McIntosh MC 1000

All pre-owned product is tested in our service department and have been passed for sale... and comes with a 90 day warranty! Our techs have replaced all the bulbs and one meter switch, then tested to spec.

These are in nice condition - One has a chrome base and one has flat black base, one has sun faded panels on the sides of the meter that tested fine.

Original box and packing are NOT included, so these are LOCAL SALE ONLY.

NOTE: THESE ARE OVER 100LBS EACH! PLEASE BRING HELP AND THE APPROPIATE VEHICLE FOR TRANSPORT.

Pix with white backgrounds are stock. Our carpet is the refections you see on the front glass pix. See last image for specs.

Note: it take 30 mins to warm up sonically We are an authorized Mac Dealer. One of their most powerful amp model ever! Circa 1992-2000.

All the very cool technical details:

From Mac: McIntosh Laboratory, the company who introduced in 1949 the world's first amplifier that could be called "High Fidelity", has created a new power amplifier without compromise. It is the Model MC1000. All the most advanced circuit design concepts are utilized in this amplifier. A continuous average power output rating of 1000 watts, and a maximum Peak Current Output of 160 amperes makes this not only the most advanced, but also the most powerful amplifier McIntosh has ever manufactured. The MC1000 has the reserve power capability to deliver more than 4000 watts output, in 20ms tone bursts, into a 1.6 ohm load connected to the amplifier's 8 ohm output. The MC1000 can deliver the best possible performance from any type of loudspeaker system. The distortion limits for the MC1000 are no more than 0.005% at rated power output for all frequencies from 20Hz to 20,000Hz. Typical performance at mid frequencies is less than 0.002%. The true distortion readings on the MC1000 are so low, it takes special measuring techniques to make accurate readings.

DESIGN PHILOSOPHY: The design philosophy incorporated in the MC1000 involved many different techniques, all based on sound scientific logic. Every stage of voltage or current amplification is design-ed to be as linear as possible. Negative feedback is then utilized to enhance the performance. McIntosh engineers know how to properly design negative feedback circuits so they con-tribute to the extremely low distortion performance expected from a McIntosh amplifier. The typical McIntosh owner would never accept the approximately 100 times higher distortion of many so called non feedback designs. Double Balanced Push Pull design is used from input to output. Each half of the amplifier contains complementary balanced circuitry. The resulting double balanced configuration cancels even order distortion. All transistors are selected to have nearly constant current gain (Beta) over the entire cur-rent range they must cover. Output transistors in particular, have matched uniform current gain, high current-bandwidth product and large active region safe operating area. Resistors and capacitors in the signal path are carefully selected to have exceedingly low voltage coefficients, (change of resistance or reactance with applied voltage). Precision metal film resistors, low dielectric absorption film capacitors and premium audio grade electrolytics are used in all critical circuit locations.

PROTECTION CIRCUITS: Some power amplifier manufacturers claim that their products do not need or do not use protection circuits and that such circuits compromise performance. McIntosh feels that pro-tection circuits are desirable and necessary to prevent amplifier or loudspeaker damage due to abnormal circumstances. The genius of McIntosh engineering has resulted in protection circuits which do not effect or compromise the normal performance of a power amplifier. Six different types of protection circuits are incorporated in the MC1000 to insure it a long, safe and trouble-free operating life. This is just one of the characteristics of McIntosh power amplifiers that has made them world famous. The SENTRY MONITOR circuit is a good example.

SENTRY MONITOR CIRCUIT: All power transistors have limits for the maximum amount of power they can handle. The MC1000 output transistors and power supply have been designed to allow very high current flow into properly matched load impedances. However, if a short circuit or very low load im-pedance is connected to the MC1000 outputs, destructive current levels could be reached if it was not controlled by the McIntosh SENTRY MONITOR circuit. This circuit senses the dynamic operating time, voltage and current of the output stage, and controls it to safe operating limits. The SENTRY MONITOR circuit does not limit the power output available from the amplifier. There is absolutely no compromise in sonic performance and it ensures safe operation of the amplifier under even the most extreme operating conditions.

THERMAL CONTROL: l power transistors have limits for the maximum amount of heat they can safely tolerate. The MC1000 uses a highly efficient amplifying circuit which produces relatively little heat from the power transistors for the output power produced. The amplifier uses large area heat sinks with an area of more than 2800 square inches to efficiently dissipate the transistor heat. Natural convection air flow is sufficient for safe cool operation. Cooling fans are not required. If the cooling air is blocked, or the amplifier operating temperature is forced too high, thermal cutout switches will turn off the AC power to the amplifier. When the problem is corrected and the amplifier cools to its normal operating temperature, the AC power will turn back on.

POWER GUARD:m The MC1000 includes the unique and patented McIntosh POWER GUARD circuit. POWER GUARD eliminates the possibility of ever overdriving the amplifier into clipping. Clipping occurs when an amplifier is overdriven past its output design capabilities. An over-driven amplifier can produce both audible and ultrasonic distortion levels approaching 40%. The audible distortion is certainly unpleasant, but the ultrasonic distortion is also undesirable, since it can damage tweeter loudspeakers. The POWER GUARD circuit acts as a waveform comparator, monitoring both the input and output signal waveforms. Under normal operating conditions there are no differences bet-ween these waveforms. When an amplifier is overdriven beyond its maximum distortion free output, there will be a difference between the two signal waveforms. If the difference exceeds 0.3% (equivalent to 0.3% harmonic distortion), the amber POWER GUARD indicator will light. If the difference continues to increase, the POWER GUARD circuit controls an electronic at-tenuator at the input to reduce the gain of the amplifier just enough to prevent any further increase in distortion. Distortion will not exceed 2% with as much as 14dB overdrive. Without POWER GUARD, the distortion could easily reach 40% for the same operating conditions. A McIntosh power amplifier with POWER GUARD will always deliver its maximum distor-tion free output. This power is always well above the rated power due to the McIntosh philosophy of conservative design. You will never experience the harsh and damaging distor-tion due to clipping when using a McIntosh MC1000 Amplifier with POWER GUARD.

THE VERSATILE MclNTOSH OUTPUT AUTOFORMER: All transistor power output circuits work best into what is called an optimum load. Depend-ing on the number and configuration of transistors used, this optimum load may vary con-siderably from what a loudspeaker requires. In the case of more than one loudspeaker con-nected in parallel, the impedance load reflected to the power amplifier may drop to two ohms or even less. A power amplifier connected to a load that is lower than optimum causes extra current to flow and extra heating of the power transistors. This means the amplifier will run much hotter, with a corresponding reduction in operating life. The output signals from the two balanced circuits in the MC1000 are coupled into the autoformer at the point on the windings that is an optimum impedance match for the tran-sistors in the circuit. The autoformer includes balanced output impedance taps for exact loudspeaker matches of 2 ohms, 4 ohms and 8 ohms. The MC1000 amplifier will always be operating at its most efficient point, and speaker performance always will be at its best. Any McIntosh power amplifier with an autoformer is especially well suited for stereo installations that require multiple speakers, since it is possible to have a very close impedance match.

The frequency response of a McIntosh autoformer exceeds that of the output circuit itself, and extends well beyond the audio range. Its distortion level is so low it is virtually impossible to measure. The McIntosh Autoformer is, quite simply, a significant engineering advance in power amplifier performance and reliability. The unequaled expertise of McIntosh in the design and manufacturing of autoformers is legendary in the high fidelity industry. In the rare event of output circuit failure, the McIntosh autoformer will conduct any speaker damaging DC {direct current), directly to circuit ground. This will protect your valuable loudspeakers from possible damage.

TRUE POWER OUTPUT WATT METER: An illuminated 8 inch WATT meter is provided on the MC1000 front panel. The meter is peak responding and its circuits are constantly reading both voltage and current delivered to the speaker load. A speaker may have a change in impedance at different frequencies resulting in a change of output current requirements. The MC1000 meter reacts to these changing conditions and indicates the true amplifier power output at all times. In the METER WATTS position, the meter responds to the musical information and reads the amplifier output on a continuous basis. In the METER HOLD position the meter will lock to the highest power peak in a sequence of peaks. If no higher power peaks are reached, the meter pointer will slowly return to the lower power level. If the music stops, the meter pointer will return to the rest position. The meter pointer decay rate is approximately 6dB per minute. The MC1000 output meter is extremely accurate, and will respond to 95% of full scale, with only a single cycle of a 2,000Hz tone burst.

ADDITIONAL FEATURES: Heavy duty high current gold plated output terminals will accept speaker cables up to 0.204 inches {5.18mm) in diameter. It is easy to connect speakers using any of the currently popular speaker cables. Both Balanced as well as an Unbalanced input jacks are provided for complete flexibility in any installation.