Soundcraftsmen PCR-800
Eighteen pounds, 205 watts per channel, and a cooling system that will happily run into a dead short without flinching.
Overview
Pick up a PCR-800 and the first thing that registers is how little there is to pick up. Eighteen pounds for a stereo amplifier rated at 205 watts per channel into 8 ohms is the kind of number that makes you check the spec sheet twice — the thing measures roughly 4⅞ inches tall, 8½ inches wide, and 12 inches deep, which is small enough to tuck almost anywhere. Soundcraftsmen built its whole pitch around that contradiction, and the PCR-800 was the amplifier that carried the argument.
What separates it from a conventional power amp is Phase Control Regulation, the technology the company developed and named the amp after. Instead of the usual diode rectifiers feeding the output stage, the PCR-800 uses silicon-controlled rectifiers governed by a precision-referenced feedback loop, with multiple temperature sensors distributed through the chassis feeding an electronic control circuit. Under normal conditions the amp loafs along with a quiet, slow-turning fan and a green "PCR" lamp blinking on the front panel. Push it hard and the fan steps up to a distinctly audible high speed; if that still isn't enough, the regulation circuit lowers the supply voltage at the output devices themselves, shedding dissipation rather than shutting the amplifier down. The blinking lamp speeds up to tell you it's happening. Two red "Truclip" LEDs round out the front-panel display and light when the amplifier is clipping.
The payoff is load tolerance that borders on the absurd. Soundcraftsmen rated the PCR-800 at 205 watts per channel into 8 ohms from 20 Hz to 20 kHz at under 0.05% THD, 300 watts per channel into 4 ohms, and 275 watts per channel into 2 ohms, plus 600 watts in bridged mono mode into an 8-ohm load. The company's own advertising claimed operation into any impedance down to zero ohms and boasted that even a dead short wouldn't harm the amplifier — claims that read like marketing until you understand the regulation scheme behind them. Current limiting, the usual protection approach, was eliminated entirely in this design, which the manufacturer argued also removed the sound degradation that current limiting tends to introduce. Audio (August 1984, p.57) put a review sample on the bench and got 211 watts per channel into 8 ohms at mid-frequencies, with 205 watts per channel maintained at the 20 Hz and 20 kHz extremes, and 305 watts per channel into 4-ohm loads. The same review measured THD at 0.01% mid-band, 0.038% at 20 Hz, and 0.04% at 20 kHz at rated output.
That same Audio profile (August 1984, p.57) is worth reading closely for what it says about the design philosophy. Because the PCR supply is tightly regulated rather than deliberately soft, the amplifier's IHF dynamic headroom measures no more than a fraction of 1 dB — a figure that looks unimpressive next to amps built around sagging supplies that can dump huge power into brief peaks. The reviewer's point was that high dynamic headroom isn't inherently desirable, just one approach among several, and that the stiff-supply PCR design holds its continuous rated power better under the line-voltage variations found in real homes. The remaining published numbers back up the serious intent: signal-to-noise ratio greater than 105 dB, slew rate above 40 V/µs, rise time under 2.2 microseconds, and frequency response of ±0.1 dB across 20 Hz to 20 kHz. The reviewer's summary was blunt — Soundcraftsmen said little about how the PCR-800 sounded, which the reviewer considered a pity, because it delivered clean and accurate sound on top of the stable power.
Owners report the practical upside of all this is an amplifier that simply doesn't flinch. Speakers whose impedance dips well below their nominal rating — the kind of load that sends lightweight amps into repeated thermal shutdown — are exactly the case the PCR circuit was built for, and the amp's ability to keep running rather than protect itself out of the music is the reason people still seek these out. The trade-off is the fan. At low speed it's unobtrusive; at high speed it makes itself known, and in a quiet room during a long loud session that's a real consideration. The front panel is otherwise austere: a single on/off rocker switch and the indicator LEDs, nothing else. It was sold at $449.00, and later catalog appearances list it at $499.00. Soundcraftsmen also marketed a PC-1 Power Coupler, a $39.00 accessory that let the amp be hung off the speaker terminals of a receiver or integrated amp that lacked preamp outputs — a way to add the PCR-800's power without replacing an existing tuner section. The amplifier was built in the U.S.A. and is a high-current design by the manufacturer's own description.
Collectors note that the PCR-800 exists in a couple of related forms worth distinguishing. A rack-mount variant appears in period material mounted in an optional 19-inch rack panel, and a later listing describes the plain-overlay-front-panel PCR-800 as similar to the company's PRO-POWER ONE. There is also a separate PCR800X2 model — two independent power supplies, dual transformers, two-speed fans, dual AC switches, rated at 205 watts per channel into 8 ohms across four channels for biamping — which is a different amplifier and shouldn't be confused with the single-chassis PCR-800. Prices and availability on the used market are not documented here; buyers should expect the usual caveats about a forty-year-old amplifier with a fan and an SCR-based regulator, and should verify condition and service history before committing.
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