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





Luxman MS-11

 Luxman Loudspeaker System. Two-way bookshelf type, featureing Multi-Vent system.
Light and rigid aramid fibre woofer offers superb transient response and excellent resolution. Polyester-cloth dome type tweeter ensures crystal highs with wide dispersion Multi-Vent Controlled System for dynamic bass reproduction.
 The Multi-Vent scheme is used as the design of this enclosure.
On the basis of the enclosure of closed mold, this opened two or more small holes in the front surface of a box, is a scheme which reduces the air pressure in a box in the suitable status, and has acquired the strength of a sealing scheme and a bass-reflex scheme. By this, it was lost that it is under many pressures to a cone, and the outstanding property has been acquired.
High damped hard particle board is adopted as the quality of the material, inside, the sound-absorption effect is high, the super seal which can suppress an oscillation of particle board effectively is stuck, and the unnecessary radiation from an enclosure is reduced. 
Specifications
Type:  2-way Multi-Vent Controlled System
Drive Unit:
Bass-Mid Range :  20 cm (8") Aramid Fibre Cone
Treble Range :  25 mm (1") Polyester Matrix Dome
Frequency Response:  50 Hz - 20 kHz
Maximum Input:  80 W
Output Level:  90 dB/W/m
Crossover Frequency:  3 kHz
Impedance:  6 Ω
Dimensions (W x H x D):  250 x 540 x 255mm (10" x 21,6" x 10,2")
Weight:  8,6 kg (18,9 lbs)

Heathkit AA-151

 Easy-to-Built. Easy-to-Buy. That 's the AA-151. For ease of assembly, there are simple. Step by step instructions and large "exploded" diagrams.  For performance, there's the Heath patented Ultra-Linear output circuit for unusually fine specifications. And for good old-fashioned value, there's the easy-to-afford price.
 Features
28 hi-fi rated watts (14 per channel)
Stereo or Mono operation
4 stereo inputs
6 versatile controls
Matches the AJ-11 Tuner perfectly
 Versatile and Flexible Performance.
The AA-151 accepts any stereo or mono program source, offers complete finger-tip controls, and delivers 32 watts IHF music power. The 4-input selector switch lets you choose mag. phono, crystal phono, tuner, or auxiliary inputs.  The 6-position mode switch allows choice of both or either stereo signal. In addition, there are ganged volume controls, ganged tone controls for bass and treble; speaker phase reversal switch, filament balance controls, and accessory AC outlets.

Moder Styling Matches AJ-12 and AJ-32.
The steel cabinet is clad in tan vinyl with charcoal gray front panel and polished trim, matches the AJ-12 and AJ-32.
Specifications AA-151
Channels:  Two
Power Output: 14 W + 14 W per channel
Heath Hi-Fi Rating:  16 W + 16 W per channel
IHFM Music Power Output: 0,7% THD, 1 kHz
Power Response:  20 Hz to 20 kHz (=-1 dB) at 14 watts output per channel
Harmonic Distortion:  less than 2% (30 Hz to 15 kHz at 14 watts per channel)
Intermodulation Distortion:  less than 2% at 14 watts output per channel using 60 Hz and 6 kHz signal mixed 4:1
Hum and Noise: 
Mag. Phono input :  55 dB below 14 watts
Tuner , Crystal Phono :  65 dB below 14 watts
Channel Separation:  better than 45 dB
Input Sensitivity for 14 watt output each channel (tone controls in Flat position):
Mag. Phono :  0,004 V at 1 kHz
Crystal Phono :  0,2 V
Tuner, Aux :  0,2 V
Outputs Impedance:  4, 8 and 16 Ω
Damping Fcator:  10:1
Controls:  Dual clutched volume, ganged bass and treble, 4-position source selector, 6-position mode selector, speaker phasing switch
Tube Complement:  2 - 6EU7; 2 - 6AU6; 2 - 6AN8; 4 - EL84/6BQ5; 1 - GZ34/5AR4
Power Requirements: 117 volts, 50/60 Hz 130 watts
Export Model:  available for 115 - 230 V AC, 50/60 hz
Power Outlets:  2 AC receptacles, 1 switched, 1 unswitched
Dimensions (W x H x D):  15¾" x 5¼" x 11"
Weight Kit:  29 lbs


Heathkit AJ-32

 Enjoy Complete Listening With This Top-Value Heathkit AM/FM/FM Stereo Tuner in One Compact Unit at Low Cost.
Just a flick of a switch and you're up-to-the-minute with the latest news, sports, and music of Am; or the relaxing, quiet beauty of FM or FM Streo.
Added Performance at Traditional Heathkit Savings.
In addition to the features listed opposite, enjoy the "added performance" of complete controls; the AM fidelity switch that selects desired bandwidth for maximum selectivity or fidelity; level controls that adjust to suit your amplifier; built-in AM and FM antennas plus outside terminals; and effortless flywheel tuning.
 Features:
Bulit-in multiplex converter
FM Stereo Indicator Light
Variable AFC for drift-free reception
2 bar-type "Eye" tuning indicators
Stereo Phase Control for minimum distortion, maximum separation
Filtered stereo tape recorder outputs
 Matches The AA-151 In Stiling, Performance.
Handsomely housed in a sturdy steel cabinet clad in attractive tan vinyl with a charcoal gray front panel and polished trim, matches the AA-151.

Easy Assembly
The tuning unit is preassembled, prealigned fro quick, simple construction.
Specifications
AM Section
Tuning Range:  550 - 1600 kHz
Intermediate Frequency:  455 kHz
Usable Sensitivity (Normal position): 
1400 kHz - 10 microvolts (20 dB of quieting);
1000 kHz - 15 microvolts (20 dB of quieting);
600 kHz - 400 microvolts (20 dB of quieting)
IF Bandwidth:
Normal :  6 dB - 7 kHz
Maximum :  6 dB - 12 kHz
AM Antenna:  Built-in rod antenna with provisions for external  antenna and ground
Output Voltage (750 microvolts -30% mod.):  1 Volt
Image Rejection: 
1400 kHz - 40 dB
1000 Hz - 50 dB
600 kHz - 60 dB
Harmonic Distortion(750 microvolts - 95% Mod.):  less than 1%
Hum and Noise (5000 microvolts, 30% Mod.):  30 dB
IF Rejection:  1400 kHz - 30 dB; 600 kHz - 50 dB
FM Section
Tuning Range:  88 MHz - 108 MHz
Intermediate Frequency:  10,7 MHz
Antenna:  Balanced input for external 300 Ω antenna. Internal line anytenna
Output Voltage (30 microvolts -30% Mod.):  1 Volt
Image Ratio (30 microvolts - 30% Mod. ,98 MHz):  -45 dB
Harmonic Distortion (25 microvolts - 100% Mod. , 98 MHz):  less than 1%
IF Rejection (98 MHz):  -65 dB
FM Audio Response (20 - 20,000 Hz):  ±1 dB
AFC Correction Factor (Full AFC):  100 kHz per volt
AM Suppression:  -27 dB
Hun and Noise (25 microvolt, 30% Mod.):  -48 dB
Quieting Sensitivity:  20 dB - 2 ½ microvolts;
30 dB - 3 ½ microvolts;
48 dB - 30 microvolts (max. Quieting)
FM Stereo Converter Section
Audio Frequency Response:  50 - 15,000 Hz  ±2 dB
Subcarrier Bandpass:  23,000 to 50,000 Hz ±3 dB
Channel Separation;  30 dB or more at 1 kHz; 25 dB or more at 10 kHz
Hum and Noise:  -55 dB relative to 1 volt output
Output Impedance (cathode Follower):  Variable to 4000 Ω, each channel
Outputs:  left and Right channel
Power Requirements: 117 volts, 50/60 Hz 130 watts
Export Model:  available for 115 - 230 V AC, 50/60 Hz
Dimensions (W x H x D):  15¾" x 5¼" x 11"
Weight Kit:  23 lbs

Sony STR-6045

 FM Stereo and FM-AM Receiver
Knowing that a low cost stereo receiver need not and should not sacrifice flexibilty or performance, Sony engineers have created a receiver that is pleasing to the discriminating ear and the budget pocket-book. The 6045's power handling capacity may seam modest compared with Sony's higher  priced receivers, but its 75 watts are more than enough to drive two pairs of loudspeakers to conceret half sonic levels. The FM and AM tuber sections of this remarkable receiver employ the same innovative solid state techniques that characterize  all Sony components. Offering more dollar-for-dollar value than do other receivers priced considerably higher, the Sony STR-6045 is the ideal focal point around which to build a moderate cost music system.
Specifications
Tuning Range:
FM :  88 - 108 MHz
AM :  530 - 1605 kHz
Power Output:
18 watts per channel into 8 (stereo)
2 x 25 watts  into 8 Ω , 1 kHz RMS
Frequency response:  10 Hz to 50 kHz
Total Harmonic Distortion:  0,5%
IM Distortion:  0,5 at rated power
Input Sensitivity:
Phono :  2.5 mV (MM),
Line :  250 mV (DIN)
Signal-to-Noise Ratio:  
Phono :  60 dB (MM),
DIN : 80 dB
Line :  64 dB
Output:  250 mV (line)
Damping Factor:  25
Speaker Load Impedance:  4 to 16
Semiconductors: 1 x FET, 43 x Transistors, 32 x Diodes
Dimensions (W x Hx D):  400 x 145 x 310 mm
Weight:  8.3kg

Year: 1971

Infinity Reference Studio Monitor

 The Reference Standard comes into the studio.
Where uncompromising accuracy, high efficiency, and heavy power-handling ability are all required - there Infinity's rugged Reference Studio Monitor belongs.
This speaker is efficient enough to deliver thunderrous volume on as little as 35 watts - and able to handle power in excess of 250 watts.
Other monitor speakers certainly have efficiency and power-handling capability. But we believe none also has the reference Studio Monitor's sweetnes in the upper register, oppen detail in the midrange, and definition in the mid and low bass.
Not the optional matching pedestal, may also be  used with the Reference Standard 1,5 ; Reference Studio Monitor ,RSb, RSA or Rseto raise the speaker to the proper height and angle for optimum sound dispersion.
Specifications
Frequency Response:  43 to 32,000 Hz ±3db
Suggested Power Amplifiers:  35 to 250 watts per channel RMS
Drivers (each channel): 
One 12-inch (30 cm) RS woofer with polypropylene cone.
One 5-inch (12 cm) midrange driver with polypropylene cone.
One EMIT tweeter, rotatable.
Crossover Frequencies:  500 Hz and 5,000 Hz
Dimensions (H x W x D):  670 x 380 x 250 mm (26½" x 15" x 10")
Finish:  Oak veneer over high-density particle board.


Technics ST-7300

 FM/AM Stereo Tuner
There are many high fidelity enthusiasts who seek the quality and control features of a separate tuner, but are put off by the prohibitive prices of "separates". For them, the ST-7300 is the perfect answer. It yields a flat frequency response curve from 20 Hz to 15 kHz, with a low 0,4% total harmonic distortion in stereo, excellent sensitivity and selectivity figures, and a 75 dB signal-to-noise ratio. The ST-7300 demonstarates the high degree of performance that can be enjoyed at a very reasonable cost.
 Test Signal Generator for Perfect FM Recording Level Settings
Accurate level adjustments are critical in FM taping. The St-7300 eliminates the guess work with a built-in test signal generator whose output corresponds to 50% of FM signal modulation. Simply switch on the 440 Hz pure sine wave generator and set the tape recording level.

Direct Antenna Connections
The antenna terminals are connected directly to the circuit board of the front end, without intervening wires. The results are an extremely good sensitivity, and excellent spurious and image rejection.

3-Ganged Capacitor FM Front End
The high S/N ratio and sensitivity of the ST-7300 are due in large measure to the FET and 3-ganged capacitor used in the first stage of the front end.
 Flat frequency Response Over  A Wide Spectrum, 20 Hz - 15 kHz (+0,2 dB, -1,0 dB)
The remarkably flat frequency response curve over a broad range of frequencies is made possible by use of Chebyshev-characteristic low pass filters. These filters also attenuate the 19 kHz pilot signal to a level at which it will not interfere with the audio signal.

Flat Group Delay Filters in IF Stage
Three 2-element flat group delay ceramic filters in IF stage contribute to the tuner's excellent sound fidelity as evidenced by a total harmonic distortion of 0,4% (stereo), and S/N of 75 dB. Five differential amplifiers give high gain and an impressive selectivity rating of 75 dB (IHF).

Two Tuning Meters
The zero-center meter indicates exact center of channel tuning on FM. The signal strength meter works for both AM and FM. When used together, these two meters make FM tuning a simple matter. Quadrature demodulation by an integrated circuit assures meter linearity right up to the 60 dB (1000 µV) input level.
 PLL  FM  MPX  Decoder
A phase locked loop provides the 38 kHz time switching signal by which the two channels of FM MPX broadcasts are decoded. The phase comparator and feedback techniques employed interlock both frequency and phase of input and output signals to provide clearly defined channel separation despite temperature and humidity changes.

Sensitivity 1.0 µV at S/N 20 dB (75 ohms)
The ST-7300 offers a truly amazing sensitivity; full 1.0 µV at ±40 kHz deviation. Even more important, 46 dB quieting level can be reached with a signal strength of 19 µV (75 Ω) in stereo.
When using an outdoor antenna with the ST-7300 a coaxial cable (75 Ω impedance) is recommended.

Specifications
FM Tuner Section
Frequency Range:  88 - 108 MHz
Sensitivity (±40 kHz deviation)
S/N 30 dB :  2,0 µV (300 Ω), 1,4 µV (75 Ω)
S/N 26 dB :  1,8 µV (300 Ω), 1,2 µV (75 Ω)
S/N 20 dB :  1,5 µV (300 Ω), 1,0 µV (75 Ω)
IHF Usable Sensitivity :  2,0 µV
S/N 46 dB quieting Sensitivity:  19 µV (75 Ω, stereo)
Total Harmonic Distortion:
Mono : 
0,2% at 100 Hz,
0,2% at 1 kHz
0,5% at 100 Hz
Stereo :
0,4% at 100 Hz,
0,4% at 1 kHz,
0,5% at 6 kHz
Signal-to Noise (±40 kHz Deviation)
Mono :  69 dB (75 dB,IHF)
Stereo :  65 dB ,( 70 dB IHF)
Frequency Response:  20 Hz - 15 kHz (+0,2 dB, -1,0 dB)
Alternate Channel Selectivity:  75 dB
Capture Ratio:  1 dB
Image Rejection at 98 MHz:  55 dB
IF Rejection at 98 MHz:  82 dB
Spurious Response Rejection at 98 MHz:  80 dB
AM Suppression:  55 dB
Stereo Separation:  45 dB (1 kHz);  35 dB (10 kHz)
Leak Carrier:  -60 dB (19 kHz, 38  kHz)
Channel Balance (250 Hz - 6300 Hz ) ±1,5 dB
Limiting Point:  1,2 µV
Bandwith:
iF Amplifier :  200 Hz
FM Demodulator:  820 kHz
Antenna Terminals:  300 Ω, 75 Ω
AM Tuner Section
Frequency Range:  525 - 1605 kHz
Sensitivity 30 µV, 260 µV / metr
Selectivity:  20 dB
Image Rejection at 1000 Hz:  45 dB
IF Rejection at 1000 kHz: 40 dB
Output Voltage and Impedance:  0,5V / 4,7 k Ω
Power consumption:  11 W
Power Supply:  50/60 Hz; 110/120/220/240
Dimensions (W x H x D):  410 x 139 x 317 mm (16-5/32" x 5-15/32" x 12-15/32")
Weight: 5,1 kg (11,2 lbs)


Pioneer SA-6200

 SA-6200 - Pioneer's medium-powered,versatile stereo integrated amplifier.
Equalizer amplifier section with extra-wide dynamic range signal acceptability
Extended frequency response and wide power bandwith with low distortion
Complementary SEPP circuit design employing differential amplifier at the first stage.
It handles up to 2 pairs of speaker systems, 2 turntables, 2 tape decks, as well as 2 auxiliary sound sources and microphone.
Pre-and power amp sections may be separated and used independently
Specifications
Continuous Power (both channel driven at 1 kHz): 
22 W + 22 W at 4 Ω
18 W + 18 W at 8 Ω
Power Output (in 20-20,000 Hz both channel driven):
15 W + 15 W at 4 Ω
15 W + 15 W at 8 Ω
Total Harmonic Distortion (at rated output power):  less than 0,5%
Intermodulation Distortion (At rated output power):  less than 0,5%
Power Bandwidth (both channel driven IHF):  10 Hz - 70 kHz (HD 0,5%)
Frequency Response:  15 Hz - 80 kHz (+0 dB, -1 dB)
Damping Factor (1 kHz, 8 Ω):  better than 30
Hum and Noise:  better than 90 dB
Residual Haum and Noise (8 Ω pre-and power amp):  less than 1 mV (0,13 µW)
Input Sensitivity/Impedance:
Phono Mag :  2,5 mV/50 k Ω
Microphone :  7,5 mV/ 50 k Ω
Tape Monitor:  150 mV / 100 k Ω
Aux :  1150 mV/100 k Ω
Tuner :  150 mV/100 k Ω
Bass Control:  ±10,5 dB at 100 Hz
Treble Control:  ±10,5 dB at 10 kHz
High Filter:  4 kHz (6 dB/oct)
Loudness Contour (-40 dB position):  =10 dB at 100 Hz ; +6 dB at 10 kHz
Power Consumption:  15 W max
Dimensions (W x H x D):  415 x 132 x 328
Weight:  9,4 kg

Pioneer TX-6200

 TX-6200 - Pioneer's easy-to-operate high quality tuner. A compact, sensitive, practically-priced tuner.
Low-noise junction FET in FM front end.
Exclusive FM IC with 5-stage limiter.
MPX circuit with high-performance IC for wide separation.
Large signal meter and wide linear FM dial scale for easy tuning.
MPX noise filter.
Specifications
FM Section
Sensitivity (DIN, S/N 26 dB, 40 kHz dev):  1,3 µV
Sensitivity (IHF):  1,9 µV
Capture Ratio (IHF):  1,5 dB
Selectivity (IHF):  60 dB
S/N ratio (IHF):  70 dB
Image Rejection:  better than 60 dB
IF Rejection:  better than 90 dB
Spurious Rejection:  better than 75 dB
AM Suppression:  50 dB
THD Stereo:  less than0,4%
Frequency Response:  20 Hz - 15 kHz (+0,2 dB, -2 dB)
Stereo Separation:  better than 40 dB (1 kHz)
Subcarrier Suppression:  60 dB
MW Section
Sensitivity (IHF):  15 µV
Selectivity:  35 dB
S/N Ratio:  50 dB
Image Rejection:  better than 40 dB
IF Rejection:  better than 50 dB
Audio Section
Output Level/Impedance:
Fixed :  570 mV/2,7 k Ω
Variable :  60 mV - 1,8 V/ 2,5 Ω
Power Consumption:  12 Watts
Dimensions (W x H x D):  415 x 132 x 340 mm
Weight:  7 kg

Teac AS-100

 Teac presents ; AS-100 Stereo Integrated Amplifier - The new elegant line, matched stereo components.

Designed to match both in appearance and performance characyeristics, the high quality A-1230/A01250 series tape decks. The crisp professional styling, striking black matte finish and brushed stainless steel panels, allow you to assemble a complete matching home audio center.
The impressive performance characteristics of these units coupled with their moderate cost now make available to everyone, the famous Teac tonal quality, superb sound reproduction, and tasteful styling.

Direct Coupled Differential Amplifiers
The AS-100 employs the same design circuitry as the widely known and reliable AS-200S and AE-200 amplifiers. Originally designed for computer and instrumentation data recorders, it provides a flat frequency response far beyond the range of audibility. Extremely low distortion high S/N ratio, and virtually non existent residual noise combine to produce the famous Teac total sound quality.

Electronic Protective Circuit
Instantaneous acting electronic protective circuitry protects output stages from open or short circuit speaker conditions. The use of heat resistant all silicon transitors provides the highest reliability for lengthy trouble free operating life.

2 dB Stepped Tone Controls
Precision 2 dB stepped tone control (NF type) are employed to eliminate any tonal imbalance between channels and to permit audio contours to match your room acoustics.

NPN-PNP-NPN 3 Stage Direct Coupled Phonoamplifier
Selected low noise silicon transistors and unique direct coupled circuitry combine to produce unparalleled sound quality.

New Low Noise Integrated Circuits (ICs)
The control amplifier section incorporates new low noise integrated circuits for maximum gain, widest dynamic range, and minimum harmonic and intermodulation distortion.
 Versatility
Physically integrated but electrically independent preamplifier/power amplifier sections allow the preamplifier or power amplifier sections to be used separately, as in a divided frequency multi channel or quadriphonic  system. Convenient rear panel switch provides maximum versatility for connections to external or auxiliary equipment.

Convenient Front Panel Tape Deck Inputs
Designed fro tape recorder use, the AS-100has front panel tape deck jacks to allow convenient connections to a second tape deck for dubbing purposes. Eliminates the necessity of disturbing rear panel connections when copying tapes.

Total Flexibility-multiple Inputs
The AS-100 is provided with sufficient rear panel connections for almost any audio configuration. Rotary switched inputs provide for turntables 1 and 2, tuner, and auxiliary inputs 1 and 2. Front panel jacks and tape monitor switch make taping from records or other sources remarkably simple and easy. The turntable 1 and 2 selector allows taping of records without delay while changing records as well as allowing "A-B" comparison checks of cartridges.

Protective Muting Circuit
The AS-100 employs a time delay protective muting circuit to protect your speakers from turn on shock. No current flows in the output circuit until the unit has stabilized after turn on. (1-2 seconds after power is applied)

Dual Speaker Connections - Monitoring jack
The AS-100 has rear panel connections and front panel switch to allow simultaneous connection of 2 pairs of speakers. Internal circuitry automatically compensates for changing impedance loads when one system is turned off or disconected.
A front panel monitor jack permits private listening with both speaker system disabled. Any standard stereo headphones of 8 Ω impedance may be used.
Specifications
MODEL AS-100
Type:  All silicon transistor integrated amplifier
Semiconductors:  26 Silicon Transistors, 2 ICs, 2 Thyristors, 9 Diodes
Circuits:  Differential quasi-complementary SEPP
Power Amp Section
Rated Power: 
Both channel operate THD 0,2%, 8 Ω load : 60 W
Each channel operate THD 0,2%, 8 Ω load :  40 W / 40 W
Harmonic Distortion:  below 0,2% rated power (below 0,1% at 0,! W)
IM Distortion:  below 0,2% rated power
Power Bandwidth:  10 - 40,000 Hz  -3 dB
Frequency Response:  5 - 200,000 Hz  +0 _2 dB
Signal-to-Noise Ratio: better than 9- dB
Residual System Noise:  below 0,3 mV
Input Sensitivity/Impedance:  1V for rated power/50 k Ω
Output Load Impedance:  4 - 16 Ω
Preamplifier Section
Inputs:
Phono 1, 2 :  2 mV/50 k Ω
Tuner : 150 mV/ 50 k Ω
Aux 1, 2 :  150 mV/ 50 k Ω
Tape deck play :  150 mV/60 k Ω
Outputs:
Output Voltage :  1 V at rated input
Record Out :  150 mV at rated input
Frequency Response:  10 - 50,000 Hz ±1 dB
Signal-to-Noise Ratio: 
Phono :  70 dB
Aux :  80 dB
Tone Control:
100 Hz ±10 dB
10,000 Hz ±10 dB
Loudness Control:  50 Hz : +7 dB;  10,000 Hz :  +4 dB
Low Cut Filter :  100 Hz, 6 dB/oct
High Cut Filter:  8,000 Hz, 6 dB/oct
Power Requirements:  100/117/220/240 V C 50/60 Hz
Power Consumptions:  15 W at rted power
AC Outlet:  200 W (switched); 200 W (unswitched)
Dimensions (W x H x D):  410 x 141 x 328 mm (16-1/8" x 5-9/16" x 12-15/16")
Weight:  10 kg (22 lbs) net

Optional Eurasian teak Decorator Panels  - AGC-30
Both the AS-100 and the AT-100 may be fitted with Eurasian hand rubbed teakwood decorator panels. Available as an optional accessory.

Teac AT-100

 TEAC AT-100
New Multiplex Channel Separation Circuitry
New low level multiplex sensitivity provides clean clear stereo operation with only a 10 µV input. The all new multiplex amplifier provides complete channel separation (40 dB at 1 kHz, 100% modulation) even where stations are closely located in frequency and physical proximity to each other.

Sharply Selective-Stable IF circuitry
The FM IF stages of the AT-100 incorporate 6 element ceramic filters for precise exact bandpass shaping. Sharply selective, unaffected by humidity or aging, they provide many years of trouble free operation.

Noise Free FM Receprion
A total of 10 limiting stages are employed in the AT-100 (4 diode limiter stages,  6 transistor limiter stages) to provide  complete freedom from pulse noise reception from auto ignition systems, electrical appliances and atmospheric disturbances.

Advanced Solid State Front End
A dual gate MOS type field effect transistor and a junction type FET are used in the FM RF section to provide maximum gain and sensitivity, high selectivity and the maximum in interference rejection.

Precision Tuning System
The AT-100 tuner employs a 4 gang, linear graduation tuning condenser coupled to a weighted tuning system. The dial features a linear tuning display across the entire tuning band. Independent signal strength and channel center tuning meters make precision tuning remarkably simple.

Interstation Noise Muting
An extremely sensitive muting circuit completely eliminates interstation (white) noise when tuning between stations. Switch controlled from the front panel, the muting circuit can be disabled for tuning extremely weak (fringe area) stations.

Dual Output Facility
The AT-100 is provided with both fixed and variable output level jakc thus is compatible with any currently available amplifying system.

Remarkable Performance Specifications - Moderate Cost.
The overall sensitivity and selectivity of this superb tuner provide clear distortion free FM stereo reception even if fringe areas at a surprisingly moderate cost.

Regulated Stable Power Supply
A completely solid state, closely regulated power supply contributes to the stability of operation of the At-100. prevents station drift even in areas where line voltage is not constant.
Specifications
MODEL AT-100
Type:  All transitor FM stereo tuner
Semiconductors:  25 Transistors, 29 Diodes
Circuits:  Superheterodyne
FM Section
Receiving Frequency:  88 - 108 MHz
Intermediate Frequency:  10,7 MHz
Sensitivity:  2,0 µV (IHF)
Capture Ratio:  below 1,5 dB
Image Rejection:  better than 90 dB (98 MHz)
IF Rejection:  better than 90 dB (98 MHz)
Selectivity:  better than 65 dB (±400 kHz)
Signal-to-Noise Ratio:  better than 70 dB (1 mV input, 100% modulation)
Harmonic Distortion:  below 0,5% (1 kHz, 100% modulation)
FM Stereo Separation: 
Better than 40 dB ( 1 kHz, 100% modulation)
Better than 30 dB (100 - 10,000 Hz , 100% modulation)
Frequency Response:  50 - 15,000 Hz ±1 dB
AM Suppression:  better than 50 dB (FM 400 Hz, 100%; AM 1 kHz, 30%)
19 and 38 k Hz Suppressions:  better than 55 dB
Frequency Drift:  25 kHz
Input Indicator:  by tuner input meter
Tuning Indicator:  by tuning meter
Stereo Indicator:  by stero indicator lamp
Automatic Stereo Switch Level:  10 µV
Muting Switch level:  10 µV
Rated Outputs:
Fixed :  1 V (400 Hz , 100% modulation)
Variable :  1 V (400 Hz, 100% modulation)
Output Impedance:  30,000 Ω
Power requirements:  100/117/220/240 V AC 50/60 Hz
Power Consumption:  16 W
AC Outlet:  300 W Unswitched
Dimensions (W x H x D):  410 x 141 x 328 mm (16-1/8" x 5-9/16" x 12-15/16")
Weight:  7,5 kg (16,5 lbs) net

Optional Eurasian teak Decorator Panels  - AGC-30
Both the AS-100 and the AT-100 may be fitted with Eurasian hand rubbed teakwood decorator panels. Available as an optional accessory.

Rotel RA-611

 Here is RA-611, a truly sophiscated pre-main amplifier created for excellent stereo listening, at surprisingly reasonable cost. Not only it hasinherited all the outstanding performances of the predecessor RA-610,but also it is incorporated with much more improved electronics.  And convenient features. The amplifier then offers greter versatility and simplicity of usage not found in those at comparable price.
Think of its modest power of 30 W x 2 continuous RMS both channels driven. The distortion that is way below 0,1% at normal listening. The phono overload that is amazing at 100 mV. And the power bandwidth that is really wide from 5 to 50,000 Hz. Look at the controlsand the connections; you can play two tape recorders and dub each other with a flick of switch, two record players, and two auxiliary components. To suit your listening taste, thers are many controls for simple operation.
 Features
Powerful 140 watts (IHF) to generate amazingly transparent sound
Split electric power supply system
Direct coupled circuitry
Versatility in controls and simplicity in operations
Handsomely trimmed aluminum extrusion panel
Controls layout designed with optimum human engineering
Rotary - Speakers, Monitor, Selector and Volume
Slide - left and right Bass, left and right Treble, and Balance
Pushbuttons - Power, Low Filter, High Filter, Tone Defeat, Mode, Loudness and Audio Muting
Convenient headphone jack and power beacon
Facilities for two magnetic phonos, tuner, two tape recorders and two auxiliary components
Professional tape dubbing feature - from tape 1 to tape 2 or reverse
Three convenient AC outlets
Wood cabinet included
Specifications
Total Music Power (IHF):  140 W at 4 Ω
Continuous Power RMS (all at less than 0,5% THD and 1 kHz ):
42 W + 42 W each channel driven at 4 Ω
35 W + 35 W each channel driven at 8 Ω
37 W + 37 W both channel driven at 4 Ω
30 W + 30 W both channel driven at 8 Ω
Harmonic Distortion:  less than 0,1% at 27 W + 27 W into 8 Ω
IM Distortion:  0,15% before clipping at 8 Ω
Frequency Response:  5 to 100,000 Hz, -3 dB at 8 Ω
Power Bandwidth:  5 to 55,000 Hz, IHF at 8 Ω
Input Sensitivity/Impedance:
Phono ! :  2,5 mV/47 k Ω
Phono 2 :  2,5 mV/47 k Ω
Tuner :  150 mV'40 Ω
Aux 1, Aux 2 :  150 mV 40 k Ω
Tape Monitor IN :  230 mV/47 k Ω
Main Amp In :  800 mV/33 k Ω
Tape DIN :  330 mV / 100 k Ω
Signal-to-Noise Ratio:
Phono :  65 dB
Aux :  70 dB
Tuner, Tape In "  70 dB
Residual Noise: 1 mV
Damping Factor:  35 at 8 Ω
Loudness Control:  +10 dB at 50 Hz; +4 dB at 10 kHz
Bass Control :  ±10 dB at 10 kHz
Treble Control :  ±10 dB at 10 kHz
High Filter :  -10 dB at 10 kHz
Low Filter : -10 dB at 50 Hz
Muting Level:  -20 dB
Phono Overload:  over 100 mV
Phono Equalizer:
=17 dB at 50 Hz
-13,5 dB at 10 kHz
Crosstalk :  -40 dB at 10 kHz
Power Voltage "  AC 100, 117, 220, 240 volts
Dimensions (W x H x D):  16-1/2" x 5" x 9-1/2")
Weight:  12 lbs