Setton RS660 Receiver

Concept 16.5
Hitachi SR-2004
Kenwood KR-9050
Marantz SR-9000G

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Pioneer SX-1250
Rotel RX-1603
Setton RS-660
Toshiba SA-7150

More Favorite  Receivers

Some people collect houses while others collect "barn find" vintage cars. Others collect exceedingly rare coins. My aspirations are a bit more humble: I collect vintage Stereo Receivers from the 60's, 70's and 80's, many of which were no doubt retired to the local Goodwill or Salvation Army Boutique long before the "vintage" collecting craze caught on. These were the stereos that I dreamed of owning as a poor college student in the 1970's.

At one point, my vintage receiver collection numbered around 120, however, I gave most of those away in 2008 in what has come to be known as "The Great Receiver Giveaway" and now the collection is down to a paltry 30 or so.

This web site is about the vintage receivers I decided to keep and why I kept them. The ones I kept wre those that had a significant impact either technologically and/or saleswise. I used to sell Stereos for University Stereo in the late 70's, at the height of the "Power Wars" so many of this units I am intimately acquainted with, having A/B'd them on a professional swithing system countless times. Since our store also did repairs in house, I am also well aware of which units came through the back door and why. So, this web site is not about ALL vintage receivers, just the ones I collected so that others who own them, or want to, can find useful information.

Please click on the links above for a detailed description of the "stars" of my collectoin. In addition to photographs, many of the descriptions include reviews, brochures, manuals and spec sheets I have found as well as links to other interesting information. I've also included a couple pages about some lesser known receivers from my collection that are "still worthy" and tend to be priced well under the radar for those of you who are looking for something off the beaten track to enjoy in your E-Bay treks. Speaking of which, if you are going to quote my reviews in your auctions on E-bay, please give this site appropriate credit.

Lastly, if you have any information about any of the receivers presented here and would like to share it, please feel free to e-mail me. Requests for free receivers will be respectfully ignored. Please note that I am not buying or selling any Receivers at this time. This web site is purely for informational purposes.

NEW! I don't know about you, but back in the 70's I eagerly awaited each new issue of the mainstream stereo magazines to see the newest test reports and see the ads for the last audio gear. I just learned of these links to the complete collections the classic American audio magazines: Audio, High Fidelity and Stereo Review, which feature very reviews of many classic receivers. WARNING: Very Addictive!

Chris (
January 23, 2020








In 1978 the Concept 16.5 Receiver retailed for $950.00 and has the distinction of being the most powerful receiver ever fielded by a so-called "house brand", in this case, Pacific Stereo, a subsidiary of CBS. In fact, many vintage receiver collectors regard the Concept 16.5 as one of the best receivers ever made by anyone. The circuitry was designed by Dick Schram, who went on to greater glory as the founder of Parasound. Rumor has it that Dick still collects 16.5s. (He was also kind enough to mention this web site in an article he wrote about the roots of Parasound.) I know for certain that he autographed the case of a 16.5 for my friend SoCal Sam. According to my Tech, Tom Ishimoto, former Manager of Product Development for Marantz, the Concept Receivers were built in Japan by Tandy Electronics Corporation (TEC). For operating information, see the Owner's Manual and for more information about the entire Concept receiver line, see the Brochure.

The standout feature of the 16.5 was its "dual mono" design with huge twin power transformers (see second photo from the left). This design was originally pioneered in receivers by the H/K 930 about 5 years before the Concept. But the 16.5 was a true monster, rated at 165 w/ch RMS, with a damping factor of 450, much higher than any other contemporary receiver, which were usually rated less than 100. This was a "spec" you can really feel. In fact, the bass output on the 16.5 is simply stunning, powerful and crisp, and it is difficult to believe that a Receiver is capable of such powerful sounding output. While a damping factor of 450 is hard for some to believe, check the specifications for yourself in the Specifications above!

Rumor has it that Pacific Stereo did not want to embarrass the other manufacturers whose gear they retailed so they did not submit the 16.5 for review by any of the audio magazines of the era. So, there are no published reviews for it.

My 16.5 is shown above, on the far left, with its trusty companion, the matching Concept 2QD Quartz Direct Drive Turntable. The 2QD (link to manual and brochure) was supposedly manufactured by Toshiba and was the only turntable ever marketed as a "Concept" by Pacific Stereo. It was sold along with the cutting-edge ELC Cassette Deck (.pdf of the Brochure) and the Concept CE-1 and CE-2 "Heil Air Motion Transformer" Speakers (thumbnail, far right).  I really like the way this combo makes one of my favorite LPs, especially Rosie Vela's Zazu, sound ("Magic Smile" video).

Note: If you have a Concept that is in need of repair or restoration, this guy knows his stuff: Pacific Stereo Repair. Here is a 16.5 restoration he did. Well worth saving as the prices on these go up and up!


The following technical information is quoted directly from the Concept 16.5 Owner's Manual:


"A dual-gate MOSFET and 5-gang tuning capacitor provides Concept with excellent sensitivity and immunity to overloading from very strong local signals. Concept also has an extremely steep quieting curve to achieve an outstanding signal-to-noise ratio on very weak signals.

The IF section utilizes three hand-picked, linear-phase ceramic filters to maximize selectivity while still keeping distortion extremely low.

Precise impedance matching of the limiter to the IF filters is also important in keeping distortion low. Concept accomplishes this by using three high-gain symmetrical limiters, which have over 90dB of gain. The detector package is also high-gain, with a wide-band, low distortion full quadrature detector. Overall gain for the IF system is better than 130dB, assuring you of noise-free, low-distortion reception even on the weakest signals.

A Phase-Locked Loop IC chip in the multiplex decoder keeps the tuner perfectly synchronized to the transmitter to achieve maximum stereo separation and the lowest possible distortion. Steep 19 and 38 kHz filters are built in; these eliminate spurious output signals without rolling off desired audio frequencies. This is especially important when making a Dolby-ized tape recording off the air, as such spurious signals can interfere with the Dolby process."


"The Concept 16.5's power amplifier uses direct-coupled, fully complimentary driver and output stages, with four output transistors per channel to increase reliability. The transistors are mounted on extruded aluminum heatsinks for maximum heat dissipation, another measure promoting long transistor live. Two differential gain stages provide the lowest possible distortion at any power level.

A slew rate of approximately 38V/ms assures excellent square wave response, even at 10KHz. The slew rate exceeds the minimum required by over a 5 to 1 margin, indicating frequency response extended far beyond specification, and insures the clarity and transparency inherent only in a wide-bandwidth design, with no sacrifice in ruggedness.

An active protection circuit senses excessive current in the output stages and then disconnects the speakers until the fault has been removed. This circuit protects the output transistors, and also prevents DC from reaching the speakers and damaging them.

The Concept 16.5 is the only high powered receiver that features entirely independent dual power supplies. This ensures that each channel can deliver it full output power at all frequencies under all conceivable drive conditions. The benefits of independent power supplies extend beyond that: they insure musical clarity. In a conventional amplifier, heavy power demands in one channel induce cross-modulation into the other, and this crosstalk obscures fine inner musical detail. Independent dual power supplies insure that each channel will reproduce all the detail, with no crosstalk, no matter what the demands on the other channel. This enhances clarity and improves stereo imaging.

Each channel of the Concept 16.5 has its own oversized power transformer, heavy-duty bridge rectifier, and a pair of 10,000 uf high-voltage electrolytic capacitors. Low-level power supplies are obtained from separate transformer windings and are fully regulated for complete isolation from the power supply.

A separate relay is used to switch each pair of speakers, assuring that all the power is available to them."


May be the best sounding receiver ever, solid build quality, excellent tuner, massive heatsinks

Bland/anonymous styling, faceplate dings/scratches easily, rosewood vinyl covering on case, LEDs in push buttons can be problematic







The 1976 Pioneer SX-1250 literally set the audio world on its ears in when it was introduced in 1976. All of a sudden, Pioneer Electronics was now the Top Dog in the mainstream audio world with this sensational looking 165 w/ch RMS receiver. I was a Junior at UC Irvine when I first heard about the SX-1250. And, after seeing it, I wanted one BAD! Thirty years later, that dream came true. I also got the successor model SX-1280 around the same time, but as you can see from the photos above, the SX-1250 is the better built of the two. Simply put, the SX-1250 was the high water mark for receiver engineering (video of restoration).

Pioneer's SX-1010, the top model before the SX-1250, had signaled the start of the legendary "Power Wars" in 1975, where most of the audio manufacturers of that time attempted to outdo each other with progressively more powerful receivers, reaching outlandish sizes and power outputs. The 1010 also marked the ascendency of the Japanese autio industry which had not been taken very seriously before it arrived. The 1010 was quickly topped by the Marantz 2325, then the Sansui 9090 and the Kenwood KR-9400. So, Pioneer, not to be outdone by its erstwhile rivals, struck back convincingly with the SX-1250. It was a bold move. The 1250's "all Silver" look quickly took hold and was shamelessly copied by all the other manufacturers. The "Blue Light" era of the SX-1010 and Marantz 2325 was officially over!

But, the SX-1250 was about much, much more than mere cosmetic ruffles. First, and foremost, IT WAS BUILT LIKE A TANK! It was, and still is, considered one of the best built Receivers of all time. Its massive Toroidal Transformer power supply is still regarded as one of the best ever, with four hulking 22,000 uf filter capacitors. In fact, even though the subsequent SX-1280 was rated at 185 w/ch RMS, 20 wpc more than the SX-1250, the 4 filter caps in the SX-1280 were only 15,000 uf. And the 270 watt per channel SX-1980 had essentially the same power supply as the SX-1250, making the 1250 considerably over-engineered relative to its rated power and leaving the SX-1980 was left with very little dynamic range beyond its rated power, per the lab tests reported by High Fidelity in November 1978.

The construction quality of the SX-1250 was simply superlative with heavy shielding over every section. This attention to detail had simply not been seen in receivers before and was surely the height of Japanese construction quality for a mainstream recevier. And, the specifications of the SX-1250 were competitive with some of the finest separates of the time. All in all, the 1250 was a "tour de force"

k (brochure). That's why so many owners swear by it after having owned it almost 30 years! And, I have to agree. My SX-1250 is now over thirty years old, gets played just about every day and has never had to be repaired. It is 100% original.

The styling for the 1250 is very conservative and, for that reason it has held up quite well. In the rightmost photo, a 1250 sits atop an SX-1010 and beneath and SX-1280, 880 and 1980. The second photo from the right shows and SX-1250 beneath a D-7000, Pioneer's first digital tuner equipped Receiver. The unique styling of the D-7000 came and went quickly and no one else went there.

Soundwise, the SX-1250 is pleasant enough to listen to, but not particularly memorable except for the sheer power. The bass, like most Pioneers of this era is a bit muddy and brooding, lacking the punch and crispness of a Concept 16.5. However, the tuner section, even without Quartz Lock, pulls in weaker stations with exceptional clarity, where other receivers simple can't go there. Although the SX-1250 is relatively common on E-Bay for an admission price of around $1,000 to $2,000 mine will stay just where it is.


A true breakthrough product, exceptional build quality, commands respect, all discrete components, easy to repair, handsome, easy to repair with discrete components


Hitachi Brochure


The 1978 Hitachi SR-2004 Class G Receiver, retailed for $1,195.00  and has the distinction of being the fifth most powerful "all in one" Monster Receiver made during the "Power Wars" of the late 1970's and one of the least well known.  In fact, with its dynamic headroom specification of +3db, it just might have been the most powerful of all. And, it WAS the most powerful Class "G" Receiver ever made.

 Hitachi, which manufactured OEM electronics for most of the major audio manufacturers, was a relative late-comer to the Receiver "Power Wars" of 1970's. However, when Hitachi joined the fray with the SR-2004, they certainly put their best foot forward. Almost all the internal components in the SR-2004 were made by Hitachi, making this receiver a real rarity and somewhat of a "purebred". And, outside the box, it has a real presence about it.

The SR-2004 had most of the "bells and whistles" of the other Monster Receivers it was designed to compete against and a few unexpected extras like switchable IF Bandwidth (wide/narrow), "AutoLock" FM Tuning (triggered by changes in the capacitance when you touch the tuning knob) to prevent FM drift, and a SAW Filter. In fact the 5-gang front end on the SR-2004 was part of one  of the best analog receiver tuners ever. Be sure to take a look at the specifications pages above.

The SR-2004's deluxe features also included two (2) different Audio Muting levels, a front panel Mic Input w/ level control and a very comprehensive Tone Control section with bass, mid-range and treble controls with switchable frequency settings for the bass and treble controls. But, what really made the SR-2004 stand out was its "Class G" Amplifier, with a prodigious 200 w/ch RMS power output, placing it among the most powerful receivers ever made. In fact, according to a review from the December 1978 issue of "High Fidelity" Magazine (in middle photos above), it was capable of dynamic peaks of 400 watts/ch "that gives it a shot a first place in the receiver power race". When High Fidelity tested the SR-2004, it found that the power output was actually more like 240 w/ch RMS. And, better yet, the Hitachi stayed relatively cool, a good indicator for long transistor life. That's why the SR-2004 was popular most among sound reinforcement professionals and DJs. Roger Russell, former loudspeaker Guru for McIntosh Labs was kind enough to provide me with a copy of this review (for a measly $5.00) from his collection of audio magazines.

So, now you know a few of the reasons why the Hitachi SR-2004 is one of the greatest receivers ever made. The power supply was dominated by a huge Toroidal Power Transformer surrounded by four (4) huge capacitors, 2 per channel. All of the internal electronics were shielded by metal enclosures so that barely any wiring is visible.  And, of course, all eight (8) discrete output transistors on the massive heatsinks were proudly marked "Hitachi". There's nothing like being a purebred!

Unfortunately, Hitachi was never able to establish an audio brand identity in the American market, so the Hitachi audio line essentially disappeared after 1982 and the SR-2004 is now just a vague memory in the minds of most enthusiasts.

Functionally, the Hitachi gives up very little to the Pioneer SX-1250 performancewise. However, whereas most receivers sound "loud enough" with the volume set to 9:00, the Hitachi needs to go to 12:00 for adequate volume. Conversely, whereas most receivers are maxed out at 2:00, the Hitachi just keeps going to 5:00.

For the technically inclined, what follows is a description of "Class G" amplification from a forum at

Class G, Class H Amplifiers Explained:

Soundcraftsmen made some EXCELLENT sounding Class H amps. The Hitachi Class G amplifier allowed them to make a 200 wpc unit that could double that output as required for short periods. These are popular where high-power and cool-running are needed, such as in pro applications and in mobile (cars) systems due to their efficiency. I have four of the big Soundcraftsmen amps, and let me say again, they are GREAT sounding amps (or they have no sound of their own, I guess is the point of my comment).

Class G
Class G improves efficiency in another way: an ordinary class AB amplifier is driven by a multi-rail power supply. A 500 watt amplifier might have three positive rails and three negative rails. The rail voltages might be 70 volts, 50 volts, and 25 volts. As the output of the amplifier moves close to 25 volts, the supply is switched the 50 volt rail. As the output moves close to the 50 volt rail, the supply is switched to the 70 volt rail. These designs are sometimes called "Rail Switchers". This design improves efficiency by reducing the "wasted" voltage on the output transistors. This voltage is the difference between the positive (red) supply and the audio output (blue). Class G can be as efficient as class D or T. While a class G design is more complex, it is based on a class AB amplifier and can have the same clean characteristics as well.

Class H
Class H is similar to class G, except the rail voltage is modulated by the input signal. The power supply rail is always just a bit higher than the output signal, keeping the voltage across the transistors small and the output transistors cool. The modulating power supply rail voltage is created by similar circuitry that you would find in a class D amplifier. In terms of complexity, this type of amplifier could be thought of as a class D amplifier driving a class AB amplifier and is therefore fairly complex.

Here's a different point of view from an audio technician, "Ron", who e-mailed me in response to this page:

"My other comment has to do with your definition of Class G, where you state: "an ordinary class AB amplifier is driven by a multi-rail power supply". This is incorrect. Classes A to D are defined by conduction angle of the output devices, regardless of number or level of supply rails. (In Class A, output devices conduct at all times, through 360 degrees). In Class AB, between 180 to 360 degrees, depending on input signal level. In Class B, 180 degrees. In Class C (never used for audio), less than 180 degrees. In Class D, alternating conduction through a small angle.) In contrast, Classes G and up (coined in Advertising, rather than Engineering) define the power supply and not the output device operation. IOW, a Class G supply can still feed a Class A, AB, B (or even C or D) output stage."


600 WPC power meters (who else had those?), runs cool, rugged look

Bland, anonymous styling, vinyl covering on case, need to turn up the volume to tap into the power reserves




The 1979 Kenwood KR-9050 Receiver, retailed for $1,250.00 and has the distinction of being the most powerful receiver ever fielded by Kenwood features a "High Speed" amplifier rated at a romping 200 w/ch RMS. It directly followed the legendary KR-9600 and was largely overlooked, although it had a higher power rating by 40 w/ch RMS. In addition to the prodigious power output, the KR-9050 also incorporated Kenwood's most advanced tuner technology. To keep the power amplfier section cool, most of inside is comprised of a massive heatsink as you can see in the middle photo.

You can learn the more intricate details about the KR-9050's "High Speed" DC amplifier design, and see the rest of Kenwood's receiver ilneup for 1978, in this rare Brochure.

Soundwise, I consider the KR-9050 to be in the top rank of vintage Receivers. The tuner, with its Quartz Lock, adjustable IF bandwidth and two-level Stereo Sensitivity, features leaves little to be desired. A large number of stations come in "loud 'n clear". Better yet, the "Hi-Speed" "Dual Power Supply" amplifier is just that: lively and powerful. And, it looks very impressive with a real walnut case with subdued panel lights.

However, the switches are plastic with thin metal caps which can break off easily and I have seen some with that "toothless" look. The selector knobs, with plastic cores, also lack the affirming click of the Pioneer SX-1250 with solid metal machined knobs and set screws. 

Unfortunately, things got worse with Kenwood's follow-up to the KR-9050, the notorious KR-1000 "Galaxy Commander". At one point I had two of these, being enchanted with their "Star Wars" style. However, the plastic faceplates, and the wimpy amplifier, resulted in them being given away. One "Galaxy Commander" is shown atop a Sansui G-9000, which I also gave away, in the far right photo. The KR-9050's exceptional overall performance saved it from being a gift.


Strong performer in all respects, one of the very best of its time, exceptional analog tuner

Heatsinks are fully enclosed, knobs are plastic core with metal caps, feels a little cheaper than it should

Rotel RX1603 Receiver    

The 1976 Rotel RX-1603 Receiver, retailed for $1,100.00 and had the distinction of being the most powerful "all in one" Monster Receiver when it was first introduced in 1976 (180 w/ch RMS x 2). And, it was the most powerful Receiver ever made by Rotel, the British audio manufacturer. But, this should not come as a surprise since in 1976 Rotel also introduced the incredible RB-5000 Power Amplifier (shown at right, above) rated at an astounding 500 w/ch RMS x 2. I suspect that the RX-1603 has more in common with the RB-5000 than just the knobs!

The RX-1603 was of completely conventional design electronically, although the cabinet was designed to separate the front from the rear (tuner/pre-amp & amp.) because it was extraordinarily deep. This was similar in concept to the Sansui G22000/G33000, although not as well executed. Inside is a huge "Rotel" Toroidal power transformer with two filter caps the size of coffee cans. The front handles were not just for show, either. Given its bulk, weighing in at approximately 75 lbs., it was very difficult to move around without the handles. However, to ease repairs it can be seperated into two (2) components. This page details an RX-1603 rebuild.

I've listened to the RX-1603 a fairly regular basis and the sound is full and rich in detail. My speakers are not particularly sophisticated (yet) so the more esoteric elements of its performance I am not worthy to evaluate. It seems to be SIGNIFICANTLY more powerful that the Pioneer SX-1280, even though the rated power output is about the same. I read somewhere on the Net that the RX-1603 actually specs out a around 250 w/ch RMS, but I have not confirmed this.

The RX-1603 gained a degree of immortality after being featured on the cover of Stereo Review's issue covering the stunning rise of Monster Receivers in 1978. It's the second unit from the bottom in the rightmost photo. Personally, after the Marantz 2600, I think it's the most captivating looking Monster Receiver. The FM performance is a little weak, however, the amplifier section more than makes up for it by delivering a powerful, punchy bottom end that doesn't overwhelm the crisp highs and detailed mids. It's a keeper.


Massive presence just sitting still, beefy bass performance, solid feeling to controls

Massive pain to move even with handles, looks like the budget ran dry in back


The 1979 Marantz SR9000G retailed for $950.00 and has the distinction of being Marantz's first Digital Tuner equipped receiver. It was sold only in Europe, however, served as the design basis for the top of the line Marantz SR-8000 sold only in North America. Most audio collectors have considerable disdain for Marantz equipment from 1979 through the 1980's. Although not as big and powerful as the awesome Model 2500/2600 (shown in the middle photo) it replaced at the top of the Marantz lineup, the SR9000G was still a 1970's Monster Receiver in its own right at a benchtested 150 w/ch RMS. However, it marked a turning point in Marantz's fortunes, as the Company began a downhill slide after it was taken over (a .pdf of Marantz history) by Dutch electronics giant Philips.

Recently, I made the acquaintance of Richard Jordan, Product Manager, Product Development Manager and VP. Product Development/Marketing, who oversaw the development for all Marantz audio components, receivers, video products and loudspeakers from 1974 to 1987. Regarding the 9000G, he had this to say: "120v version available, was sold through the military PX & audio clubs..."

"I recall the 9000 was the last Marantz receiver built by Marantz Japan... Around that time Phillips (Netherlands) had bought the off-shore assets of Marantz, but Marantz USA kept the North American territory. John Ballantine did all the Marantz receivers till 87. Yes I could write a book about 2500/2600 it was a wattage horsepower race with Pioneer & Technics. Over lunch 1 day I was having with the pro-audio engineers we decided to design a receiver to kick butt.. 😳. We took our amplifier circuit from the 510m pro amplifier, tuner/scope from the best Marantz component line, designed a great phono preamp circuit here in the USA. Next I went to Japan with 1 of the pro engineers and we presented our plan for the 2500... It took the Japanese team about 2 weeks to confirm back their understanding. Then it took another 12 months going through tooling and evaluating prototypes in order to start mass production. At the start of production I was in Japan and hand carried back the 1st production samples. To say the least it was a big hit for sales and today a sano 2500/2600 can sell for $5-9K. In 1 of my (3) systems I still use a 2600... I have been offered big $$ for it but I intend to give to my son..".

"Some debate what stereo receiver was king of the hill?? But the 2600 had the most power plus scope, quartz lock tuner, incredible phono preamp. Unfortunately the competiton's jumbo receivers all failed the rigorous FTC preconditioning test. But since the 2500/2600 used the patented, servo-controlled tunnel heat sink from the pro amplifier 510M it did just fine when pushed hard... Regarding purchase price to employees, we typically could get significant discounts. But whenever I wanted a product, I would get it directly from Marantz Japan and handcarry back from Japan since I was over there 4 or 5 times a year.... "

So, Richard has confirmed that the SR9000G was developed at Marantz by the same minds that come up with the Model 2500 and 2600!

Unfortunately, though, the SR9000G was a Monster with obvious signs of cost cutting. Although manufactured at the same factory that produced the Model 2600, the buttons were plastic, not metal capped. Gone were Toroidal power transformer, "cooling tunnel" and "dual secondary" power supplies of the previous generation. Also gone were double ganged tone controls and, sadly, the brand-identifying "Gyro-Touch" tuning. And, the wood case was now covered with vinyl rather than real wood veneer. There was no metal case.

I took my SR9000G over to my friend Tom Ishimoto's shop (Tom used to work with Richard Jordan at Marantz and started about the time production of the 9000G ended) and he benchtested it at 150 w/ch, 20-20kHz at 0.022% THD,  a performance that puts it in the Monster Receiver league, albeit barely. Tom did not even  know about the SR9000G. That's how rare a bird it was.

Issues of cost cutting aside, I had my SR9000G redone with a real rosewood case by LBPete at Peter did a wonderful job as seen in the left three (3) photos. And, I hang onto it because I like the overall design a great deal. If the lens over the display had been aqua toned glass instead of plastic, the knobs solid metal and the case with a real wood  veneer, it would have looked and felt like a true top of the line Receiver for its era.


Unique styling, very satisfying performance, ample power

Build-quality is not what it should be for a TOTL Marantz, controls feel frail, vinyl case



The 1978 Toshiba SA-7150, retailed for $1,195.00 and has the distinction of being (according to Toshiba, but disputed by anyone owning the exceedingly rare Hervic HR150 manufactured by SAE) the "world's first" receiver with a Quartz Digital Synthesizer Tuner. In that way it was the forefather of all that was to come. It was also an FM lover's delight, since it also had built-in Dolby FM, switchable IF Bandwidth (wide/narrow), Hi-Blend and even Air Check (a white noise generator) for setting recording levels. Plus, all this FM wizardry came with a 150 w/ch RMS power amplifier with a "dual mono design" and a huge Toroidal power transformer. The Toshiba engineers were so fanatical about the power supply that the SA-7150 even had a separate power transformer for the tuner/pre-amp circuits. In every respect, it was the "state of the art" in 1978.

To quote from the Owner's Manual:

"The all-important power supply for the SA-7150 is divided into separate supplies for the pre- and power amplifier stages. the power amplifier supply is then further divided into independent left and right power supplies, employing separate pairs of high grade heavy duty electrolytic capacitors (15,000 uf x 2 per channel) and a massive Toroidal transformer for excellent regulation. The SA-7150 is thus able to deliver its huge reserves of power right down into the ultra-low frequency region with greatly reduced dynamic crosstalk distortion.

Big advances in audio circuit technology have given the SA-7150 Digital Synthesizer AM/FM Stereo Receiver an incredibly huge reserve of output power at practically non-existent distortion levels. Super-low-noise dual transistors (developed especially for Toshiba audio equipment) in the 1st-stage differential amplifier, and parallel push-pull connected power transistors (of particularly outstanding transient response) in the power stage, deliver 150 watts of power per channel (both channels driven) into 8 ohms from 20 to 20 kHz with no more than 0.05% THD."

Toshiba, which manufactured OEM electronics for most of the major audio companies during the 1970's, was a late-comer to the Receiver "Power Wars". However, when they joined the fray with the SA-7150, they certainly put their best foot forward. Almost all the internal components in the SA-7150 were made by Toshiba, making this receiver, like the Hitachi SR-2004, a real rarity. And, outside the box, it has a very distinctive look which has aged rather well, with the bright digital display and multi-color LEDs contrasting with the legacy analog Power Meters. rated up to 500 watts. 

In 1974 Toshiba released the ST-910 Digital Tuner (also marketed under the "Aurex" brand) which showed off their technical prowess. Much of this technology was incorporated into the SA-7150.


Unique hybrid digital/analog styling, audiophile-oriented circuit design, impressive FM Tuner

Front door is too heavily sprung, vinyl case looks out of place, internal heatsinks

  Setton RS660 Receiver



The 1977 Setton RS-660 certainly qualifies as one of the rarest of the Monster Receivers. And, one of the nicest looking! The Setton line had only three (3) receivers, the RS-220, RS-440 and the top of the line Setton RS-660. The RS-660 retailed for $900.00, making it one of 1977's more expensive receivers, although it was "only" rated at 100 w/ch RMS when introduced. The Setton line was allegedly designed by Allain Caire, an acolyte of Pierre Cardin (although it is mistakenly claimed that the master himself was involved) and was marketed to an "elite" audience. Jack Setton was the French distributor for Pioneer and had decided to come to market with his own brand. In Europe, Setton distributed some really interesting equipment, like the outrageous (for the time) RCX-1000 modular tuner/pre-amp, which shares only its knob design with the RS-660 shown here.

In use, the RS-660's controls are silky smooth and the sound is "rich" and full bodied. So, no complaints there. However, despite the lovely cosmetics, the wood sleeve that it comes with is covered with a really tacky walnut woodgrain vinyl, which get quite sticky with age as it deteriorates. (It also shrinks away from the vent.) In keeplding with its upscale pretenstions, Setton also offered an unusually long warranty period of 5 years.

On a side note: The Setton receivers have always been a source of some controversy since it is well known that they were not manufactured by Setton, but outsourced to a Japanese OEM. However, that issue has now been resolved for the most part, since it appears that the Settons were manufactured in Japan by the same outfit ("Planet Research") that did some Lafayette Radio products, like the LR-9090. However, other people claim it was made by Trio Electronics, parent of Kenwood, or even Pioneer. I actiually acquired an LR-9090 to compare them and can attest that internally, they are about 90% the same, although the power transformer and the pre-amp board are different. So, they are not identical behind the faceplate but clearly made by the same manufacturer and while not identical twins, they are clearly brothers. (See middle comparison photo.) Photos of the internals of the LR-9090 and RS-660 are in the middle. Photos of my LR-9090 are on the right.

All the Settons featured a unique "Security Panel" display, with indicators for "Heat", "Clipping" and "Protection". This included the fairly outrageous BS-5500 Power Amplifier (middle photos), a true "dual mono" design, complete with 2 power switches! The BS-5500 was basically the RS-660's power supply section multiplied by 2. The power supply filter caps in the RS-660 were fairly substantial at 15,000uF x 2. It also had switchable turnover frequencies for the Bass and Treble control and a Hi/Lo phono impedance setting on the rear panel. 

Attempting to add to the exclusive allure, each Setton Receiver was benchmarked at the factory and came with its own individualized spec sheet, signed off by a Tech. When the RS-660 first came on the market, its published spec was 100 w/ch RMS. However, Setton had underrated it, and so it was re-spec'd at 120 w/ch RMS without any change in the circuitry. Even at that, it was still underrated. It's actually good for around 135 w/ch.

Performance aside, a considerable amount of money was invested in the RS-660's "cosmetics". All the buttons are solid metal and the feel of the controls, with their nylon inserts, is almost silky. It is a real pleasure to use. But the vinyl on the case is another story entirely. How could they do this? I couldn't stand it, so I had had the vinyl case on mine redone with matching grain real walnut veneer by "Merrylander" at and I'm pretty sure it's now one of the nicest looking RS-660s in existence.

Sadly, I can't really say I listen to my RS-660 very often because the Setton Receivers have a dreaded Achilles Heel: the power switch is built into the speaker selector and sometimes this can create an electrical arc which destroys the unobtainium selector. Fortunately, the much more common LR-9090 has the identical switch and those are much more common. There are also workarounds, including adding a relay to take the stress off the power switch. I bought my LR-9090 as a source of parts for the Setton.

When critics evaluated the performance of the Setton Receivers, they received fairly glowing reviews. I haven't found any English reviews of the RS-660. But, below is what I found:

A review of the RS-660 from a French audio magazine. (Can someone translate this for me?)
A review of the very similar Lafayette LR-9090 from Stereo Review.
A review of the "little brother" RS-440 from Stereo Review had this to say: "Although style is a very personal consideration, there can be no doubt that the Setton RS-440's front panel is both unconventional and unique - although unmistakably a stereo receiver it will never be confused with any other make. To us, the Setton RS-440 appears to be in impeccable visual taste, with sonic performance to match".


Sound quality, solid feel of the controls, high-end "Pierre Cardin" styling, innovative Security Panel

Tacky vinyl walnut clad case, "a Lafayette with lipstick"


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