What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Teac AS-200

 The Teac Model AS-200 Integrated Amplifier combines a 100 watt (at 4 ohms) total power output with centralized stereo system control. A differential-type integrated amplifier with high-cut and low-cut filters provides a wide dynamic range with natural-sound reproduction. Switched power outlets, complete facilities for stereo system interconnection, and hidden panel controls permit elaborate system setup with centralized control from this stylish amplifier.
Differential-type integrated amplifier:  providing a wide dynamic range, stability, and high-quality performance.
Transistorized amplifier:  with high sensitivity FET input circuit and three-stage direct coupled amplifiers.
Bass and treble controls:  for tone compensation with tone cancel switch.
Preamp center-channel output:  for three-dimensional stereo effects.
Switched and unswitched AC outlets:  for central stereo system power source control.
Large variety of input connectors:  on rear panel for versatile application with RIAA equalization for phono inputs.
Overload protection:  by push-to-reset circuit breakers.
Attractive front panel:  with only essential controls showing; infrequently used controls are hidden behind lower front panel.
Continuous Power Output:  50 W / 50 W at 4 Ω
Power Bandwidth: 30 to 30,000 Hz
Frequency Response:  20 to 80,000 Hz
High Frequency Distortion:  less than 0,5%
IM Distortion:  less than 0,5%
Signal-to-Noise Ratio: 
Phono : less than 65 dB
High Level :  less than 75 dB
Low Tone  : ±10 dB variation at 100 Hz
High Tone : ±10 dB variation at 10,000 Hz
Output :
Pre-amplifier :  1 volt
Tape Recording : 0,2 volt
Center Channel :  1,4 volt
Input:  Tuner; Aux 1 and 2; Phono 1 and 2; Tape Deck 1 and 2
Hidden Panel Controls:
Switches:  Phono,High-cut filter, Low-cut filter; tone and loudness
Selector Switches:  Mode (Reverse, Stereo, Lift, Right and L+R), Speaker (off, Main, remote, and M+R)

Controls:  Bass and Treble, Headphone jack

Teac AE-200

 The Teac model AE-200 incorporates for amplification a "differential circuit" widely used in computers and instrumentation data recorders which are also manufactured at the Computer Products Division of Teac. The result is an extremely wide dynamic range and virtually flat response extending well into the low frequency range.

For ultimate performance of the differential amplifier, a dual power supply system is employed in the Teac model AE-200 (+40 volt, -0 volt, -40 volt). This permits elimination of condensers from the output circuit, to provide automatic compensation of delicate current balance and virtually flat response. This is particularly evident in the low frequency range.
In addition to an ordinary protective circuit, a special thermo-breaker is provided in the Teac AE-200 for complete protection from accidental damage to the amplifier by short circuits in the speaker wiring. Should the breaker be tripped by a short circuit, the cause should be eliminated and the reset buttons depressed to restore operation of the amplifier.
 The Teac model AE-200 gives you 50 clean watts per channel at 8 ohms, and 60 watts per channel at 4 ohms. This is the amplifier's full rated power (continuous sine wave) with a total harmonic distortion of an amazing 0,5% within 0,5 dB. Teac has no need to rely on misleading, inflated so-called "music power" specifications. The virtually undistored power AE-200 delivers is more than enough to drive any speaker system.

Unique concealed Panel Control. Drop the panel lid and Presto. A complete stereo control is revealed with every relinement to please the most discriminating audiophile. Shut the panel and your Model AE-200 is a masterpiece of modern design. Controls in frequent use are always visible and easily accessible. Infrequently used controls are concealed behind the beautiful Eurasian wood panel.

Phase reverse switch. A very convenient  combination switch for phase checking of multichannel speaker systems by reversing polarity or electrically interchanging the left and right speakers. Also, either channel speaker can be individually switched on.

Balans Check. A very unique circuit utilizing the differential amplifier characteristic. When the balance in output of both L and R channels is perfect, they will be canceled and no sound will be heard from the speaker. A signal source applied in parallel to the input is most convenient at making this check.
Rated Power:
50 W + 50 W ±0,5 dB at 0,5% THD 8 Ω load;
60 W + 60 W ±0,5 dB at 0,5% THD 4 Ω load
Harmonic Distortion:  Under 0,1%, 30 watts & 100 mW output
IM Distortion:  Under 0,5% to 40 watts output at 4 Ω load
Power Bandwidth:  20 to 30,000 Hz at 8 Ω load (IHF)
Frequency response:  20 to 80,000 Hz, +0 dB, -1 dB at rated output
Residual System Noise:  Under 0,5 mV
Input Sensitivity/Impedance:  0,7 V/22 k Ω
Signal-to-Noise Ratio (IHF):  100 dB or more
Power Requirements:  115 V AC, 60 Hz
Power Consumption:  150 W max.
Dimensions (W x H x D):  8-1/4" x 5-7/8" x 13"

Weight:  15,4 lbs

Pioneer SE-300

 Pioneer SE-300 High Polymer Stereo Headphones
The operating principle of the E-300 is completely different from that of conventional headphones; a high polymer piezoelectric material is used for the acoustic diaphragms. This has revolutionized the headphones.
Distortion is extremely small even for low level sound, because the effective area of the acoustic plate is increased. This result is greatly improved frequency response compared to conventional headphones.
Large input handling capacity allows you to listen to higher level sounds than was ever before possible.
These headphones have higher efficiency than electrostatic and electret headphones; no special output other than the amplifier's headphone jack is necessary for connection
Operation is very stable in environments of different temperature and humidities.

Speakers Unit:  8,5 µ high-plymer piezoelectric diaphragm
Electrostatic Capacity:  0,08 µF
Frequency Response:  20 to 20,000 Hz
SoundPressure level:  100 dB/3V
Maximum Input Power:  30 V (each channel)
Connection Cord and Plug:  2,5 m vinyl cord with 6,3 mm ø 3-conductor plug

Weight:  280 g ( without connection cord)

Pioneer SE-500

 High-Performance High-Polymer stereo headphones for clear sound reproduction and lightweight comfort.
 Success repeats itself in this, the second generation of Pioneer's original high-polymer stereo headphones. The SE-500 are based on the unusual electrophysical effect called piezoelectrics. As the audio signal reaches the ultra-thin, aluminum-coated high-polymer film drivers, they expand and contract accordingly in an ideal "breathing motion" for impressively natural, quite unmechanical audio response. Tonal characteristics are comparable to those of the electrostatic type headphones, yet you need no matching transformer; the SE-500 plug directly into the headphone jack of your amplifier or receiver. Crystal earphones, ceramic cartridges and other low-class audio uses have been found for the piezoelectric effect in the past, but never with the resonance-free, brilliantly simple high fidelity results obtained in these revolutionary piezo-polymer stereo headphones form Pioneer.
 High-Polymer Film Diaphragm
Wide range reproduction from solid lows to transparent highs is assured, thanks to the unique "breathing motion" of the high-polymer film diaphragms in the SE-500. as the effective diaphragm area is wide, amplitude is minimized to further reduce distortion and clarity response.

Lightest headphones
Lightweight, non-bulky headphones like these greatly enhance your music-listening pleasure. These are among the lightest, easiest to use non-isolating stereo headphones sold.

Maximum Sensitivity and Efficiency
The sensitivity, or efficiency of the Pioneer SE-500 is an important advantage over conventional types, comparing favorably with the electrostatic types yet enabling you to power them directly from your receiver or amplifier without need for a matching transformer.

High Endurance for large Input Signals
The SE-500 feature a high endurance to accept large input signals. This means that dynamic sound reproduction on a  par with that heard in a concert hall, is yours for realistic musical reproduction.

Excellent Stability
Changes in temperature and hunidity do not hamper the stanility of the SE-500. You can depend on constant and uniform performance under all conditions and for long hours of use.

Luxury Design
Slim, smart and stylish. The lightweight, open type (on-the-ear) design and duraable materials of the SE-500 contribute significantly to their appeal.
Diaphragm Unit:  8,5 µ high-plymer element
Static Capacity:  0,08 µF
Frequency Range:  20 to 20,000 Hz
Sensitivity:  100 dB/3V
Maximum Input Power:  30 V 9each channel)
Connection Cord and Plug:  meshwork cable (3 m) with 6,3 mm ø 3-P plug

Weight:  370 g (13 oz) with connection cord

Sanyo DCA 1001

 A dynamic pre-main amplifier with quality features and enough power to drive any high quality component sound system.
Handsomely styled unit with jumbo-size calibrated volume control knob with pre-set clik stop action.
45 watts per channel RMS minimum continuous power with maximum total harmonic distortion of 0,5% at 8 ohms.
Detent bass and treble controls for precision setting.
Tone defeat sitch for instantaneous flat response
Balance  control
Off/A/B + B speaker switching
Low filter and loudness control
Multi-tape recording playback control featuring copy 1-2/play 1/source/play 2/copy 2-1
Phono, Tuber, Aux, Tape 1 and 2 input and outputs
Separate switched and unswitched AC outlets
Amplifier comes complete with audio cables
Handsomely styled all metal cabinet with simulated walnut grain side panels
Power-amp Section
Minimum Continuous Power:  45 watts per channel (20-20,000 Hz, THD 0,5%, 8 Ω)
Frequency response:  15 - 15,000 Hz
Tone Controls:
Bass :  ±12 dB at 50 Hz
Treble :  ±3 dB at 20 kHz
Loudness Control:  +8 dB at 100 Hz ;  +3 dB at 10 kHz
Input Sensitivity/Impedance:
Phono :  2,5 mV/50 k Ω
Tuner :  140 mV/50 k Ω
Aux :  140 mV/50 k Ω
Tape :  130 mV/50 k Ω
Tape rec. Output level:  140 mV
Damping Factor:  40 at 8 Ω, 1 kHz
Semiconductors:  4 IC,  7 Transistors,  22 Diodes
General Section
Power Source:  AC, 100-120/220-240 V, 50/60 Hz
Power Consumption:  88 watts
Dimensions (W x H x D):  15-3/4" x 5-5/32" x 13-3/4")

Weight:  21 lbs 8 oz.

Sanyo FMT 1001K

 FMT 1001K Massive High-styled AM/FM Stereo Component Tuner with Large, Extra-Wide Dial Scale

Perfect mate for home sound system providing high-quality, pure sound FM reception. This unit is a must for any sophisticated component ensemble providing rich, true high fidelity sound for your listening or recording enjoyment. A quick lokk at the features and specifications of this unit assures you of the finest AM broadcast and pure FM stereo reception.

Extra wide tuning dial scale for sensitive tuning
High blend On/Off switching
Heavy duty gyro-balanced flywhell
AM sinal strength and FM center tuning meter
AM/Auto FM Mono/Stereo selector
Left and right output jacks
Stereo indicator light
FM 75 Ω and 300 Ω antenna terminals
AM external antenna terminal and built-in ferrite antenna
FM indoor antenna and audio cables are provided
Deluxe, high-styled metal cabinet
FM Section
Tuning Frequency Range:  88 to 108 MHz
Usuable Sensitivity (IHF):  2,0 µV
IF Rejection:  90 dB
Image Rejection:  60 dB
AM Suppression:  55 dB
Capture Ratio:  1,0 dB
Selectivity (IHF):  60 dB
Signal-to-Noise Ratio:  70 dB
Harmonic Distortion [Mono/Stereo]:  0,5% / 0,2%
Stereo Separation (at 1 kHz):  40 dB
AM Section
Tuning Frequency Range:  535 to 1600 kHz
Sensitivity:  25 µV
Image Rejection:  40 dB
IF rejection:  40 dB
Selectivity:  30 dB
Signal-to-Noise Ratio:  50 dB
Harmonic Distortion:  0,4%
General Section
Output level/Impedance:  500 mV/3 k Ω
Power Source:  100-120/220-240 V, 50/60 Hz
Power Consumption:  9 W
Dimensions (W x H x D):  15-3/4" x 5-5/32" x 14"

Weight:  13 lbs 8 oz

Sherwood S-8800a

 First of a new breed  - from Sherwood.
This is what high performance is all about. A bold and beautiful new FM Stereo receiver bred to leave the others behind. 160 crisp, cleanwatts-power in reserve. Up-front, ultra-now circuitry featuring Field-Effect Transistors and microcircuitry. Front-panel, push-button command of main, remot, or mono extension speakers and loudness contour. Sherwood high-fidelity - where the action is - long on reliability with a three-year warranty.
 Sherwood presents its latest version of the world-famed S-8800 series All-Silicon solid-state receivers. Six push buttons control the choice of main or remote stereo speakers (or both simultaneously), loudness contour, stereo/mono selection, tape monitoring, and high filter.
Unique with this receiver are two front-panel jacks, one to operate stereo headphones and another to playback or record into a tape recorder (or cassette recorder). The tape jack can also be used in conjunction with the S-8800a rear-panel jacks for dubbing from one recorder to another or for simultaneous recording on 2 recorders.
 New features such as these are backed up by the latest engineering advances such as Microcircuitry in IF and Synchro-phase FM limiter/detector circuits (providing -60 dB AnM rejection and 2.0 dB capture ratio). Also featured are Field Effect transistors in RF and Mixer stages (enabling -95 dB cross-modulation rejection).
A power reserve of 160 watts (4 Ω music power) is available to operate 2 sets of stereo speaker outputs and also a mono speaker output on the rear panel. Superlative sound reproduction is provided by the Sherwood S-8800a FM rated at less than 0,15% distortion and stereo amplifier rated at 0,1% at normal listening levels.

All of Sherwood's solid-state receivers, which have long been acclaimed throughout the world for their reliability, now offer a full 3-year warranty on all parts.
Amplifier Section
Power Output:
At 4 Ω : Music power 160 watts total continuous power 50 watts x 2
At 8 Ω : Music power 120 watts total continuous power 40 watts z 2
Harmonic Distortion :
0,35% at 8 Ω rated output
0,10% at 2 watts & 5 watts
Intermodulation Distortion:
0,6% at 8 Ω rated output
0,15% at 2 watts & 5 watts
Speaker Output Impedance (Stereo & Mono):  4 Ω, 8 Ω,   or 16 Ω
Stereo Headphone Output:  high or low impedance
Stereo Recording Output:  500 mV/2 k Ω
Power Bandwidth:  12 - 30,000 Hz at 1% Distortion
Frequency Response:
Phono :  RIAA standard, ±1,5 dB
Aux : 20 - 20,000 Hz, ±1 dB
Damping Factor:  40 : 1 at 8 Ω
Bass : ±15 dB at 40 Hz
Treble : ±15 dB at 15 kHz
High Filter:  -23 dB at 20 kHz;  -3 dB at 5 kHz
Input Sensitivity (for rated output):
Phono :  1,6 mV, variable to 50 mV
Aux :  200 mV
Tape Monitor : 200 mV
Input Capability (for 1% dist.):
Phono :  250 mV
Aux :  2,5 V
Hum and Noise (IHF):
Phono : -65 dB
Aux. :  -80 dB
Vol. Control Min. : -90 dB
Crosstalk:  -40 dB at 1 kHz
Special Features:
Mono speaker output; Transistorized instant overload protection; Tone control flat response ±5 degrees; Front-panel tape dubbing jack.
Tuner Section
Fm Sensitivity (IHF):  1,8 µV (-30 dB noise & dist.)
Signal-to-Noise Ratio:  -70 dB
Capture Ratio:  2,0 dB
Suppression Of AM:  -50 dB
Tuning Range:  87,5 to 108,5 kHz
Distortion:  0,15% at 100% mod.
Crossmodulation Rejection:  -95 dB
Stability:  ±10 kHz (±.01%)
Image rejection:  -80 dB
IF Rejection:  -90 dB
Alternate-Channel Selectivity:  55 dB
Stereo Separation:  40 dB at 1 kHz
Freqquency response:
Mono : 20 - 20,000 Hz, ±1 dB
Stere0 : 20 - 15,000 Hz, ±1 dB
Antenna: 300 Ω balanced, or 75 Ω coax.
Special Features:
FET RF and mixer stage,
Microcircuit IF and Synchrophase Limiter,
Flywheel-assisted vevlet tuning,
Dial scale 7 ¾ inches long, 0,2 MHz calibrations,
Interchannel hush with front-panel level adjust,
Zero-center tuning meter,
Noise-protected automatic FM stereo/mono switching at 8 µV.
Power Requirements:  115 - 125 V, 60 Hz, 30 or 160 watts fused.
AC Outlets: 300 W switched / 300 W unswitched
Dimensions (W x H x D):  16 ¼ x 4 ¼ x 14 inches
Weight:  27 lbs (shipping)
Optional Accessories:
Oiled Walnut Cabinet (W8):  17 x 5 x 14 inches

Walnut-grain Leatherette Case (Type D):  16 ¼ x 4 ¼ x 14 inches

Heathkit AR-1500A

 We've improved upon the Classic receiyer.
The tradition of heathkit stereo receiver superiority began in 1967 with the heathkit AR-15. then in 1971 came the Ar-1500. now, it's the AR-1500A, the world's classic receiver, improved once again. Design advancements include.

Phase lock Loop (PLL) multiplex demodulator with only one simple adjustment, your assurance of maximum separation, droft-free performance and long-term stability. Simplification of the AGC circuit resulting in significant improvements in AM performance. Improved output protection for better drive capability over taday's wider range of speaker impedances.

Now Easier To Build
In redesigning the AR-1500A, special care was given to making the kit even easier to build than before. A separate check-out meter is used to check out each step as assembly progresses. Factory-installed cable connectors are another new kitbuilding aid.
 Still tops in performance.
The precedent-setting performance specifications of the AR-1500 have, of course, been retained. Conservatively rated, the Ar-1500A puts out 180 watts, 90 per channel, into 8 ohms, with both channels driven, with less than 0,25% harmonic distortion. Two computer designed five pole LC filters and the 4-gang, front end combine for an FM selectivity beter than 90 dB with 1,8 µV sensitivity. And here are some things the specs won't show you. There are outputs for two separate speaker systems, two sets of headphones, preamp output, and monitoring of FM with an ascilloscope such as the Heathkit Audio-Scope. Standard inputs - all with individual level controls. Electronically monitord amplifier overload circuitry.
Tuner FM Section
Sensitivity:  1,8 µV
Selectivity:  90 dB
Image rejection:  100 dB
IF Rejection:  100 dB
Capture ratio:  1,5 dB
Harmonic Distortion: 0,5% or less
Intermodulation Distortion:  0,1% or less
Channel Separation:  40 dB or greater at midfrequencies; 35 dB at 50 Hz; 25 dB at 10 kHz; 20 dB at 15 kHz
Tuner AM Section
Sensitivity:  50 µV with external input; 300 µV per meter with radiated input
Selectivity:  20 dB at 10 kHz;60 dB at 20 kHz
Image Rejection:  70 dB at 600 kHz; 50 dB at 1400 kHz
IF Rejection:  70 dB at 1000 kHz
Amplifier Section
Dynamic Power Output per Channel:
Music Power Rating:  90 watts (8 Ω load);  1200 watts (4 Ω load);  50 watts (16 Ω load)
Continuous power Output per Channel:  60  watts ( 8 Ω load);  100 watts (4 Ω load); 40 watts (16 Ω load)
Power Bandwidth (for constant .25% THD):  less than 8 Hz to greater than 30 kHz
Frequency Response (1 watt level):  9 Hz to 80 kHz,  -1 dB
Harmonic Distortion:  less than 0,25% from 20 Hz to 20 kHz at 60 watts output
Intermodulation Distortion:  less than 0,1% with 60 watts output
Damping Factor:  Greater than 60
Channel Separation:  55 dB (Phono)
Output Impedance (each channel):  4 Ω through 16 Ω
Dimensions (W x H x D):  18-1/2" x 5-1/8" x 13-7/8"
Weight (less cabinet):  53 lbs

Technics RS-630

 The art of recording now takes another step forward.
Cassette tape decks have really come into a world of their own, thanks to the many technical breakthroughs accomplished by some very ingenious engineers. The Dolby noise reduction, vastly improved tape heads, peak level check meters, chromium dioxide tape cassettes and stabilized tape transport are just some of the many reasons for the cassette deck's rise into the ranks of top quality high fidelity systems. This should be enough to satisfy even the most professional type of audio fan, but Technics engineers weren't happy. Their constant striving for even better and better systems has produced a real classic in cassette tape decks - the RS-630 where all controls and tape loading are operated from the Front. With the RS-630, you not only have all that's best in the latest cassette deck technology, you have it all there on the front panel, bringing it right into line with your other Hi-Fi components.
 Separate bias and equalization selectors for optimum recording with any type of tape.
The RS-630 can make full use of the quality potential of any kind of cassette tape - be it normal, LH, chrome or the new ferric-plus-chrome types. With its separate bias current and equalization selector switches, optimum conditions can be estabilished for any tape, to give you recordings of even,balanced frequency response, excellent dynamic range and finest signal-to-noise ratio. It's you who chooses the tape - not the machine.

Outstanding peak check meters.
All music contains short sharp signal peaks which are several times more intense than the average signal level. These peaks may well overreach the tape's ability to accommodate them, resulting in distorsion. To avoid this,the deck's recording level may be set to a lower position, but if set too low, tape noise may become noticeable during quieter passages. Accurate adjustment of recording level is then very important, and this is where the unique peak check meters play a major role. These two large, easy to read meters can give both "conventional" level readings (which are more or less averaged readings), and peak check readings where they respond to even the shapest signal peaks.  This will go a long way in making genuinely high quality tape recordings.
 The Dolby noise reduction
The Dolby noise reduction system has greatly improved the quality of cassette tapes by removing much of the background noise. Technics was very quick to adopt the Dolby system as  a standard feature for the discriminating audio fan. The Dolby system removes the hiss-like tape noise, particularly noticeable during the quieter lulls, by boosting high notes duriug recording. In playback, the Dolby circuit reduces the boosted notes back to their previous levels, but at the same time reduces the tape hiss to a much lower, almost inaudible level. It's no wonder that the Dolby system has become a standard feature for the keen audio enthusiasts.

HPF head with extremely long service life.
One of the major drawbacks in any tape recording has been the constant wear and tear on tape heads. But now Technics engineers have also overcome this problem with their extremely long life HPF heads which withstand even the longest wear and tear. They are guaranteed to last at least for 10 years, far beyond the best performance of normal heads.

Output level control
This control is essential if you want to adjust the cassette deck's output to the same level as your tuner and turntable, etc. You will need no further adjustment of your amplifier volume control, and will be free to switch from component to component all at athe same volume.
 Front loading makes cassette decks a full member of the component family
Now you can stack your cassette tape deck righ along, or right on top, pf your other components. Neat and tidy, and space-saving, yet still with the same high quality precision performance as before. Note the flood-lit compartment with its sliding door and easily accessible tape heads for easy cleaning and demagnetization.

Plus a host of other value features.
Auto-stop at end of tape prevents undue strain.
Lockable pause button for quick interruptions of recording or play.
Big, handy play and stop buttons.
Tape transport clearly visible, thanks to illuminated cassette compartment with two mirrors.
Connectors include; mic inputs, line inputs, line outputs, DIN-type Rec/Pb connector, stereo headphones jack.
Track System: 4-track, 2-channel stereo recording and playback
Motor:  1 Electronic speed control motor
1 x HPF head for rec/playback
1 x Ferrite head for erasing
Tape Speed:  4,8 cm/s (1-7/8 ips)
Wow and Flutter:  0,09% (WRMS), ±0,20% (DIN)
Frequency Response:
CrO₂ Tape :  20 - 16,000 Hz (30 - 14,000 Hz DIN)
Normal tape : 20 -14,000 Hz (30 - 13,000 Hz DIN)
Signal-to-Noise ratio:
Dolby NR in :  60 dB (above 5 kHz)
Dolby NR out :  50 dB (signal level 250 nWb/m)
Fast Forward /Rewind Time:  Approx. 90 sec. With C-60 cassette tape.
Inputs Sensitivity/Impedance:
Mic : 0,25 mV/600 Ω -20 k Ω
Line : 60 mV/47 k Ω
Outputs level/Impedance:
Line : 0,42 V/ 50 k Ω over
Headphone : 60 mV/8 Ω
Rec/PB Connection:  5 P DIN type
Power requirements:  90-109/110-125/200-219/220-250 V, 50/60 Hz AC
Power Consumption:  10 W
Dimensions (W x H x D):  410 x 142 x 321 mm (16-1/8" x 5-5/8" x 12-5/8")

Weight:  7 kg (15-3/8 lbs)

Technics RS-M63

 The RS-M63's 3-head configuration lets you do what most other comparably priced decks don't; monitor your recordings while you're recording. And, since our separate HPF record and playback heads are precisely gapped and enclosed in a single housing, you won't get azimuth error. What you will get is an extremely wide frequency response with CrO₂ tape and an incredibly high response with metal tape.
 As good as that sounds, double Dolby will make it sound even better, because there are separate Dolby circuits for recording and playback. So you can monitor your tapes with the full effects of Dolby Noise Reduction. That means a lot when it comes to accurate recordings.
So do the RS-M63's fluorescent (FL) bar graph meters. Especially when it comes to dynamic range. Because with their device attack time of just 5-millionths of a second, they can respond to the most sudden musical transients.
To help you make the most of all this performance, the RS-M63 has a fine bias adjustment, so you can get the most out of all kinds of tape. And you'll spend more time listening to music and less time searching for it, because we include the memory features you need. Like auto-rewind, auto play and rewind auto play.
Track System:  4-track, 2-channel stereo recording and playback
Motor:  Electronically controlled DC motor
Heads:  3-head system
2 x HPF heads for record/playback (combination type)
1 x Sendust/Ferrite double-gap head for erasure
Tape Speed:  4,8 cm/s
Wow and Flutter:  0,05% (WRMS)  ±0,14% (DIN)
Frequency Response:
Metal tape : 20 - 20,000 Hz (30 - 18,000 Hz  DIN)
CrO₂/Fe-Cr tape :  20 -18,000 Hz (30 - 18,000 Hz  DIN)
Normal tape :  20 - 18,000 Hz (30 - 17,000 Hz  DIN)
Signal-to-Noise Ratio [Dolby NR in/Dolby NR out]:  67 dB (above 5 kHz) / 57 dB
Fast Forward/Rewind Time:  approx. 90 sec. with C-60 cassette tape
Inputs Sensitivity/Impedance:
Mic : 0,25 mV/10 k Ω
Line : 60 mV/56 k Ω
Output Level/Impedance:
Line : 650 mV/2,7 k Ω or less (load impedance 22 k Ω over)
Headphone : 100 mV/8 Ω
Rec /Pb DIN Connection:  5 P DIN type
Input Sensitivity/Impedance : 0,25 mV/8,2 k Ω
Output level/Impedance : 650 mV/2,8 k Ω
Bias Frequency:  85 kHz
Power Requirement:  AC, 110/125/220/240 V, 50/60 Hz
Power Consumption:  14 W
Dimensions (W x H x D):  430 x 142x 270 mm

Weight:  6,3 kg

Acoustic Research AR-2x

 The AR-2x are lower cost versions of our basic acoustic suspension design. AR-2x has a 10-inch bass speaker, mounted in an acoustically sealed enclosure filled with glass wool, and in addition , a small, high-dispersion cone speaker. Separate controls on the back of the AR-2x  permit independent adjustment of the level of the midrange / high frequency speakers. The performance standard in the design of the AR-2x was the same as that for the AR-3a; natural reproduction of music without exaggeration or artificiality of sound. But where quality in the case of the AR-3a hes been limited only by the state of the art. And our own engineering skill, here price is also a consideration.
 "Clean, balanced and wide range …  from under 50 cycles to beyond audibility this speaker will reproduce what is fed to it with clarity and with honesty …  its strengths lie in an unusual smoothness and lack of any harshness whatsoever."
American Record Guide

"The  bass line is, as we have come to expect from AR, exemplary; well-defined and clean. The highs are quite open … strong fundamental bass to just below 40 Hz … response upward from here is uniform, smooth and remarkably well dispersed all about the speaker".
High Fidelity
Specifications  AR-2x 
Sensitivity:  91 dB
Response:  42 Hz to 20,000 Hz (± 2 dB)
Recommended Amplifier Power:  20 watts RMS,
Minimum impedance:  8 ohms
Woofer resonance:
Free air  :  26 Hz
In enclosure 56 Hz
Speaker Complement:
Woofer : 10" acoustic suspension
Mid/High-frequency : 2 ½"  cone 
Crossover Frequencies:  1200 Hz
Controls:  high-frequency adjustment
Volume of enclosure:  38.2 litres (1.35 cu ft)
Dimensions:  13 ½" x 24" x 11 ½"
Weight:  15 kg (33 lbs)
Finish:  Glossy or oiled walnut, cherry, oiled teak, mahogany, birch and unfinished pine.

Acoustic Research AR-2ax

 The AR-2ax are lower cost versions of our basic acoustic suspension design. Each has a 10-inch bass speaker, mounted in an acoustically sealed enclosure filled with glass wool, and in addition , a small, high-dispersion cone speaker. In the AR-2ax there is a third speaker, a ¾-inch hemisphere for very high frequencies, the same unit as is used for this purpose in the AR-3a. Separate controls on the back of the AR-2ax permit independent adjustment of the level of the midrange and high frequency speakers.
 The performance standard in the design of the AR-2ax was the same as that for the AR-3a; natural reproduction of music without exaggeration or artificiality of sound. But where quality in the case of the AR-3a hes been limited only by the state of the art.  And our own engineering skill, here price is also a consideration.

"… the low-frequency speaker has exceptionally low bass distortion … the tone burst response of the AR-2ax gave further evidence of its excellent quality … comes remarkably close to matching the AR-3."
HiFi Stereo Review

Specifications  AR-2ax
Sensitivity:  91,5 dB
Response:  42 Hz to 20,000 Hz (± 2 dB)
Recommended Amplifier Power:  20 watts RMS,
Minimum impedance:  8 ohms
Woofer resonance:
Free air  :  26 Hz
In enclosure 56 Hz
Speaker Complement:
Woofer : 10" acoustic suspension
Midrange : 3 ½" cone
Tweeter : ¾" hemispherical dome
Crossover Frequencies:  1400 Hz/5000 Hz
Controls:  Independent midrange and high-frequency adjustments
Volume of enclosure:  38.2 litres (1.35 cu ft)
Dimensions:  13 ½" x 24" x 11 ½"
Weight:  16,6 kg (36,5 lbs)

Finish:  Glossy or oiled walnut, cherry, oiled teak, mahogany, birch and unfinished pine.

SAE 2401

The new SAE "01" Series power amplifiers represent a redirection of amplifier design philosophy in which great emphasis is placed upon reality,  the need for your power amplifier to interact with your speakers and produce the desired result (clean, clear, enjoyable music) regardless of volume level, program material or speaker design. The "01" amplifiers are capable of passing the complex musical signals of your program material into the equally complex load of your speakers with the highest degree of accuracy.
 What makes this different from any other amplifier design? Very simply, the degree to which SAE has pursued this goal.
 Other amplifiers seem to be satisfied with great "specs". They often forget that laboratory test situations - the standard distortion measurements we've heard so much about - do not reproduce the reality of your music, played through your speakers, in your living room.
 Those THD and IM measurements so often used to judge an amplifier's performance are obtained by feeding a simple, predictable sine wave to an amplifier and observing how accurately that amplifier passes it to a static 8 Ω load resistor. Since the sound waves of real music are neither simple non predictable, and a real loudspeaker is a dynamic load which only occasionally offers exactly 8 ohms of resistance.
SAE saw the need to go beyond conventional test procedures. We fed music - not sine waves - into loudspeakers, and our findings led us to the creation of the "01" Concept, and a line of power amplifiers which embodies all of the following features:
High Current Capability
When we replaced the standard 8 Ω resistor with an active loudspeaker, we saw a complex ever-changing load which often appears to the amplifiers as a load even lower than 2 ohms. When this happens your amplifier needs to deliver more current to your loudspeaker than would ever be necessary with an 8 Ω load. All of the SAE "01" amplifiers have a vast amount of reserve power. In fact, each is capable of over ten times the amount required to breeze through conventional performance tests.

Balanced Circuit Design
Your power amplifier must be prepared to deal with a bombardment of highly complex, constantly fluctuating sound waves,  waves that are asymmetric (where the positive half of the wave is often quite different from the negative half). SAE's solution to this challenge is separate complementary amplifiers. Each channel  of an "01" power amplifier actually contains two amplifiers - one for the positive side of teh program and one for the negative side. From input to output, a totally independent amplifier designed to deal with that particular part of the waveform. Thase mirror image amplifiers combine to provide a signal so free of distortion there is no need for feedback correction.

Natural Damping
Damping is the amplifier's ability to provide controlled "breaking" of the speaker at the end of a waveform. Conventional amplifier tests actually evaluate the sum of two very different types of damping. One, which we call "artificial" damping, is generated in the negative feedback loop of the amplifier ,and therefore, is both frequency and level dependent . The second type. "natural" damping, is the actual internal resistance of  of the amplifier. It is not affected by the frequency or level of the signal. As the music becomes more complex, and particularly when high frequencies are involved, this natural damping is what really controls the loudspeaker. SAE found this damping factor to be determined by the number of output devices, the size and quality of the power supply, and the actual wiring of the amplifier. Our "01" Series is designed to give a very high natural damping ability … to provide precise control of your loudspeakers regardless of the music.

As other components in your high fidelity system become more and more sophisticated, the power amplifier's job of controlling both signal and speaker becomes increasingly more challenging. The SAE "01" Series is the beginning of a new era of amplifiers designed to handle the complex demands of history's most advanced audio systems. Listen to what it can do for yours.

2401 Technical Features
Dual Power Supply - with toroid power transformer provides massive energy reserve for bass transients and reduced channel interaction for improved stereo imaging.
Toroid Power Transformer - provides a significantly reduced hum field for improved signal to noise ratio.
Gold-Plated Internal Connectors - and glass epoxy circuit boards; provide higher sonic performance and long term reliability.
Turbo-Flow heatsinks - designed by SAE to break-up the laminar air flow surrounding conventional heatskins and thus significantly improve amplifier's heat dissipation under heavy or continuous use.
LED Power Display - provides fast, accurate indication of 2401 output in both dB and watts at 8 ohms.
Wideband and Hi-Pass (low filter) Inputs - the Hi-pass input provides signal attenuation below 20 Hz for systems having acoustic feedback or rumble problems. Wide band input extends from 2 Hz to 160 kHz.
Rackmounting - are standard rack heights and provide EIA standard spacing for rack mounting holes. Proper rear support should be provided ,should extended transportation in a rack be anticipated.
Transission Line - this amplifier may be connected directly to 25 volt transmission systems and through appropriate transformers to 70 volt system.
Forced Air Cooling - for special application where high ambient temperatures and /or very low impedance loads are encountered, we offer the 4301 Rack Mount Fan System.
2401 Specifications
Minimum Continuous RMS Power Per Channel (both channels driven 20 - 20,000 Hz at rated Distortion):
250 watts at 8 ohms
375 watts at 4 ohms
Total harmonic Distortion (from 250 mW to full rated power/at 1 watt):  less than 0,025%/0,02%
Intermodulation Distortion (from 250 mW to full rated  power):  less than 0,025%
Clipping head Room:  0,5 dB
Damping Factor:  60
Freuency Response:
Rated Power :  20 Hz to 20 kHz  +0, -0,5 dB
1 Watt [Normal/Hi-Pass]:  2 Hz - 160 kHz / 20 Hz - 160 kHz   +0,25, -3 dB
Signal-to-Noise Ratio:
Rated Power (unweighted):  110 dB
Rated Power (IHF-a):  125 dB
1 Watt (IHF-A):  100 dB
Crosstalk (100 Hz to 10 kHz):  greater than 70 dB
Input Sensitivity:
Rated Output :  2,24
1 Watt : 0,14
Current Slew Rate:  20 amps/microsecond
Slew factor:  3
Protection:  Relay, Thermal, Low Impedance
Dimensions (W x H x D):  483 x 178 x 318 mm (19" x 7" x 12,5")

Weight:  21,3 kg (47 lbs)