Dynamic Sounds Associates DSA AMP 1


Each Amp I produces 125 watts of pure Class A power and is of solid state design employing an all-JFET/MOSFET design using DC coupled circuit topology following a source follower input with blocking capacitors to provide a constant input impedance and prevent input DC offsets from damaging speakers.

The amplifier has no loop feedback in order to prevent transient intermodulation distortion and to provide a very wide power bandwidth without concern for output phase shifts caused
  
by speaker loading or amplifier time delay. The massive output driver uses 8 of the legendary Hitachi power MOSFETs in a push-pull configuration with a bias current of 3 amps to achieve 125W of Class A power output into an 8 ohm load.


Each unit has separate power transformers, power supplies and voltage regulators for the amplifier, driver, and output stages.

With internally mounted, fan cooled, power heat sinks, the small-footprint chassis: 17” (W) x 11”(D) x 18” (H) makes it easy to fit in any audio environment.

Design

An all-JFET/MOSFET design uses DC coupled circuit topology following a source follower input with blocking capacitors to provide a constant input impedance and prevent input DC offsets from damaging speakers.

No loop feedback in order to prevent transient intermodulation distortion and to provide a very wide power bandwidth without concern for output phase shifts caused by speaker loading or amplifier time delay.

Massive push-pull output configuration with a bias current of 3 amps to achieve 125W of Class A power output into an 8 ohm load.

Features

Legendary Hitachi power MOSFETs utilized in the output stage

Separate power transformers, power supplies and voltage regulators for the amplifier, driver, and output stages.

Output stage with 0.1F (100,000mF) of total filter capacitance including 80,000mF following the output stage voltage regulators

Small footprint 17” (W) x 11”(D) x 18” (H) makes it easy to fit in any audio environment. 


Innovations

The output stage is configured around two internally mounted heat sink “towers” cooled by ultra-low noise fans to provide many years of reliable operation

An ultra-low noise chassis fan provides air circulation to maintain a low internal ambient temperature.

The output DC offset voltage, output stage bias current and voltage can be monitored using a built in
volt meter behind the front panel hinged door.

Performance

125 watts class A into 8 ohms
-3dB power bandwidth > 200kHz

Throughput gain:

o Unbalanced Input – 25dB
o Balanced Input -- 25dB or 31dB (User selectable