tube; electrons quantities that are not to be found in transistors.

Used as the interface between the preamplifier and the input stage of a power amplifier, tubes have no peer. Invented by Fleming in 1904, and refined by deForest in 1906, the vacuum tube is unique amongst amplification devices: it boils an abundance of free electrons in empty space while modern devices pull fixed numbers through solids. A tube’s high voltage, empty space, rich numbers of electrons and connection through unattached fields preserves details lost in the solidity of silicon. Tubes are the perfect interface between sources and power stages.

The BHK Signature input features a classic triode vacuum tube in a modern configuration. Hand matched pairs of Russian Gold Lion 6922s are self-biased with constant current and high voltage, free of timing and phase distortion without the use of negative feedback. They provide the perfect interface between the delicate musical transitions output by the DAC or preamplifier, and are electrically isolated from the BHK power output stage which is connected to the loudspeaker.

The hybrid approach used in the BHK Signature takes advantage of the best traits technology has to offer, unavailable in traditional solid state or tube designs. While vacuum tubes are the perfect input stage, they cannot make the same claim on a power amplifier’s output. Conversely, solid state designs are correct for output stages, but suffer when used as inputs. Only a hybrid approach takes advantage of the best in both disciplines.

A power amplifier connects its reservoir of energy to the loudspeaker through a type of valve (solid state or vacuum tube) controlled by the input stage. If the input stage has done a good job of preserving music’s subtle details, textures, timing and phase information, transferring it without loss to the power stage and eventually the loudspeakers is best handled by a tube-like solid state device known as a MOSFET.

MOSFETs handle power without the additional circuitry needed by tube power amplifiers, and they sound better than tubes or their solid state alternatives, bipolar transistors. Field effect transistors were first invented by Julius Edgar Lilienfeld in 1925 and because they require very little current and operate with an invisible field, their sound is more closely related to vacuum tubes than transistors, without suffering any of the issues driving loudspeakers typical of vacuum tube power amplifiers.

Not all MOSFETs are the same, their differences characterized by their relationship with the input signal and the power supply driving them: N-types for the positive going signals, P-types for negative. It turns out that N-types have lower distortion and perform better than P-types. Despite this anomaly most power amplifier designs use both types of transistor in a configuration known as complementary symmetry. The BHK takes a different approach, one that avoids the problem of uneven performance between N and P devices altogether. Using only N Channel MOSFETS in its output stage, the BHK Signature produces a near-perfect balanced waveform without the degradation inherent in a complementary design.

Work on the BHK Signature began in 2014 with the goal of building one of the top five power amplifiers in the world, regardless of price. Bascom H. King took the charge under the condition he be permitted to design and build the amplifier his way, without restriction and that is what happened.

Starting with a clean slate, he reimagined the traditional transistor and tube based amplifier as a hybrid, with vacuum tubes on its input and transistors on its output, an idea invented by him thirty years ago. In 1979 Bascom had designed the Infinity Class A, the world’s first hybrid power amplifier, with tubes for inputs and transistors for outputs. Its success was great and reviewer J. Gordon Holt, founder of Stereophile magazine wrote: “it is the best sounding amplifier I have ever heard.”

To maximize the benefits of the two amplification topologies inside the amplifier, it should be built as if it were two separate systems, each with their own power supply tailored to fit. Thus, the BHK Signature has two power transformers, one for the vacuum tube input stage, the other for the MOSFET power output stage. Regulation of the power supply for the input stage is important. Separate and discrete MOSFET regulators are used throughout to preserve details found in the music and keep noise levels to a minimum.

The path music takes through the amplifier must be pure and without a polluting sonic signature. Each passive component is hand selected to provide the cleanest path possible. PRP resistors, film and foil Rel Caps, and the finest sounding parts possible are hand soldered onto BHKs circuit boards. Bascom had insisted no surface mount parts be used in the signal path.

No expense was spared on the BHK. Even the output connectors are custom machined out of copper then polished and gold plated for best connection.

The BHK Signature 250 stereo amplifier, and the BHK Signature 300 Mono Amplifier embody one man’s life’s work and passion in the art of amplification. That these monuments to music can be offered to music lovers for less than $50,000 each is a testament to the years of experience invested in their design; that they are significantly less than $10,000 is a miracle.

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Audiophile Masters Vol 1 – PS Audio Gold SACD

£55.00
A stunning new collection of great music and breathtaking recordings direct from the DSD masters.
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Bach Cello Suites – PS Audio Gold SACD

£89.95
""Stunning!" The six unaccompanied cello suites are a cornerstone of the classical cello repertoire.”
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Clearaudio Smart Matrix Silent Record Cleaning Machine

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Clearaudio’s ‘Matrix’ record cleaners have long been renowned for their gentle yet highly effective vacuum cleaning capabilities. Shhh… the new Smart Matrix Silent is the quietly elegant, and impressively user-friendly, successor to the brand’s earlier Smart Matrix Professional modEL. Please check with us about availability before ordering.  
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Don Grusin – Out of Thin Air – PS Audio 180G Collectors Vinyl

£89.95
Just released. A limited-edition, individually numbered, 180-gram collector’s vinyl. These won’t be around long.
An original recording from piano master Don Grusin. It’s a sonic stunner. Nothing short of amazing, both musically and sonically.
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FoxFeather The Nature of Things – PS Audio Gold SACD

£55.00
"Carly Ricks Smith’s voice is unforgettable, a wonderful cross between the folky soprano of a young Joni Mitchell and the jazz-heavy range of Lake Street Dive’s Rachel Price.”
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Gabriel Mervine – Say Somethin’ PS Audio Gold 180g Vinyl

£89.95
Just released. A limited-edition, individually numbered, 180-gram collector’s vinyl. These won’t be around long.
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Gabriel Mervine Say Somethin – PS Audio Gold SACD

£50.00
From one of the best jazz quartets in town comes a spectacular Audiophile Master, Say Somethin’ from trumpeter Gabriel Mervine. Without question, one of the best jazz recordings yet made, this wonderful Octave Records release will help set the standard for how an intimate musical session can sound.
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Otis Taylor – Hey Joe Opus Gold SACD

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Otis Taylor is a national treasure. A brilliant musician captured in high definition audio for all to enjoy.
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PS AUDIO BHK SIGNATURE 250 STEREO POWER AMPLIFIER

£8,000.00
The BHK Signature 250 stereo amplifier, and the BHK Signature 300 Mono Amplifier embody one man’s life’s work and passion in the art of amplification. That these monuments to music can be offered to music lovers for less than £50,000 each is a testament to the years of experience invested in their design; that they are significantly less than £10,000 is a miracle.
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PS Audio BHK Signature Pre-Amplifier

£6,000.00
Designed by Bascom H. King, the BHK Signature distills Bascom’s 50 plus years of high-end audio design experience into a single masterpiece of audio amplification. “This is the best sounding preamplifier I have ever designed or heard,” and that’s saying a lot for a man of Bascom’s experience.
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PS Audio Dectet Power Center

£799.00
  • BACK IN STOCK
  • 10 way extension block
  • Each outlet hand wired
  • Star earthed
  • Requires a mains lead
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PS Audio Dectet Power Center EU Schuko Sockets

£525.00
  • 10 way extension block
  • Fully star earthed
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PS Audio Dectet Power Center with FREE MCRU No.5 Power Lead

£799.00
  • Free No.5 worth £200
  • No other offers apply
  • 10 way extension block
  • Each outlet hand wired
  • Star earthed
  • Requires a mains lead
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PS Audio DirectStream DAC + Streamer

£5,500.00 – £6,400.00
  • BLACK ONLY AVAILABLE
  • Pure 100% DSD based D to A Converter
  • Up-samples PCM and DSD to 10x DSD rate
  • DXD support
  • Purely passive transformer coupled output
  • Simple, direct signal path with one master clock
  • Hand written filters, processors and upsamplers
  • Immune to incoming jitter problems from different sources
  • No off-the-shelf IC DAC chips used
  • Fully balanced from input to output
  • Color touch screen
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Weight 30 kg
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Black, Silver

Brand

PS Audio

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Pass Labs XA25 Stereo Power Amplifier

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Townshend Audio Allegri+ Pre-amplifier

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  • The Allegri+ Passive Autotransformer preamp is exceptionally transparent, has absolutely no noise and has enormously wide bandwidth.
It has vanishingly low distortion, very powerful and deep bass and amazing drive throughout the audio band. Treble is crystal clear with not a hint of hardness or brashness. It just sounds right!
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IsoTek EVO3 Sigmas Mains Conditioner

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  • IN STOCK
  • Suitable for all audio or AV systems
  • RFI reduction 75dB
  • 6 optimised power cleaning circuits Removes Common and Differential Mode mains noise
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PS Audio Stellar M700 Stereo Power Amplifiers (Pair)

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  • Enjoy an unheard of level of control and command from your loudspeakers with the Stellar M700, one of the most extraordinary under £5,000 power amplifier pair ever crafted. The M700 combines the slam, linearity, control and pacing of a Class D output stage with the warmth, grace, and rich inner detail of Stellar’s Class A Analog Cell. The results are nothing short of breathtaking. Liberate all the toe-tapping energy trapped in your media library. Plumb music’s subterranean depths as your system gives you more bottom end than you thought possible. Revel in rich layers of fine, full detail. Marvel at the deep, extraordinary, wall-to-wall soundstage. Control your loudspeakers as never before. Effortless. Lush. Stellar.
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PS Audio DirectStream DAC + Streamer

£5,500.00 – £6,400.00
  • BLACK ONLY AVAILABLE
  • Pure 100% DSD based D to A Converter
  • Up-samples PCM and DSD to 10x DSD rate
  • DXD support
  • Purely passive transformer coupled output
  • Simple, direct signal path with one master clock
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  • Immune to incoming jitter problems from different sources
  • No off-the-shelf IC DAC chips used
  • Fully balanced from input to output
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  • Oh no not another DAC!
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LAB12 INTERGRE4 AMPLIFIER

£3,250.00 – £3,695.00
• Choose KT150 or 6550 valves • EL34, KT88, KT120 compatible • Remote Control • Large OLED display • Blue Velvet ALPS motorized potentiometer • Connectivity and extendibility through I/O Upgrade Modules • Sophisticated protection and bias monitoring system • No feedback design • SRSG® implementation • Gold plated Teflon RCA connectors • Gold plated tube sockets • 5mm aluminum face panel with luxury painting • Five years guarantee
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Pass Labs INT-25 Integrated Amplifier

£7,195.00
At Pass Labs we build Fet amplifiers with excessive output stages, huge heat sinks and massive power supplies. We use the highest quality components in simple linear topologies, assembled and tested with care and subtlety. They measure well, sound great, and are reliable. Twenty plus years of ongoing innovation have kept the X and XA amplifiers at the forefront of high-end audio. The INT-25 embodies all this and less. A smaller stereo Class A amplifier at a lower price, it takes advantage of the lower power requirements to have simpler single-ended circuitry and fewer parts in the signal path. This also allows elimination of degeneration, “that other negative feedback” in all stages.
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Kerr Acoustic K100 Mk3 Loudspeaker

£22,995.00 – £27,495.00

Kerr Acoustic's reference loudspeaker - the K100 is a large format three-way design, featuring a twelve-inch Radial™ woofer partnered with a three-inch dome and true ribbon tweeter.

Offering an uncompromised frequency response from 16Hz to 45kHz, the K100 is a true reference monitor, designed to set the new standard in professional monitoring and critical listening.

All Satin & High Gloss models can be produced in any RAL colour at no extra cost.
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ShaknSpin Turntable Analyser

£240.00
  • Never seen before accuracy
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