McIntosh Amplifiers Part 2
A History

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MC 2150 Stereo Power Amplifier

ELECTRICAL: 150w/ch. (300w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -95dB. Output impedance 1, 2, 4, and 8 ohms. (0.5, 1, 2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 50k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Anodized gold and black panel. Gain controls. Power Guard lamps: normal or limit. Power sw: on or off. Speaker sw: on or off. System test digital readout. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo, mono bridge or mono parallel. Fuse.

Size 5-7/32"H, 16"W and 14-1/2"D. Weight 58 lb.Sold from 1982-1987. Last retail price $1925.00

MC 2155 Stereo Power Amplifier

ELECTRICAL: 150w/ch. (300w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -95dB. Output impedance 1, 2, 4 and 8. (0.5, 1, 2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 50k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel with black & gold escutcheon. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter range sw: -20, -10, 0, watts and hold. Power Guard lamps: normal or limit. Speaker sw: on or off. Power sw: on or off. System test digital readout. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo, mono bridge or mono parallel. Fuse. Panloc mounting.

Size 5-7/16"H, 16"W and 14-1/2"D. Weight 65 lb. Sold from 1981-1986. Last retail price $2295.00

MC 2200 Stereo Power Amplifier

ELECTRICAL: 200w/ch. (400w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.1%. Noise and hum -95dB. Output impedance 1, 2, 4, and 8 ohms. (0.5, 1, 2, and 4 ohms in mono). Damping factor 16 or greater. Input impedance 100k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Anodized gold and black panel. Gain controls. Output mode lamps: normal or limit. Power sw: on or off. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo or mono. Power Guard sw: normal or out. Fuse.

Size 6-31/32"H, 16"W and 14-1/2"D. Weight 73 lb. Sold from 1976-1982. Last retail price $1199.00

MC 2205 Stereo Power Amplifier

ELECTRICAL: 200w/ch. (400w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.1%. Noise and hum -95dB. Output impedance 1, 2, 4 and 8 ohms. (0.5, 1, 2, and 4 ohms in mono). Damping factor 16 or greater. Input impedance 100k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel with black & gold escutcheon. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter range sw: -20, -10, 0, watts and hold. Output mode lamps: normal or limit. Meter function lamps: watts, hold or decibels. Speaker sw: on or off. Power sw: on or off. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo or mono. Fuse. Panloc mounting.

Size 7-1/8"H, 16-3/16"W and 14-1/2"D. Weight 85 lb. Sold from 1975-1979. Last retail price $1649.00

MC 2250 Stereo Power Amplifier

ELECTRICAL: 250w/ch. (500w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -95dB. Output impedance 1, 2, 4, and 8 ohms. (0.5, 1, 2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 50k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Anodized gold and black panel. Gain controls. Power Guard lamps: normal or limit. Power sw: on or off. Speaker sw: on or off. System test digital readout. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo, mono bridge or mono parallel. Fuse.

Size 6-31/32"H, 16"W and 14-1/2"D. Weight 80 lb. Sold from 1982-1987. Last retail price $2495.00

MC 2255 Stereo Power Amplifier

ELECTRICAL: 250w/ch. (500w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -95dB. Output impedance 1, 2, 4 and 8. (0.5, 1, 2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 50k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel with black & gold escutcheon. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter range sw: -20, -10, 0, watts and hold. Power Guard lamps: normal or limit. Speaker sw: on or off. Power sw: on or off. System test digital readout. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo, mono bridge or mono parallel. Fuse. Panloc mounting.

Size 7-1/8"H, 16-3/16"W and 14-1/2"D. Weight 82 lb. Sold from 1981-1986. Last retail price $2995.00

MC 2300 Stereo Power Amplifier

ELECTRICAL: 300w/ch. (600w mono). Response 20-20kHz (+0 -0.5dB). Distortion 0.25%. Noise and hum -90dB. Output impedance 0.5, 1, 2, 4, 8 and 16 ohms. (0.25, 0.5, 1, 2, 4 and 8 ohms in mono). Damping factor 14 or greater. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor.

FRONT PANEL: Anodized gold and black panel. Power level (meters read +3 at 300w). Gain controls. Meter range sw: -20, -10, 0, and off. Power sw: on or off. Handles.

BACK PANEL: Output barrier strips. Audio inputs. Mode sw: stereo or mono. Circuit breaker. Dual cooling fans.

Size 19" rack mounting. 10-1/2"H and 17"D. Weight 128 lb Sold from 1971-1980. Last retail price $1799.00

MC 2500 Stereo Power Amplifier

ELECTRICAL: 500w/ch. (1000w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -95dB. Output impedance 1, 2, 4, and 8 ohms. (0.5, 1, 2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 50k. Input sensitivity 0.75v or 2.5v. Sentry Monitor. Power Guard.

FRONT PANEL: Black panel. Illuminated power level meters (linear watts or dB). Gain controls, Meter range sw: -20, -10, 0, watts and hold. Power sw: on or off. Speaker sw: on or off. Power Guard lamps: normal or limit. Handles.

BACK PANEL: Output barrier strips. Audio inputs. Mode sw: stereo, mono bridge or mono parallel. Fan sw: thermally switched lo, hi or continuous hi. Dual cooling fans.

Size 19" rack mounting. 10-1/2"H and 17"D. Weight 129 lb Sold from 1980-1990. Last retail price $3800.00

MC 2505 Stereo Power Amplifier

ELECTRICAL: 50w/ch. Response 20-20kHz (+0 -0.25dB). Distortion 0.25%. Noise and hum -90dB. Output impedance 4, 8 and 16 ohms. Damping factor 10. Input impedance 200k. Input sensitivity 0.5v. Headphone impedance 4 to 600 ohms. Sentry Monitor.

FRONT PANEL: Glass panel. Illuminated. Power level meters (meters read 0 at 50w). Gain controls. Meter range sw: off, -20, -10 and 0. Speaker sw: on or off. Power sw: on or off. Headphone jack.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Circuit breaker. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D. Weight 38 lb. Sold from 1967-1977. Last retail price $549.00

MC 2600 Stereo Power Amplifier

ELECTRICAL: 600w/ch. (1200w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -105dBA. Output impedance 2, 4, and 8 ohms stereo. (1, 2, 4, 8 and 16 ohms in mono). Damping factor 40 or greater. Input impedance 20k unbalanced, 40k unbalanced. Input sensitivity 1.4v or 2.5v. Sentry Monitor. Power Guard.

FRONT PANEL: Black panel. Illuminated power level meters (linear watts or dB). Gain controls, Meter sw: watts or hold. Power sw: on or off. Speaker sw: on or off. Power Guard lamps. Headphone jack. Handles.

BACK PANEL: Output barrier strips. Audio inputs: unbalanced and balanced. Mode sw: stereo, mono bridge or mono parallel. Dual cooling fans thermally switched.

Size 19" rack mounting. 10-1/2"H and 18"D. Weight 130 lb Sold from 1990-1995. Last retail price $6000.00

MC 3500 Tube. Mono.

ELECTRICAL: 350w. Response 20-20kHz (+0 -0.5dB). Distortion 0.15%. Noise & hum -95dB. Output impedance 1, 4, 8, 16, 50 and 64 ohms. All impedances can be isolated from ground. Internal impedance less than 5% of rated impedance. Input impedance 200k. Input sensitivity 1.1V.

FRONT PANEL: Anodized gold and black panel. Input connectors: RCA and BNC (front and rear). Gain control. Meter Range switch: off, volts, dB, dB-10 or V1-V8. Power circuit breaker: on or off. Output range switch: 1 , 4, 8, 16, 50, and 64 ohms with corresponding voltages 17.3, 35.8, 53.0, 75.0, 132 and 150V. Dual banana output connectors. Meter: monitors output voltage, dB or cathode current for each output tube. Heavy duty handles.

BACK PANEL: Line voltage sw: 117 or 125V. Output barrier strip. Input terminals. Sub sonic filter switch: in or out. Cooling fan.

TUBES: 8-6LQ6/6JE6B output, 2-12AX7/ECC83, 2-6DJ8/ECC88, 6CG7/6FQ7 and 6BL7GTA. Solid state rectifier bridge.

Size 19" rack mounting. 10-1/2"H, and 17"D behind panel. Weight 125 lb. Sold from 1968-1971. Last retail price $1099.00

MC 7100 Stereo Power Amplifier

ELECTRICAL: 100w/ch into 8 ohms or 150w into 4 ohms. (300w into 8 ohms mono) Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -115dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 100 or greater. Input impedance 20k. Input sensitivity 1.4v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power Guard lamps.

BACK PANEL: Output barrier strip. Audio inputs. Gain controls. Mode sw: stereo or mono. AC outlet. Fuse. Panloc mounting.

Size 3-5/8"H, 17-1/2"W and 14-1/2"D. Weight 24 lb. Sold in 1992-1997. Last retail price $1400.00

MC 7104 Four-Channel Power Amplifier

ELECTRICAL: Four channels. 100w/ch into 4 ohms. (200w into 8 ohms mono with 2 channels bridged) Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -108dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 100 or greater. Input impedance 20k. Input sensitivity 1v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power Guard lights. Four led power level columns in X10 increments from .01w to 100w. Power led's indicate when each channel pair is active.

BACK PANEL: Output terminals. Audio inputs: unbalanced and balanced. Power control jacks: in and out. Power sw: on or off/remote. Level controls: normal and mono bridged. Mode sw: normal or mono bridged. Multi-room connector: in and out. Fuse.

Size 7-1/16"H, 17-1/2"W and 20"D. Weight 48 lb. Sold from 1995-1997 Last retail price $2750.00

MC 7106 Six-Channel Power Amplifier

ELECTRICAL: Six channels. 100w/ch into 8 ohms or 150w into 4 ohms. (300w into 8 ohms mono with 2 channels bridged) Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -113dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 100 or greater. Input impedance 20k. Input sensitivity 1v. Sentry Monitor. Power Guard. THX approved.

FRONT PANEL: Glass panel. Illuminated. Power Guard lights. Six led power level columns in X10 increments from .01w to 100w.

BACK PANEL: Output terminals. Audio inputs. Display brightness control: max to off. Power control jacks: in and out. Power sw: on or off/remote. THX 25 pin input connector. Level controls: normal and bridged. Mode sw: normal or bridged. Fuse.

Size 7-1/8"H, 17-1/2"W and 20"D. Weight 52 lb. Sold from 1992-. Last retail price $3500.00

MC 7108 Eight-Channel Power Amplifier

ELECTRICAL: Eight channels. 40w/ch into 4 ohms. (100w into 4 ohms mono with 2 channels bridged) Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -112dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 100 or greater. Input impedance 20k. Input sensitivity 1v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power Guard lights. Power led's indicate when each channel pair is active.

BACK PANEL: Output terminals. Audio inputs and outputs. Power control jacks: in and out. Power sw: on or off/remote. THX 25 pin input connector. Level controls: bridged and stereo/mono. Mode sw: bridged, stereo or mono. Multi-room connector. Fuse.

Size 7-1/16"H, 17-1/2"W and 20"D. Weight 40 lb. Sold from 1994- Last retail price $2500.00

MC 7150 & MC7150(W) Stereo Power Amplifier

ELECTRICAL: 150w/ch into 8 ohms. Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -110dBA. Output impedance 2, 4 or 8 ohms. Damping factor 40 or greater. Input impedance 20k. Input sensitivity 1.4v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter sw: watts or hold. Power Guard lamps. Power sw: on or off.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Fuse. Panloc mounting.

Size 5-5/16"H, [Front panel width was 16-3/16" in early units and 17-1/2" in later units]. 15-1/4"D. Weight 58 lb. Sold from 1991-1994. Last retail price $2400.00

MC 7200 & MC7200(W) Stereo Power Amplifier

ELECTRICAL: 200w/ch into 8 ohms. 300w into 4 ohms. (600w into 8 ohms mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -105dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 200 or greater. Input impedance 20k unbalanced, 40k balanced. Input sensitivity 1.4v or 2.5v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel top. Black anodized bottom. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter hold sw. Power Guard lamps. Power sw.

BACK PANEL: Output barrier strip. Audio inputs: unbalanced and balanced. AC outlet. Input sensitivity sw: 1.4v or 2.5v. Mode sw: stereo or mono. Fuse. Panloc mounting.

Size 7-1/8"H, [Front panel width was 16-3/16" in early units and 17-1/2" in later units]. 15-5/8"D. Weight 53 lb. Sold from 1989-1993. Last retail price $2779.00

MC 7270 Stereo Power Amplifier

ELECTRICAL: 270w/ch. (540w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.02%. Noise and hum -100dB. Output impedance 1, 2, 4 and 8 ohms. (2, 4, 8 and 16 ohms in mono). Damping factor 30 or greater. Input impedance 20k. Input sensitivity 0.75v or 2.5v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel top. Black anodized bottom. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter sw: watts or hold. Power Guard lamps. Power sw: on or off.

BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo or mono bridge. Fuse. Panloc mounting.

Size 7-1/8"H, 16-3/16"W and 14-1/2"D. Weight 82 lb. Sold from 1985-1991. Last retail price $2499.00

MC 7300 & MC7300(W) Stereo Power Amplifier

ELECTRICAL: 300w/ch. (600w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -105dBA. Output impedance 2, 4 and 8 ohms. (1, 2, 4, 8 and 16 ohms in mono). Damping factor 40 or greater. Input impedance 20k unbalanced, 40k balanced. Input sensitivity 1.4v or 2.5v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power level meters (linear watts or dB). Gain controls. Meter sw: watts or hold. Power Guard lamps. Power sw: on or off.

BACK PANEL: Output barrier strips. Audio inputs: unbalanced and balanced. AC outlet. Input level sw: 1.4v or 2.5v. Mode sw: stereo, mono bridge or mono parallel. Fuse. Panloc mounting.

Size 7-1/8"H, [Front panel width was 16-3/16" in early units and 17-1/2" in later units]. 15-9/16"D. Weight 79 lb. Sold from 1991-1995. Last retail price $3400.00

MK-30 Tube. Mono

Identical to MC-30 amplifier but sold in kit form. Sold from 1960-1961. Last retail price $120.00

 

Industrial-use Amplifiers

McIntosh made over 40 special or modified amplifiers for industry. The first few listed have detailed descriptions. The remainders are only mentioned. Any additions are welcome.

K-107 Tube. Mono.

ELECTRICAL: 200w. Response 20-20kHz (+0.2 -0.2dB). Distortion 1.0%. Noise & hum -80dB. Output impedance [k-107F 150 and 600 ohms; K-107G 16.5, 25, 66 and 100 ohms; K-107H 4, 8, 16 and 600 ohms], Damping factor 12. Input impedance 500k. Input sensitivity 0.5v.

MECHANICAL: Separate amplifier and power supply chassis. Output tubes 8005.

KS-16575-L1 (A-125) (revised MI-10) Tube. Mono. Made for Western Electric Co.

ELECTRICAL: 10w. Response 20-20kHz (+0.5 -0.5dB). Distortion 0.5%. Noise & hum -55dBm. Output impedance 2, 8, 16, 600 ohms matched and 600 ohms unmatched. 70.7V may be obtained from the 600 ohm unmatched output. Damping factor 10. Input impedance: 150 or 600 ohms balanced or unbalanced. 10k ohms bridging. Gain 63dB for 150 0r 600 ohm inputs. Uses McIntosh transformers M-174, 195 and 196. 6L6's are wired to function as tetrodes.

MECHANICAL: Bell system gray panel, hammertone gray chassis. Output terminals for all output impedances located beneath front panel. Input attenuators: 10 steps in 5dB/step and 0.5dB/step.

TUBES: 2-6L6 output, 12AX7, 12AU7, 12BH7, 5U4 rectifier.

Size 19" rack mounting. 7"H, and 8-1/2"D. Weight 35 lb. Sold about 1957. Last price ?

KS-16622-L1 (A-128) (MI-30) Tube. Mono. Made for Western Electric Co.

ELECTRICAL: 30w. Response 20-20kHz (+0.5 -0.5dB). Distortion 0.5%. Noise & hum -45dBm. Output impedance 1, 4, 8, 16, 150 and 600 ohms. 70.7V may be obtained from the 150 ohm output. Damping factor 10. Input impedance: 150 or 600 ohms balanced or unbalanced. 10k ohms bridging. Gain 66dB for 150 0r 600 ohm inputs.

MECHANICAL: Bell system gray finish. Output terminals for all output impedances located beneath front panel. Input attenuators: 10 steps in 5dB/step and 0.5dB/step.

TUBES: 2-6L6GC or 7027-A output, 2-12AX7, 12AU7, 12BH7, 5U4 rectifier.

Size 19" rack mounting. 7"H. Weight 40 lb. Sold about 1960. Last price ?

KS-19602 L1 Tube. Mono. Made for Western Electric Co.

ELECTRICAL: 25w. Response 20-20kHz (+0.5 -1.0dB). Distortion 0.5%. Noise & hum -44dBm. Output impedance 1, 4, 8, 16, 150, 200 and 600 ohms. 70.7V may be obtained from the 200 ohm output. Damping factor 10. Input impedance: 150 or 600 ohms balanced or unbalanced. 10k ohms bridging. Gain 66dB for 150 0r 600 ohm inputs.

MECHANICAL: Octal output socket for all output impedances. Input attenuators: 10 steps in 5dB/step and 0.5dB/step. Light gray.

TUBES: 2-7591 output, 6AV6, 12AU7, 12BH7. Solid state rectifier.

Size 19" rack mounting. 5-1/4"H, and 10"D. Weight 33 lb. Sold about 1963-1967. Last price ?

MC50E Mono.

ELECTRICAL: 50w. Response 40-20kHz (+0 -0.1dB). Distortion 0.25%. Noise and hum -90dB. Isolated output impedance 4, 8, 16, 100 and 275 ohms. Damping factor 9. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor. Full transformer.

MECHANICAL: Chrome chassis. Output barrier strip. Audio input. Gain control. AC outlet. Fuse.

Size 5-1/2"H, 8"W and 12-1/2"D. Weight 20 lb. Sold approximately 1970. Last retail price $224.00

MC100E Mono.

ELECTRICAL: 100w. Response 40-20kHz (+0 -0.1dB). Distortion 0.25%. Noise and hum -90dB. Output impedance 4, 8, 16,50 and 137 ohms. Damping factor 10. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor. Full transformer.

MECHANICAL: Chrome chassis. Output barrier strip. Audio input. Gain control. AC outlet. Fuse.

Size 6-1/2"H, 9-1/4"W and 14-3/4"D. Weight 32 lb. Sold approximately 1971. Last retail price $324

MC250E

ELECTRICAL: 50w/ch stereo. 100w mono. Response 40-20kHz (+0 -0.5dB). Distortion 0.25%. Noise and hum -90dB. Isolated output impedance 4, 8, 16, 100 and 275 ohms (2, 4, 8, 16, 32, 50, 137, 200 and 550 ohms mono). Damping factor 13. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor. Full transformer.

MECHANICAL: Chrome chassis. Output barrier strips. Audio inputs. Gain controls. Mono-stereo switch. AC outlet. Circuit breaker. Output socket.

Size 7-1/16"H, 10-5/8"W and 15-5/8"D. Weight 35 lb. Sold approximately 1972. Last retail price $404.00

MC2100E

ELECTRICAL: 100w/ch stereo. 200w mono. Response 20-20kHz (+0 -0.5dB). Distortion 0.25%. Noise and hum -90dB. Isolated output impedance 4, 8, 16, 50 and 144 ohms (2, 4, 8, 16, 25, 32, 72, 100 and 288 ohms mono). Damping factor 10. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor. Full transformer.

MECHANICAL: Chrome chassis. Output barrier strips. Audio inputs. Gain controls. Mono-stereo switch. AC outlet. Fuse. Output socket.

Size 7-3/4"H, 11-3/4"W and 17"D. Weight 67 lb. Sold approximately 1972. Last retail price $524.00

MC2300E

ELECTRICAL: 300w/ch. (600w mono). Response 40-20kHz (+0 -0.5dB). Distortion 0.25%. Noise and hum -90dB. Output impedance 2, 4, 8, 16, 48 and 64 ohms. (1, 2, 4, 8, 24 and 32 ohms in mono). Damping factor 13 or greater. Input impedance 200k. Input sensitivity 0.5v. Sentry Monitor. Full transformer.

FRONT PANEL: Anodized gold and black panel. Power level (meters read +3 at 300w). Gain controls. Meter range sw: -20, -10, 0, and off. Power sw: on or off. Handles.

BACK PANEL: Output barrier strips. Audio inputs. Mode sw: stereo or mono. Circuit breaker. Dual cooling fans.

Size 19" rack mounting. 10-1/2"H and 17"D. Weight 135 lb Sold approximately 1971. Last retail price $1324.00

MI-60 (Type A-127) Tube. Mono.

ELECTRICAL: 60w. Response 20-20kHz (+0.1 -0.1dB). Distortion 0.5%. Noise & hum -90dB. Output impedance 4, 8, 16, and 600 ohms. 600 ohm balanced to ground. 4, 8 and 16 ohms isolated from ground. 70.7V output. Damping factor 15. Input impedance 250k. Input sensitivity 0.5V.

INPUT TRANSFORMERS: M-107 or M107A: 50, 250 or 600 ohm (-14dBm), M-108: 20k bridging (12dBm), M-180: 250 or 600 ohms (-24dBm).

MECHANICAL: Rack Mounting. Grey hammertone chassis. Octal socket powers McIntosh C-8, C-4, C104, or C-108 preamps. Octal socket for plug-in input transformers. Output octal socket and barrier strip for all impedances. Line voltage tap for 117 or 125V. On-off switch, Audio input. Gain control. Pilot lamp. Fuse.

TUBES: 2-6550 output, 2-12AX7, 12AU7, 12BH7, 2-5U4.

Chassis size 8-3/4", 9" behind panel, 1-1/4" in front of panel, 19"W. Weight 46-1/2 lb.

MI-75 Tube. Mono.

ELECTRICAL: 75w. Response: 18-40kHz (+0 -1.0dB). Distortion 0.5%. Noise & hum -90dB. Output impedance: 4, 8, 16, 67, 150 and 600 ohms. All outputs isolated from ground. Output voltages 25, 70.7, 115 and 230V. Internal impedance 8% of rated impedance. Input impedance 250k. Input sensitivity 0.5V.

MECHANICAL: Grey hammertone chassis. All output impedance and voltage connections at octal socket or barrier strip. Line voltage switch: 117 or 125V. Audio input.

FRONT PANEL: Gain control. Power switch: on or off. Fuse. Pilot light-red.

TUBES: 2-KT88/6550 output, 12AX7, 12AU7, 12BH7, 12AT7/12AZ7. Solid state rectifier.

Size 8-3/4"H, 19"W (for rack mounting) and 7-3/4"D. Weight 50 lb. Sold from 1961-1971. Last retail price $275.00

MI-200AB (type K-107) Tube. Mono.

ELECTRICAL: 200w. Response: 20-20kHz (+0 -0.2dB). Distortion 1.0%. Noise & hum -85dB. Output impedance: 4, 8, 16.5, 25, 66, 100 and 600 ohms. 600 ohm output is balanced to ground. All low impedance outputs can be isolated from ground. Output voltages 25, 57.5, 70.7, 115, and 141.4V. Danping factor 10. Input impedance 250k. Input sensitivity 0.5V. Output tube bias controls. Line voltage adjustment for 108, 117 or 125V.

INPUT TRANSFORMERS: M-107 or M107A: 50, 250 or 600 ohm (-14dBm), M-108: 20k bridging (12dBm), M-180: 250 or 600 ohms (-24dBm).

MECHANICAL: Grey hammertone chassis. Separate amplifier and power supply chassis. Line voltage switch: 117 or 125V. Audio input.

AMPLIFIER FRONT PANEL: Gain control. Power switch: on or off. Meter. Meter switch.

TUBES: 2-8005 output, 2-6BX7, 2-6AV5, 12AU7, 12AX7, 2-5Y3, 4-5U4.

Amplifier size 10-1/2"H, 19"W (for rack mounting) and 9"D. Power supply size 7"H, 19"W (for rack mounting) and 9"D. Weight 140 lb. total. Sold from 1957-1967. Last retail price $640.00

MI-350 Tube. Mono.

Similar to MC3500. Sold from 1968-1971. Last retail price $1150.00

 

 

 

Other Special and Industrial Amplifiers

26B Westrex 30w amplifier

A-27 Westrex 60w amplifier

A-109

A-120

Curtis-Wright amplifier

K-100 150 watt amplifier

Link 20w amplifier

I. T. Verdin 100w amplifier

MC40 modified for Barrett Electronics

MC50 modified for Maico with 3-conductor 170024 grounded power input cable

MC50 modified for Minneapolis Honeywell with 20w output, 0.1V input

MC50 modified for Motion Picture with 600 ohm input transformer M-108

MC75 modified for Square D (A-129)

MC75 modified amplifier with 1200 ohm output
MI-10

MI-75 modified for Sanborn, 60Hz power supply

MI-75 modified amplifier with 1200 ohm output

MI-75 modified for General Electric
 
MC100 modified for Columbia records with input transformer

MI-200 modified amplifier with 4 to 400 ohm output

MC225 modified for Audio Lab

MC240 modified for Grason-Stadler (162K) (Dec. 1962)

MC250 modified for Grason Stadler amplifier

MC2300 Navy version with 6, 25, 30, 64, 120, 182, & 256 ohm output

MC2300 modified for Sanders Associates

MC2300E modified for Bolt, Beranek & Newman with 50, 100, 200, & 400 ohm outputs

MC2500 Navy

MC2500 modified for Westinghouse

MC2500 modified for Western Research (Sept. 1986)

MC2600 modified for Western Research

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