Audio Database

The

McIntosh MC2102 900,000yen(around the 2001 time)

Description
 
Stereo power amplifier announced as a new generation's thermionic-tube amplifier.

A total of the eight thermionic tubes of Twin-Triode 12AX7x2 of a high gain low distortion, high-voltage Twin-Triode 12AT7x2, and beam power tube KT88/6550x4 is used for MC2102 for every channel.
One of 12AX7 is used for a balance input, and one more is used for a voltage amplification and phase inversion. The signal is sent to the grid of one 12AT7 push-pull-voltage amplifier. To a bootstrap voltage amplification of 12AT7 push pull, the 2nd 12AT7 operates as four push pull grounded plate amplifiers of KT88/6550. The output tube serves as a parallel push pull interconnection.
Three sorts of choices of a stereo / mono-parallel / mono bridged are possible for the operational mode of amplifier.

The patent mac unity couple circuit is adopted.
It has two distinctive characteristicses in this circuitry, and one has usually taken output power from the plate and cathode of the output tube to having taken output power only from the plate.
Another is a unity couple (multiplex feedback amplification) circuitry of only a mac, prepares two primary coils of bifilar-wound き in an output transformer, and one piece is used for cathode and it is using one more piece for a plate.
This has attained the low-distortion value.

The output transformer of a multi-filer volume is employed.
Four output tubes have sent the signal to the output transformer through two primary coils for a plate and cathode, and these coils are the bifilar-wound lines coiled together simultaneously. Moreover, the secondary winding consists of five coils and is distributed between primary coils. Parallel connection of these five coils is carried out so that it may become a very low series resistor to a speaker load intensity.
It not only compensates the speaker dumping which was excellent by this way, but it can perform close coupling between a primary coil and a secondary winding, and the flat frequency characteristic and large power bandwidth are obtained.
The steel plate currently used for a transformer is accumulating the silicon steel plate for audios to which the crystal of the top quality was equal, and its full power output is possible for at least 17Hz.

A balance and unbalance can be chosen with an input slide switch.
Noise-rejection capacity of a balance operation improves and inphase component exclusion in inside compass has become 60dB or more.

The blue-eyes power meter of the tradition in which illumination OFF of meter is also possible is carried.
This meter can choose the WATS position which shows a transition of the sound volume of the special-NetWare-program source, and the hold position which will stop in that location and will return to a quiescing location slowly if the maximum power is directed.

A stack-like pipe is installed on the off site of a root of an output tube, and the cooling effect is heightened by heightening the convection effect of air.

Nature gilding of high of the contact is carried out, and the insulation resistance value is carrying out the gilding treatment also of the huge binding post which clears the socket of the ceramic material which was greatly excellent in the high-temperature-proof property, unbalance and a balance in connector, and the Oide power of 200A.
A spade connector, a banana plug, and the wire to AWG No. 8 can be used for this binding post.

The main chassis serves as a product made from stainless steel of specular surface finish.

Upper

Rating of a mode
Form Stereo power amplifier
Stereo output 100W+100W (2ohm, 4ohm, 8ohm, the sinusoidal succession minimum mean-value power output)
Output RMS voltage: 14.2V (2ohm), 20.0V (4ohm), 28.3V (8ohm)
Mono-parallel output 200W (1ohm, 2ohm, 4ohm, the sinusoidal succession minimum mean-value power output)
Output RMS voltage: 14.2V (1ohm), 20.0V (2ohm), 28.3V (4ohm)
Mono-bridge output 200W (4ohm, 8ohm, 16ohm, the sinusoidal succession minimum mean-value power output)
Output RMS voltage: 28.3V (4ohm), 40.0V (8ohm), 56.6V (16ohm)
THD 0.5% or less (being all the level in 250mW - an Output power)
Intermodulation distortion (SMPTE) 0.5% or less (when peaking capacity does not exceed the twice of a rated power output at the moment)
Output-power frequency 20Hz - 20kHz
Frequency characteristic 20Hz-20kHz+0 -0.25 dB
10Hz-100kHz+0 -3.0 dB
SN ratio (A load) 100dB (below an Output power)
Wide band dumping factor 18 or more
Output load impedance Stereo: 2 ohms, 4ohm, 8ohm
Mono-parallel: 1 ohm, 2ohm, 4ohm
Mono-bridge: 4 ohms, 8ohm, 16ohm
Input impedance Unbalance: 20kohm
Balance: 40kohm
Input sensitivity 1.0V
Valves employed 12AX7x4 (an input and phase inversion)
12AT7x4 (a voltage amplification and driver)
KT88 or 6550x8 (output tube)
Power source AC100V, 50Hz/60 Hz, 5.8A
Dimensions Width 455.4x height 257.2x depth of 406.4mm
Weight 40kg