The audio performance and build quality of the Signature 300 series has been refined, honed, and polished over the past half century of design work by industry legend, Bascom H. King. If there is a better performing power amplifier anywhere in the world, we are unaware of it. The BHK Signature 300 Monoblock designs are built upon two proven topologies: a zero-loss vacuum tube input stage coupled to a high bias differentially balanced MOSFET output. If you are uncomfortable with compromise and seek the finest performance, reliability, and build quality, the BHK Signature 300 series is a perfect fit.

Features:

• 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

Available in Black or Silver.

Specifications:

• Unit Weight:  83 lbs [37.6 kg] / Shipping Weight:  92 lbs [41.7 kg]
• Unit Dimensions:  17.1” x 8.7” x 14” Chassis only. 15" deep including connectors.
• 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:
• 100vac 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
• 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

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 Signature 300 mono:  Unbalanced 50KΩ,  Balanced 100KΩ
• 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)

Signature 300 Mono Amplifier:

• Output Power:  120vac mains, 1kHz, 1% THD
• 8Ω:  300W minimum
• 4Ω:  600W minimum
• 2Ω:  1000W
• Damping factor:  >350