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Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *

Crown Straight Line Two

Name: Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *
Brand: The Turntable Store
SKU: crown-set-straight-line-two-preamp-power-line-three-amplifier-fm-two-tuner-fully-serviced
Availability: InStock

Stereo Pre Amplifier (1983)

Specifications

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.009%

Gain: 30dB (MM), 20dB (line)

Input sensitivity: 250mV (line)

Output: 250mV (line), 2.5V (Pre out)

Weight: 5kg

Year: 1983

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Crown Power Line Three Power Amplifier Review

Unlike the variable-mode (or variable-class) circuits used in some other amplifiers, which affect only the output stage, the Multi-Mode circuits control the operating conditions of the three highest-level amplification stages (pre-driver, driver, and output). At low output-power levels (up to 20 milliwatts) all three stages operate in class-A mode, which is inherently completely free of crossover distortion as well as being the most nearly linear amplification mode. Crown points out that with ordinary music program material the amplifier actually operates in this mode most of the time. As the instantaneous power of the signal waveform rises above 20 milliwatts, the output transistors change to class-B operation, the highest-efficiency mode of a linear audio amplifier. Since the drivers and pre-drivers continue to operate in class A, Crown calls this the “Class A plus B” mode.

Finally, at the highest power levels, the driver and pre-driver stages change to class-AB operation so that they can drive the output transistors (operating in class B) to their full power output (a class-B amplifier requires actual driving power, instead of only a voltage or current input, in order to develop its full output). Crown refers to this as the “Class AB plus B” mode. These three basic operating conditions of the Multi-Mode circuit vary more or less continuously throughout the signal waveform and are separately determined for the positive and negative portions of the waveform cycle.

The Power Line 3 is protected against overdrive or improper load conditions by several internal systems. A fast-acting limiter instantaneously holds the output power to a maximum safe value in the event of an output short or undesirably low load impedance. According to Crown, this circuit produces a muffled snapping sound when it operates, but it will not be activated if the load impedance is 4 ohms or higher. Since the Power Line 3 is completely direct-coupled from its input jacks to the speaker outputs, the speakers are protected with a low-frequency interrupt circuit that places the amplifier in a stand-by mode if it senses more than 10 millivolts of direct current at the output. Each channel has its own thermal protection system, which also places the amplifier in stand-by mode until it has cooled to a safe temperature. Finally, an a.c.-line fuse protects the entire amplifier against a catastrophic internal failure. The very comprehensive manual for the Power Line 3 provides recommendations for fusing the speaker lines externally.

The Crown Power Line 3’s front panel has a silver-colored satin finish with matching handles and knobs. The chassis and large heat-sink fins that extend to the rear are finished in fiat black. The front panel contains a pushbutton power switch, two in-put-level knobs with thirty detented settings, and a headphone jack. Two groups of colored LED’s between the knobs, designated a “Frequency Analyzing Display,” show the approximate frequency content of the program (for each channel, yellow, green, and red lights, respectively, come on for low-, medium-, and high-frequency signals). Above the display are two red lights marked IOC (input/output comparator). The Power Line 3 has circuits that constantly compare the input and output waveforms, and any difference between them causes the corresponding channel's IOC light to flash. This is a very sensitive type of clipping indicator whose warning signal precedes any audible distortion.

The Crown Power Line 3 is 19 inches wide, 10-l/8 inches deep, and 5-1/4 inches high (the handles extend 2-3/8 inches in front of the panel). It weighs about 25 pounds. Price: $949.

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Crown FM-2

FM Stereo Tuner (1985)

$525.00

Original: $1,500.00

-65%

Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *—

$1,500.00

$525.00

Original: $1,500.00

-65%

Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *—

$1,500.00

$525.00

Description

Crown Straight Line Two

Stereo Pre Amplifier (1983)

Specifications

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.009%

Gain: 30dB (MM), 20dB (line)

Input sensitivity: 250mV (line)

Output: 250mV (line), 2.5V (Pre out)

Weight: 5kg

Year: 1983

--------------------------------------------------------------------------------------

Crown Power Line Three Power Amplifier Review

The Crown Power Line 3 is 19 inches wide, 10-l/8 inches deep, and 5-1/4 inches high (the handles extend 2-3/8 inches in front of the panel). It weighs about 25 pounds. Price: $949.

--------------------------------------------------------------------------------------

Crown FM-2

FM Stereo Tuner (1985)

Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *

Crown Straight Line Two

Specifications

Crown Power Line Three Power Amplifier Review

Description

Crown Straight Line Two

Specifications

Crown Power Line Three Power Amplifier Review

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