McIntosh C 34 V Service Manual

Page 1

C34V

AUDIO/VIDEO CONTROL CENTER

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CONTENTS

Performance Specifications .................... 2 Section 5 - Compandor and Compandor
Top and Front Views .......................... 3 Switching .................... 23-27
Rear View .................................... 4 Section 6 ~ Loudness and Balance ......... 2829
General Notes ................................ 4 Section 7 - Equalizer ..................... 29-33
Section Locations. _ ..r . Section 8 - High and Low Filters, Audio Muting
Block Diagram ............................... 6-8 and Output Selection .......... 34<36
Interconnection Diagram Parts List .............. 8 Section 9 - Top Cover Controls ............ 37-38
Front Panel and Trim Parts List ................. 8 Section 10 - Monitor Amplifier ............. 39-41
Installation Hardware Parts List ................. 8 Section 11 -- Listen/Record Selectors, Record
Section 1 - Interconnection Diagram ........ 941 Monitor Switching, Turn-on
Section 2 - Phono Preamp and Switching Display and Muting Drive ..... 42-45

Assembly .................... 1244 Section 12 - Pushbutton Indicators ......... 4547
Section 3 - High Level Input and Tape . Section 13 - Power Supply and Auto-0n .... 47-49

Switching (Left) ............... 15-1 7 Repacking instructions ....................... 50
Section 4 - High Level Input and Tape

Output Switching (Right) ....... 18-22 A. ,

www.AUD10CLASSIcs.com

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3501 Old Vestal Road,_Vestal, NY 13850
Phone/Fax: 607-766-3501

HIEIIIIQSH Service Manual

Page 2

Performance
Specifications

Preamplifier Section

FREQUENCY RESPONSE
+0, -O.5dB from 20Hz to 20,000HZ

MAXIMUM VOLTAGE OUTPUT
10 volts from 20HZ to 20,000Hz

TOTAL HARMONIC DISTORTION
001% maximum from 20Hz to 20,000Hz at rated output

SENSITIVITY
Phono - 2mV for 2.5V rated output (0.4mV IHF)
High Level - 250thor 2.5V rated output (50mV IHF)

SIGNAL TO NOISE RATIO, A-WEIGHTED
Phono - 90dB below 10mV input (84dB IHF)
High Level # 100dB below rated output (86dB IHF)

MAXIMUM INPUT SIGNAL
Phono - 100mv
High Level - 20 volts

INPUT IMPEDANCE .
Phono - 47k ohms and 65pf capacitance
High Level - 50k ohms

EQUALIZATION CONTROLS
Variable 12dB boost to 12dB out at center frequencies
of 30, 150, 500, 1500, 10k Hz

COMPANDER RATIOS
From 1:2 compression to 2:1 expansion

LF FILTER
Flat or roll-off at 12dB per octave below 50 Hz.

HF FILTER
Flat or roll-off at 12dB per octave above 7,000 Hz.

Monitor Amplifier Section

CONTINUOUS AVERAGE POWER OUTPUT
20 watts per channel into 8 ohms, from 20 Hz to 20 kHz,
at 0.01% maximum harmonic distortion

FREQUENCY RESPONSE
+0, -0.2dB from 20Hz to 20,000Hz

SENSITIVITY
750mV for rated output (170mV IHF), input impedance
is 27K ohms

SIGNAL TO NOISE RATIO, A-WEIGHTED
100dB below rated output (87dB IHF)

General Information

SEMICONDUCTOR COMPLEMENT
31 Bipolar Transistors
76 Field Effect Transistors
85 Integrated Circuits
107 Diodes
1 Silicon Controlled Rectifier

AC POWER OUTLETS
1 green turntable current sensing, 100 watts
2 red unswitched
3 black switched
1440 watts total capacity

POWER REQUIREMENTS
120 volts, 50/60 Hz, 25 to 85 watts

Mechanical Information

SIZE:
16-1/8incheswide(40,6cm)by5-7/16incheshigh
(13.8 cm) by 13 inches deep (38 cm), from the mounting
surface, including PANLOC shelf and back panel
connectors. Knob clearance required is 1-1 /4 inches
(32 cm) in front of the mounting panel

WEIGHT:
26 pounds (118 kg) net, 38 pounds (172 kg) in
shipping carton.