Crown D-150 - Product Description; General Overview

FIGURE 1-4,
INTEGRATED CIRCUIT STEREQ
2-150 AMPLIFIER
1.1 ‘SCOPE OF MANUAL
This matidal is intended to provide the User and sérvice tech-
nician necessary technical information required to install, oper-
ate and repair the CROWN D-150 Dual-Charnel Power Amplifier
properly and to maintain the unit in optirmum operating condition.
The manual is. comprehensive; containing a physical description
of the.0-150, electrical and mechanical specifications, complete
installation atid operating instructions, a detailed circuit descrip-
tion and service procedures to include troubleshooting and repair.
Also. included are.complete parts lists,.a unit schematic and.ex-
ploded view drawings to assist in identification of parts and under-
standing the functional operation of the D-150. amplifier.
A thorough reading of this manual and strict adherence to the in-
structions, procedures and cautions will assure many years of pro-
fessional quality service and listening enjoyment from your
CROWN D-156 Dual-Channel Power Amplifier.
1.2 EQUIPMENT DESCRIPTION
Tre 0-150 isa dual-channel medium power amplifier for ultra-low
distortion amplification from 5Hz to 20KHz with operation into
loads of 4-ohms:and higher. The-unit features extremely tow har:
monic and intermodulation distortion, very low noise, highest
“damping factor,” and quality parts and workmanship. The unit
may be wired to produce a balanced 50 volt monaural output. The
amplifier is fully protected against misrretched and shorted loads
by a resetting V-1 (volt-ampere) limiter having no obnoxious
muting or program delays. A thermal switch removes power from
the unit if overheating occurs due to insufficient ventilation.
The power supply features large computer-grade filter capacitors
giving over 20 joules of energy storage.
A total of 24 discrete transistors, 1 linear IC (dual op amp), 20
diodes and 1 bridge rectifier are utilized in a CROWN-ploneered
Class AB+B output circuit. The effective number of semi-
conductors is 40 transistors and 30 diodes.
The input voltage-ampiifiers, (IC), are powered by two voltage-
regulated supplies. This results in complete channel-to-channel
isolation and independence from line voltage variations.
Two level controls are mounted adjacent to the inputjacks to allow
balancing and optirnizing of systern levels.
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