PS Audio BHK Signature 300 Mono Amplifier (Mono Pair)
PS Audio HiFi components are now available for audition on the Gold Coast, please contact us at GC HiFi to arrange your own private listening session.
The BHK Signature 300 Mono power amplifier culminates one man’s lifelong quest for perfection in power amplification. 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 8, 600 into 4 and more than 1,000 watts into 2. The BHK Signature 300 amplifier can drive any loudspeaker to musical perfection and is the most important element in your music reproduction chain.
Compared to the BHK Signature 250 Stereo power amplifier, 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 easily twice as clear, twice as open, significantly more musical than its stereo counterpart. And what is truly remarkable is the Signature 250 is one of the best performing, musical sounding amplifiers ever made. Imagine your delight listening to either.
- 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
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 complimentary design.
Unit Weight: 83 lbs
Unit Dimensions: 17.1” x 8.7” x 14” Chassis only. 15″ deep including connectors.
Shipping Weight: 92 lbs
Shipping Dimensions: 21”x 13” x 19”
Color Options: Black Silver
Voltage Options Factory set only: Japan 100V North America 120V Europe/Asia/Australia/New Zealand 230V
Mains Power Inputs: IEC C14
Fuse Compliment all Countries: 4 – 10 amp fast blow H-Rated 5x20mm Rail Fuses
Fuse Compliment Mains: 230vac Countries (1 – 1 amp slow blow H-rated 5x20mm) (1 – 5 amp slow blow H-rated 5x20mm)
Audio Inputs: RCA (Unbalanced) XLR (Balanced)
Speaker Outputs Signature 300: Gold plated copper binding posts (2 pair)
Other: DC Trigger Input, 3.5mm 5-15VDC
Warranty: 3 years parts and labor on unit, 1 year on vacuum tube
Gain: 30.5dB +/-0.5dB
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: 1KHz, 1W/8Ω <0.01%, 20-20KHz, 1W/8Ω <0.1%, 1KHz, 200W/8Ω
Signature 300 Mono Amplifier
Output Power 120vac mains, 1kHz, 1% THD
8Ω 300W minimum
4Ω 600W minimum