Dynaco ST-150 Stereo Amplifier

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230v

The Dynaco Stereo 150 is a basic two channel
power amplifier employing all silicon
semiconductors.

They include 24 transistors, 2 zener diodes, 16
diodes, and 2 thermal sensors. The output
circuitry is of the full complementary
symmetry design. The entire amplifier, except
for an input network, is direct coupled.

It's measured distortion levels approach the
threshold of much laboratory test equipment,
not only at the commonly specified full power
ratings, but more importantly at very low
power outputs as well.

This is the result of circuit techniques which
eliminate any discernible crossover notch at
low levels, and contributes to the Stereo 150's
freedom from listening fatigue.

It's accurate, uncoloured sonics have been
achieved on a wide variety of loudspeaker
loads, including electrostatics and multiple
drivers with complex crossovers.

The design of a very fine power amplifier
implies the necessity of several protection
techniques for the amplifier, and for the
speaker load. In addition to the AC line fuse,
four separate B+ fuses are supplied.

Electronic volt-amp limiting ensures safe
operation of the output transistors, and a
thermal sensor mounted directly on each
output stage reduces the input if high
temperature occurs.

An unusually large radiating area for the heat
fins, which are coupled to an aluminium back
panel, form a highly efficient heat sink.
Speaker fuses protect the load.

The Stereo 150 has been designed as two
independent 75 watts (at 8 ohms) amplifying
channels with a common power supply having
a high degree of inherent regulation.

In addition, where higher powers or higher
volt-amp capabilities are required for lower
load impedances, easy internal restrapping
permits monophonic operation for 150 watts
output (at 8 ohms).

An accessory kit is planned at additional cost
for two output meters and meter switching,
which includes alternative inserts for the front
panel.

Specifications
Power output: 75 watts per channel into 8Ω
(stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.25%

Damping factor: 50

Input sensitivity: 1V

Signal to noise ratio: 95dB

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 24 x transistors, 2 x zener
diodes, 16 x diodes, 2 x thermal sensors

Dimensions: 14.5 x 13.75 x 7 inches

Weight: 29lbs