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Designer’s Note from Bill Dudleston
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PowerBloc5 is a carefully engineered state-of-the-art amplifier.
The modular design allows for great flexibility.
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Each of PowerBloc5’s channels are seperate discrete circuits.
The only circuit they share is the main power supply.
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The use of AC and DC coupled inputs allows purity of signal.
Purists will be glad to know that only the DC coupling has a DC
blocking capacitor.
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The PowerBloc5 is the perfect home theater amplifier.
Whether you use the PowerBloc5 for your 5.1 system or if you
use the amplifier for surround channels in a 6.1 or 7.1 systems
you’ll appreciate its 200 watt per channel capacity.
The Legacy PowerBloc5 is designed with the same level of
thouroughness usually reserved for the finest amplifier gain
stages. Differential voltage gain throughout provides exceptional
rejection of external noise and contributes to the inherent DC
stability of the circuit.This allows direct coupling without servo
circuitry.The unit also uses output followers operating without
feedback.
The front end is designed to provide a slew rate of 50 V/µs.
This combined with excellent high frequency design insures
linear operation at high speed.The supply takes a very direct
approach to high performance. A single top quality 1700 VA
toroidal transformer and about 40,000 µF of total capacitance
with very low ESR and inductance is used.
The current stage is capable of producing peak currents in
excess of 50 peak Amperes with a degree of linearity and speed
which is not matched by other designs when producing only a
fraction of this current.This is achieved by the implementation of
several distinct circuit features.
The PowerBloc5 employs 5 modular amplifiers. Each channel
uses 10 hand-matched individual bipolar output transistors with a
combined power rating of 2000 watts and 75 Amperes per
channel with a bandwidth of 10 MHz.
AC (or cap coupled) inputs along with DC inputs are
provided. Cap coupling provides isolation from unwanted DC
signals from source equipment such as some DACs and tube
preamps. DC inputs allow passage of very low sub bass signals
necessary for proper surround sound applications.
