19
Figure 12
Block Diagram of the
MC2301 Power Amplifier,
Protection Circuitry and
Power Supply
figuration cancels many forms of audible distortion
and greatly improves the Signal-to-Noise ratio of the
amplifier.
While conventional designs only take output from
the plate, the Patented Unity Coupled Power Ampli-
fier Circuitry takes the Power Output from both the
plate and cathode of the Power Output Tubes. This al-
lows for only one half of the turns ratio in the Output
Transformer used in conventional designs. The result
is much lower distortion, wider bandwidth and in-
creased loudspeaker damping factor. Refer to
figure 13.
The output signals of the two matched Patented
Unity Coupled Circuit Power Amplifiers operate in
a push-pull balanced circuit and are coupled together
in the unique McIntosh MC2301 Dual Core Output
Transformer. Refer to figure 14 on the next page. It
provides low distortion power transfer at frequen-
cies from below 20Hz to well beyond 20,000Hz with
optimum impedance points of two ohms, four ohms
and eight ohms. The unequaled expertise of McIntosh
in the design and manufacturing of transformers is
legendary in the high fidelity industry.
Precision metal film resistors and low dielectric ab-
sorption film capacitors are used in all critical circuit
locations. The circuit design of the MC2301 contrib-
utes to low operating temperatures using convection
cooling. No fans are needed.
Technical Description
Figure 13
