Soundcraftsmen mono amplifier pcr 800 where was manufactured?

#SOUNDCRAFTSMEN MONO AMPLIFIER PCR 800 WHERE WAS MANUFACTURED? FREE#

The distortion of the PCR800 was not only very low, but always decreased with decreased power output (many amplifiers have more distortion at lower power levels than at rated power). In fact, when driving 4- and 8-ohm loads, the dynamic output was actually less than the steady-state clipping output. This is probably due to the tight regulation provided by the PCR power supply, in contrast to the essentially unregulated supplies of many other amplifiers. It was also interesting to find that the dynamic headroom was less than we have measured on many other amplifiers. Since it generally met or surpassed its performance specifications, this merely suggests to us that the published specifications of the amplifier are closer to its actual performance than those of some other amplifiers. The clipping headroom of this amplifier was somewhat less than we have been measuring in recent times. There were no unwelcome surprises during our tests, and the amplifier appeared to live up to the 'bulletproof' status that is implied by the manufacturer's literature. The red TRUCLIP LED indicators glowed when either channel's output was clipped even slightly. During our measurements of distortion and clipping power, the fan frequently speeded up (this has no effect on the operation of the amplifier), but it usually slowed down again within moments after we reduced the input signal. Within a couple of minutes after we reduced the drive level, it returned to normal operation and the fan speed was lowered. The amplifier's exterior remained cool except at the air-exhaust slots. Before the required hour had passed, the PCR circuits had reduced the amp's supply voltage sufficiently to limit the output to perhaps 30 or 40 watts (which is still adequate for most home listening needs). When we drove the PCR800 at one-third rated power for the standard FTC preconditioning process, its fan switched to high speed within a minute or two. Continued high-level operation causes the supply gradually to reduce the voltage to the output stages, thereby limiting the maximum deliverable power and the corresponding heat generated to safe values without shutting the amplifier down. In normal service, the PCR power supply delivers just enough current to the amplifier to meet the output-signal requirements, thus minimizing the generation of unnecessary heat in the unit. Thermal sensors on critical parts of the amplifier will increase the fan speed with rising temperature, however. Normally the fan runs very quietly at a low speed. Air enters in the rear and exhausts through slots in the front panel. Since the MOSFET's will get hot under extreme high-signal conditions, the amplifier is fan-cooled. Bridged operation turns the PCR800 into a 600-watt mono amp. Low-impedance power ratings are 300 watts per channel into 4 ohms and 275 watts into 2 ohms. The PCR800 has no conventional current-limiting protection circuitry, but it is able to drive low load impedances (even a short circuit) indefinitely without damage or even a temporary interruption of service.

#SOUNDCRAFTSMEN MONO AMPLIFIER PCR 800 WHERE WAS MANUFACTURED? FREE#

These transistors are inherently free from 'thermal runaway' effects, which can easily destroy a typical bipolar-transistor output stage unless it is protected against excessive output current. The result, Soundcraftsmen's PCR800, can deliver 205 watts per channel, yet it weighs less than 21 pounds and measures only 8-1/2 x 12 x 4-7/8 inches.ДЄlso contributing to the amplifier's impressive overall performance is the use of power MOSFET's (metal-oxide semiconductor field-effect transistors) in the output stages. The technique is an efficient and space-saving means of controlling the average power supplied to the output stages of an amplifier without compromising the performance of those stages. One answer comes from Soundcraftsmen in the form of a power amplifier that uses a technique called phase-control regulation in its power supply. Designing an amplifier that is relatively compact, lightweight, and inexpensive but can deliver large amounts of 'clean' power is an engineering problem that calls for innovative solutions.

Soundcraftsmen mono amplifier pcr 800 where was manufactured?