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MC 250 SERVICE INFORMATION S T A R T I N G WITH S E R I A L N O . 23L48 MCINTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK MC 250 ELECTRICAL SPECIFICATIONS Power Output: 100 watts RMS continuous, 50 watts per channel operating simultaneously, into 4 ohm, 8 ohm, or 16 ohm loads. Harmonic Distortion: Less than 0.25% at rated power output from 20Hz to 20,000Hz. Intermodulation Distortion: Less than 0.25% for any combination of frequencies between 20 Hz and 20,000 Hz. Frequency Range: At rated output both channels: +0 to -0.25dB from 20Hz through 20,000Hz. Output Damping Factor: Greater than 10 for any output tap. Input Sensitivity & Impedance: Input sensitivity is 0.5 volts. Input impedance Is 200K ohms. Hum & Noise : Greater than 90dB below rated output. Power Requirements: 117 volts AC,50-60Hz, 50 watts at zero signal output, 250 watts at rated output. MC 250 MC 250 LEFT CHANNEL POWER OUTPUT PRINTED CIRCUIT BOARD 043-916 RIGHT CHANNEL POWER OUTPUT PRINTED CIRCUIT BOARD 043-916 INPUT SECTION PRINTED CIRCUIT BOARD 043-795 MC 250 MC 250 MC 250 SCHEMATIC NOTES 1. Unless otherwise s p e c i f i e d : R e s i s t a n c e v a l u e s are i n ohms, 1 / 2 w a t t , and 10% t o l e r a n c e ; c a p a c i t a n c e v a l u e s s m a l l e r than 1 are i n m i c r o f a r a d s (