New from Blue Circle's Black Projects Division (Gilbert's design corner) is the BC206
hybrid stereo amplifier. The BC206 was conceived with the idea of approaching the
refinement that, up to now, has only been available in the AG8000 but in a more compact
single chassis design. The '206 is not the equal of the AG8000s but it is a big
step in bridging the gap between the BC8s and the AG8000 amplifiers.
180 watts per channel into 8 ohms and 360 watts into 4ohms output.
true balanced from input to output with both positive and negative being "hot."
DC coupled output stage.
local "on board" hybrid, polypropylene, high speed electrolytic filtering capacitors
located less than one inch away from the output devices for better transient response.
all control circuits are done in the analog domain therefore there is no digital
clock to contaminate the analog signal integrity...it's an analog amp after all.
heavy gauge power supply ground return path for both tube and output stages. This
results in the exact same reference for both tube and output stages to yield the
best matching performance.
carefully laid out "T" ground path to isolate sensitive tube circuits from power
20 amp Neutrik "Power Con' power connector for optimum connectivity of AC power.
BC62 (10 AWG ) power cord with Hubbell hospital grade plug. The standard length is
4 ft. Longer lengths are available to suit specific customer requirements.
all internal AC power is controlled by 30A AC power relays for the shortest AC power
run inside the chassis. This eleminates the need to have the AC line run to the front
and back with the resulting possibility of "leaks" to the signal path.
1300VA power transformer supply for output stage only.
three sepearate power transformers for out put stage, tube input stage and controls.
over 375,000uF in power supply filtering.
power Hexfred rectifiers in both output stage and B+ supply.
12Ga steel chassis for mechanical integrity.
1 1/4" thick MDF base tightly coupled to the chassis for ultra rigid damping control.
cover damped internally to minimize resonance.
two pairs of binding posts per channel for shotgun bi-wiring.
RCA and XLR inputs
ground lift switch to eleminate ground loops. This switch will only lift the signal
ground. The chassis is connected to earth ground at all times for safety.
dimensions: 13" wide x 18.125" high x 31.75" deep.
weight: 118 lbs without packaging.
Measurements, including tube input stage (measured with matched tubes):
residual noise reference to full power output: >-100dB or <300 uV non weighted.
residual noise reference to full power output: >-110dB or <150 uV within audio band.
tracking error: < +/- 0.09dB.
frequency response (10W into 8 ohms): 10Hz to 35K + 0.00db -0.05 dB; -0.9dB point
at > 100kHz.
distortion at 10 W into 8 ohms < 0.09%.
voltage gain: 21.5 dB.
input sensitivity: 3.19 V.
Output stage measurements:
residual noise reference to full power output: >-100dB or <250uV non weighted.
residual noise reference to full power output:>-112dB or <100uV within audio band.
tracking error:< +/- 0.025dB.
frequency response (10W into 8 ohms): 10Hz to 50K +0.00dB, -0.025dB; -0.5dB point