Considered one of the best mono block amplifiers of all time this pair has been partnered up for decades and has been serviced by nop notch tube amplifier tech Brent Bagby of Solderhaus here in the pacific northwest. This listing includes the original Capacitors that to the unit. To quote well sourced technical specifications and reviews of these amps: The McIntosh Model MC-30 is a 30 watt high fidelity power amplifier designed for home entertainment systems and professional applications. The Model MC-30 is similar to the earlier McIntosh Model A-116 30 watt amplifiers and includes all of the rigid electrical specifications and features found in these earlier units plus: less than 1/3% harmonic distortion at any power output up to 30 watts and at any frequency in the audio spectrum, 20 to 20,000 cps; less than 1/2% intermodulation distortion if instantaneous peak power is below 60 watts for any combination of frequencies 20 to 20, 000 cps; and noise and hum level 90 db or more below rated output. The famous McIntosh high efficiency output circuit is used to obtain the high standard of performance found in this amplifier. The MC-30 maybe operated from any signal source delivering 0. 5 or more volts, or directly from a McIntosh Audio Compensator or Pre-Amplifier, such as the Models C-8, C-4, C-104, or C-108. Output impedances of 4, 8 and 16 ohms are provided for direct connection to loudspeakers. Additional outputs for 166 ohms (70.7 volts) and 600 ohms are provided for use with multiple speaker systems, lines, etc. INS