The output stages are matched to the load by the Mclntosh auto-
former. The Mclntosh autoformer is carefully wound using Mcln-
tosh trifilar winding and interleaving techniques. Trifilar winding
and interleaving gives the transformers exceptional bandwidth.
The autoformers properly match the power transistors to 4, 8, and
16 ohm loads at all audio frequencies.
The use of the Mclntosh designed trifilar autoformer makes the
Mclntosh solid state amplifiers the only amplifiers that deliver
FULL POWER AT ALL SPEAKER IMPEDANCES. You have not
been power penalized for your choice of loudspeakers when using
the Mclntosh MC2505.
Another of the advantages of the autoformers is the 25 volt output
for a constant voltage distribution system. With the MC2505 sev-
eral sets of speakers can be operated independently throughout
your home.
To further insure reliability a special power output SENTRY MONI-
TORING CIRCUIT prevents failure of the power output transistors
due to excessive mismatch of the output. When your MC2505
operates normally the SENTRY MONITORING CIRCUIT has no
effect on signals passing through the power amplifier. If the
power dissipation should rise above normal operation, the SEN-
TRY MONITORING CIRCUIT restricts the drive to the output
transistors. The SENTRY MONITORING CIRCUIT acts instantane-
ously for any input signal or load combination. This arrangement
assures complete circuit reliability. Only Mclntosh gives you this
degree of protection.
POWER SUPPLY SECTION
There are three separate power supply sections. One positive and
one negative high current supply is used for the output stages.
The other positive supply is used for the driving amplifier stages.
All supplies are full wave and use silicon rectifiers. Adequate filter-
ing is used to assure an absolute minimum of hum. The power out-
put stage filter capacitors have very high capacity, which allows
full power output below 20 Hz. The power transformer is generous
in size and runs cool, even under heavy use.
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