MARANTZ MODEL 2600 (USA-JAPAN 1978)
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The marantz Model 2600 from 1978 was the most powerful stereo receiver by marantz (owned by Superscope at this time) and it was almost the most powerful receiver from the "monster receiver" era. (The most powerful was the Technics SA-1000 - see below). The Model 2600 is an updated version (with added Quartz Locking tuner circuit) of the previous Model 2500. Powered by a Toroidal Dual Power Supply, Turbo-Flow heat dissipation system, 9 kHz 18 dB per Octave Bessel-derived high filter, 15 Hz 18dB per Octave Butterworth-derived low filter and variable tone turnover points will deliver 300 Watts per channel into 8 ohms, Minimum Continuous Power from 20 Hz to 20 kHz with no more than 0.03% THD. The FM section features Quartz-Lock tuning system, Phase Locked Loop multiplex demodulator, 5-Gang dual gate MOSFET FM front end as well as a 2-inch Oscilloscope Display from Hitachi. True Power is the capability of a receiver to deliver more power into 4 ohms than into 8 ohms according to FTC regulation thus the Model 2600 will deliver 400 Watts per channel into 4 ohms. This huge receiver measuring 490*177*438 mm and with a weight of 32 kg was designed in the U.S.A. and produced in Japan. Its original sale price was 2998 DM in Germany. An optional walnut veneer cabinet, the WC-124 was also available.
PIONEER SX-1980 (JAPAN 1978)
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PIONEER presents the greatest DC power story ever told. It's a simple fact of life that the purer power a receiver possesses, the easier it can reproduce music without straining. And at 270 watts per channel, even the most demanding piece of music will hardly cause the SX1980 to flex its considerable muscle. Each channel, for example, has a separate DC power configuration that helps to provide richer and more accurate bass. Pioneer has developed a 22-pound toroidal core transformer that's far less susceptible to minor voltage variations. So you get cleaner, clearer sound. Instead of pushing power transistors to their limits Pioneer invented new transistors that last longer and eliminate the need for fans that can cause electrical interference. All these innovations give the SX1980 a total harmonic distortion level of less than 0.03% from 20 to 20,000 hertz. Inside the SX1980 there's a quartz crystal generating the perfect frequencies of every FM station, so as you rotate the tuning dial, a special integrated circuit compares the station you're trying to tune to its perfect frequency. When the station is tuned exactly right (all this takes about half a second), a "fine-tuned" light comes on; the receiver then senses when you let go of the tuning dial and automatically "locks" onto that broadcast. Technical data: 270 W/ch (min. RMS, 8 ohm 20-20,000 Hz, no more than 0.03% THD) Dimensions: 560 W x 211 H x 497 D mm Weight 35.4 kg.
SANSUI G-22000 / G-33000 (JAPAN 1978)
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Each Sansui receiver was crafted with meticulous care. The Sansui G-33000 and G-22000 were two from the top of Sansui's "Pure Power Receiver" roster featuring the world's best audio amplifier performance. Both are very powerful, with the only difference between in actual power output, and both are as versatile as any receiver from this era. Circuitry is ultra-advanced with revolutionary Diamond Differential DC (Sansui pat.): this allows power amplifier to achieve low TIM distortion / high slew rate / fast rise time to respond to pulsive, musical signals with superb accuracy. Frequency range also benefits - widened to zero Hz (DC) to 300kHz! The "Straight DC" design means phono equalizer, flat amp and power amp are all of DC design. Both models also have a unique "separable" two-unit construction, one is the tuner / preamp while the other is the power amp. This allows you to arrange them as you like, side by side, one on top of other or you can join them together back-to-back for a singular unit. Technical data: Power output 300 W/ch (min. RMS, 8 ohm, no more than 0.009% THD - G-33000) 220 W/ch (min. RMS, 8 ohm, no more than 0.009 THD - G-22000) Dimension: 636 W x 227 H x 553 D mm (G-33000 / G-22000) Weight 45.4 / 42.1 kg (G-33000 / G-22000)
TECHNICS SA-1000 (JAPAN 1977)
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Introducing the Technics SA-1000. One of the most powerful receivers ever made: 330 Watts per channel minimum RMS into 8 ohms from 20 Hz-20 kHz with no more than 0.03% total harmonic distortion. To capture the sheer dynamics of a live symphony, there's an equally dynamic amplifier section. Like 72,000 microfarad worth of high capacitance filtering, separate DC rectifiers, current-mirror loading and direct coupling. The results are impressive: tremendous reserve power, negligible transient crosstalk distortion and excellent stability. As good as all that sounds, Technics Acoustic Control makes it sound even better, because it adds low and high range boost and filter switches to enhance the tone controls. There's also a midrange control with a variable center frequency, 24 LED peak-power indicators and automatic load impedance detector.
