BHK Signature 300 Mono Amplifiers
A forty year quest for musical perfection
“The first amplifier I gave up a lifetime obsession with tubes for” Arnie Nudell, founder, Infinity Systems.
Have you ever wanted to own the finest amplifier in the world but were scared off by a six-figure price tag? All that is about to change. The BHK Signature 300 Monoblock power amplifiers are a stunning achievement in power amplification and Bascom H. King’s finest work. Power amplifiers are the make-or-break component in the music reproduction chain. Everything in your system funnels into this critical component; anything lost can never be recovered. The BHK Signature 300 Monoblock features a zero-loss vacuum tube input stage coupled to a high bias differentially balanced MOSFET output. This amplifier is unmatched, in terms of sheer musicality, openness, tonal richness and accuracy, jaw dropping performance.
- 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
- 37 kgs
- Input 12 volt trigger
- Easy access for tubes
BHK Signature 250 Stereo and BHK Signature 300 Mono
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Unit Weight |
38 kgs |
Unit Dimensions |
17.1” x 8.7” x 14” Chassis only. 15" deep including connectors. |
Shipping Weight |
42 kgs |
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 |
100vac Countries 1 - 2 amp slow blow H-rated 5x20mm 1 - 12 amp slow blow H-rated 5x20mm 120vac Countries 1 - 1.6 amp slow blow H-rated 5x20mm 1 - 10 amp slow blow H-rated 5x20mm 230vac Countries 1 - 1 amp slow blow H-rated 5x20mm 1 - 5 amp slow blow H-rated 5x20mm |
Accessories Included |
US (NEMA 5-15P) (all versions) Schuko (CEE7/7) (230V version) UK (BS 1363) (230V version) |
Audio Inputs |
RCA (Unbalanced) XLR (Balanced) |
Speaker Outputs Signature 250 |
Gold plated copper binding posts (2 pair per channel) |
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
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@Ready |
75 Watts |
@Idle |
175 Watts |
@Rated power 8Ω |
850 Watts |
@Rated power 4Ω |
1600 Watts |
Signal
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Gain |
30.5dB +/-0.5dB |
Sensitivity for rated output power of 250 watts into 8Ω |
1.3V |
Noise |
100-20KHz <-85dBV |
Input impedance Signature 250 stereo |
Unbalanced 100KΩ Balanced 200KΩ |
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
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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) |
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Signature 250 Stereo Amplifier
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Output Power
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Both channels driven 120vac mains, 1kHz, 1% THD |
8Ω |
250W minimum |
4Ω |
500W minimum |
2Ω |
Stable for musical transients |
Signature 300 Mono Amplifier
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Output Power
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120vac mains, 1kHz, 1% THD |
8Ω |
300W minimum |
4Ω |
600W minimum |
2Ω |
1000W |