McIntosh C100

Commentary

Control amplifier with dual chassis structure.

The upper chassis is equipped with a low-noise power supply system and a remote controller for operation, and the lower chassis is equipped with a signal system to prevent interference and sound quality degradation.

It is equipped with a phono equalizer and a newly developed transformer with a silver wire coil for the MC cartridge, which is housed in a mu-metal shield case.

A fully balanced circuit is used from input to output, and unbalanced input is converted into a balanced signal for transmission. In addition, a dedicated regulator is installed for each stage of amplification to respond to the expanding dynamic range of the source.
In addition, by carefully examining parts such as low-noise metal-coated resistors and polypropylene capacitors, we aim to achieve higher sound quality.

A digital control attenuator using a microprocessor was developed and installed in the volume to achieve a high accuracy of ± 0.05 dB or less.
The user interface is performed by an optical rotary encoder with 128 steps per rotation.

Volume and balance adjustments are indicated by a Macintosh blue fluorescent tube. Gain values can be displayed in 0.5 dB steps from the maximum of 15 dB to the minimum of -80dB, or as a percentage of the full volume.
When the balance knob is moved, the value is displayed in dB, and the volume display returns after about 5 seconds.

Equipped with a source trim function that adjusts the level of each input even when the source is switched.

A microprocessor and relay are used for input switching and other controls. In addition, volume adjustment and other processing are performed by the microprocessor.
The relay contacts are ruthenium evaporated and sealed with a glass tube filled with an inert gas that does not contain oxygen to improve reliability.

Equipped with a Rec out selector.

Equipped with double-shielded power transformer.

It is equipped with a processor input / output terminal to which a graphic equalizer can be connected.

Equipped with a power switch that can be reset if the microprocessor is locked due to lightning or other causes.

Wireless remote control is included.

Model Rating

Type	Stereo preamplifier
Frequency characteristic	10 Hz ~ 40 kHz + 0 -0.5 dB
Rated output	2.5 V (balanced / unbalanced, main, switched 1/2 respectively)
Output impedance	100 Ω (Balanced) 50 Ω (unbalanced)
Maximum output voltage	25.0 V (balanced main / switched output, 10 Hz to 40 kHz) 12.0 v (main / switched unbalanced output, 10 Hz to 40 kHz)
Total harmonic distortion factor	Maximum 0.002% (20 Hz to 20 kHz at rated output)
Input sensitivity	Phono : 4.4 mV (0.5 mV IHF at 2.5 V rated output) High Level : 450 mv (50 mv IHF at 2.5 v rated output)
S/N ratio (A-network)	Phono:86dB High Level:98dB
Maximum input signal	Phono MM:50mV High Level : 5 v (balanced)
Input impedance	Phono MM : 47k Ω Phono MC : 5 Ω High Level (balanced) : 44k Ω High Level (unbalanced) : 22k Ω
Voltage gain	70 dB (MC → Tape out) 40 dB (MM → Tape out) 0 dB (High Level → Tape out) 15 dB (High Level → Main out)
AC outlet	Switched : four systems Unswitched : 1 system
Pwer	AC100V
Power consumption	25W
External dimensions	444 mm wide x 137 mm high x 445 mm deep per chassis
Weight	11.0 kg (Control Part) 8.7 kg (Preamplifier Part)
Attachment	Wireless Remote Control