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

Arcam Alpha 2 Tuner

 The Arcam Ralpha 2
This tuner has successfully established a distinctly “British” identity, with attractively classic ergonomics. A modest price plus sound quality comfortably better than most are further reasons for a “best buy”

The diversity and quality of modern broadcasting is demanding new levels of performance from today’s hi-fi tuners. In particular, a natural, clear and dynamic sound from FM coupled with the versatility of MW and LW reception of popular programmes, are the criteria most desired by serious music lovers and audiophiles. The Arcam ALPHA 2 STEREO TUNER FROM a&r Cambridge admirably fulfills thee requirements at an economic price.

The tuner has been designed to provide the highest quality reception of programmes transmitted on both the FM/VHF and AM broadcast bands. Although suitable for use with all quality stereo amplifiers, the Alpha 2 tuner is specifically styled to match with both Arcam’s outstandingly successful 30 watts per channel Alpha 2 amplifier and the high performance electronics in our. Delta series

 Ease of operation
The tuners controls have been deliberately kept to a minimum to ensure simple, fuss free operation. Three interlocked push buttons are used for selection of the wavebands, each band using the rotary tuning control for precise tuning. Additionally, for FM reception, an AFC switch is fitted to compensate for small frequency drifts or slight mistuning which may occur. A mono switch is provided to ensure better reception of weak stations. A red LED beacon indicates when a stereo programme is being received. The large rotary tuning control is fly-wheel assisted to produce an excellent “feel” and is coupled to an extended analogue tuning scale, featuring a unique dual role frequency pointer. On MW and LW the pointer glows green but on FM it doubles as a precise tuning indicator, changing colour in traffic light sequence as it moves onto a station and turning green when the station is exactly on tune. Station markers are provided to indicate the position of favourite programmes.

The design has been realized using high quality components selected for optimum sonic performance. Detailed theoretical analysis and extensive listening has produced exceptional results, the sound quality in particular on FM being firm, precise and without annoying sibilance. The use of a “birdie” filter fitted before the stereo decoder considerably reduces the unpleasant whistles caused by closely positioned stereo broadcasts. On the long and medium wvebands careful design has improved reception especially on the “crowded” night time airwaves, and results in a clearer, more informative sound.
 Quality and reliability
Great care has also been taken in every aspect of the design, construction and lignment of the Arcam Alpha 2 tuner to ensure years of consistent, trouble free operation. All componemts are operated well within their ratings. Internal wiring and connectors are all but eliminated by mounting all components (except indicators) on a single glass fibre Printed Circuit Board. Every tuner is rigorously checked at all stages of production, both for performance and appearance. All are tested and aligned using advanced custom built equipment and finally ‘burnt in” and retested before dispatch to ensure ultimate reliability.
The Arcam Alpha 2 tuner is provided with a ready made 75 ohm dipole wire aerial for FM reception and a specially designed loop aerial for AM use. Nevertheless, for best results, in areas of anything but prime reception, it is nearly always better to add appropriate external aerials in order to provide the tuner with the best possible input signal. 
FM Tuner Section
Tuning Range:  87,5 - 108 MHz
Sensitivity:  1,4 µV (IHF)
Total Harmonic Distortion (95 MHz ref. 22,5 kHz dev. At 1 kHz):
Mono :  better than 0,15%
Stereo :  better than 9,25%
Signal-to-Noise Ratio:
Mono :  better than 70 dB
Stereo:  better than 68 dB
Frequency Response:  20 Hz - 12 kHz ±0,5 dB; typically -2 dB at 15 kHz
Channel Separation (1 kHz): better than 40 dB
Pilot Tone Syppression:  better than 50 dB
Capture Ratio:  1,5 dB
Alternate Channel Selectivity:  better than 60 dB
AM Suppression:  better than 50 dB
AM Tuner Section
Frequency Range: 
MW range :  530 - 1600 kHz
LW range :  160 - 270 kHz
Distortion:  0,4% at 50% modulation
Signal-to-Noise Ratio:  50 dB (CCIR weighted) ref. 30% modulation
General Section
Output Impedance:  1,8 k Ω
Recommended Load:  20 k Ω or greater
Output Level:  800 mV at 75 kHz deviation
Spares Kit:  FM ribbon aerial; AM loop aerial; phono-phono lead; station markers
Power Supply:  200 - 250 V AC, 6 VA (100 - 120 V AC conversion possible)
Dimensions (W x H x D):  430 x 84 x 230 mm (16,9 " x 3,3" x 9,1")
Net :  2,6 kg (5,7 lb)
Packed :  3,2 kg (7,0 lb)

Onkyo Integra T-9090 II

 Onkyo Integra T-9090 II Computer-Controlled FM Tuner

The Integra Series Sound
Onkyos Integra series of hi-fi components is dedicated to a simple yet elusive goal; the accurate recreation of the full sonic impact of a live performance with all its immediacy and excitement.
The T-9090II epitomizes this dedication. A worthy addition to integra line, this FM-only tuner sets a new world standard in FM reception and operating convenience. Nothing less would be enough; nothing less would be Integra.

Computer-Controlled Five-Mode APR (Automatic Precision Reception) System
The five-mode APR system in the T-9090II monitors the quality of the FM broadcast being received and automatically sets a total of five reception modes (antenna [A/B], RF mode [DX/local], IF bandwidth [wide/narrow/S-narrow], hi-blend [on/off] and mode [stereo/mono]. APR provides optimum FM quality with computer controlled accuracy and convenience. All modes can be changed either manually or by remote control if necessary. You can even preset them in memory.
 High Sensitivity and Selectivity
The T9090IIs reception of weak FM stations, whether over the air or cable, is outstanding; 50 dB quieting sensitivity is a remarkable 0,8 µV. Selectivity has also been substantially improved over the previous version, for clear reception of weak stations even if powerful local channels broadcast on adjacent frequencies. The selectivity specification of 80 dB, adjacent channel, ±300 kHz sets a new standard in FM tuner performance.

SFR (Sonic Noise Filtering Reception) Anti-Microphonic Circuit
Though known for their low distortion. Synthesizer tuners are extremely sensitive to mechanical vibrations. If sound pressure from the speakers causes the chassis to vibrate, these vibrations can in turn be translated into distortion-causing electrical voltages. If these spurious elements find their way into the music signal; the tuner will sound distorted and unmusical. This phenomenon is known as the microphonic effect. Onkyo’s SFR system uses electrical means to fight microphonic interference at its source; the synthesizer section. This innovative technology greatly contributes to the astonishing sonic purity and naturalness of the T-9090II.
 Top Quality Construction
Onkyos unwillingness to compromise on quality is no where more evident than in the solid construction of the T-9090II. This tuner is built to last, from the copper front end shielded case, pure copper bus ground lines (five in all) to the shielded casings for the digital and power supply blocks. In addition, the chassis of the T-9090II is specially designed to prevent microphony, incorporating a damping steel base panel to keep mechanical vibrations to a minimum.

Other Features:
Automatic or manual antenna selection (A or B)
Cable FM compatibility with 25 kHz tuning steps and cable FM fine tuning mode
Multi-function digital display
Designed for sonic excellence with strictly selected electrical components
20-stations memory
Preset memory scan previews all preset stations by tuning in each one for five seconds
Adjustable output level
31-key remote control included
Auto scan memorization puts strong frequencies in memory automatically
Power supply filter
Timer program preset tuning
Wood grain side panels included
Tuning Range:  87,5 – 108,0 MHz
Tuning Steps:
Manual mode : 25 kHz step
Auto mode :  50 kHz steps
Usable Sensitivity:
Mono :  0,8 µV (S/N 26 dB, 40 kHz DE.) DIN
Stereo :  20,0 µV (S/N 46 dB, 40 kHz Dev.)DIN
50 dB Quieting Sensitivity:
Mono :  15,8 dBf (1,7 µV)
Stereo :  37,2 dBf (20 µV)
Capture Ratio:  1,0 dB
Image Rejection Ratio:  100 dB
IF Rejection Ratio:  100 dB
Signal-to-Noise Ratio:
Mono :  95 dB (IHF)
Stereo :  85 dB (IHF)
Selectivity:  80 dB (+-300 khz IF: super narrow)
AM Suppression Ratio:  60 dB
Total Harmonic Dostortion:
Mono :  0,009% (IF wide)
Stereo :  0,02% (IF wide)
Frequency Response:  30 – 15,000 Hz (+0,5 dB -1,0 dB)
Stereo Separation:
55 dB at 1 kHz  (IF wide)
33 dB at 70 10,000 Hz (IF wide)
Output Voltage:  0 – 1,5 V
Dimensions ( W x H x D):  465 x 103 x 387 mm (18-5/16” x 4-1/16” x 15-1/4”)
Weight:  8,5 kg (18,7 lbs)

Pioneer PD-71

 Pure and simple - Hardly the words you'd expect to describe what may well be one of the world's most technically superior compact disc players.
But while you may find the Elite PD-71 compact disc player's specifications impressive, we think you'll truly appreciate its reason for being.
It's the one compact disc player designed and dedicated to the true music lover. Clearly when your only design criterion is musical excellence, there's no place for compromise.
This single minded devotion to the music purist has yielded a number of refinements in both construction and circuitry of the PD-71. for example, it employs a true 18-bit converter with liner envelope technology to provide the highest accuracy at even the lowest signal levels.

Significant advancements are also evident in the new laser pickup on the PD-71, including a specially designed floating base for cleaner reproduction free signal.
Sonic purity is further enhanced by extensive anti-resonance construction and direct wire connections throughout the unit.
The PD-71 also features defeatable display circuitry, full random play and full remote control. Even the ergonomically designed panel displays and controls are testimony to elegant simplicity.
The Elite PD-71 compact disc player - now nothing can come between you and your music - that the pure and simple truth.
Channels:  two channel Stereo
Frequency Response:  2 Hz - 20 kHz (±0,3 dB)
Signal-to-Noise Ratio:  112 dB or more
Dynamic Range:  99 dB or more
Channel Separation:  108 dB or more
Harmonic Distortion:  less than 0,002%
Output Voltage:  2,0 V
Wow and Flutter:  Limit of measurement ±0,001% W.Peak or less
Output Terminals:
Digital Output:
Coaxial Output :  0,5 vp-p (75 Ω)
Optical Output :  -15 dBm to -20 dBm (wavelength 660 nm)
Power Requirements:  AC 120 V, 50 Hz or AC 220 - 240 V, 50/60 Hz
Power Consumption:  21 W
Dimensions (W x H x D):  457 x 127 x 324 mm (18" x 5" x 12-3/4")
Weight:  9,5 kg (20 lb 15 oz)

Pioneer PD-S701

 Pioneer PD-S701 Compact disc player
Direct linear transformation by High-Speed-1-Bit-D/A PulseFlow converter
Stable Platter Mechanism - new construction for effective suppression of resonances and vibrations
Resonances and vibrations absorbing construction - wall reinforced chassis and big damper feet

Channels:  two channel Stereo
Frequency Response:  2 Hz - 20 kHz
Signal-to-Noise Ratio:  108 dB or more
Dynamic Range:  96 dB or more
Harmonic Distortion:  less than 0,0026%
Output Voltage:  2,0 V
Wow and Flutter:  Limit of measurement ±0,001% W.Peak or less
Output Terminals:
Audio Line Output: 1 x Variable and 1 x Fixed
Optical Digital Output:  1 x Jacks
CD-Deck Synchro:  1 x Jack
Headphone:  1 x Jack (with motor drive volume control)
Power Requirements:  AC 120 V, 50 Hz or AC 220 - 240 V, 50/60 Hz
Power Consumption:  15/16 W
Dimensions (W x H x D):  420 x 130 x 276 mm (16-9/16" x 5-2/16" x 10-7/8")
Weight:  4,2 kg (9 lb 4 oz)

Yamaha T-1

 Yamaha T-1
The Yamaha T-1 is designed and built to deliver the kind of audio performance that more than matches that of recent model stereo amplifiers, especially in areas critical to the quality of reproduced sound. For example, the FM MPX demodulator - which determines the quality of FM stereo sound - is a Yamaha-developed, highly advanced DC-NFB-PLL switching circuit built around a DC amplifier of especially high slew rate. This new development holds distortion to below 0,3%, signal-to-noise ratio at least as high as 100 dB and stereo separation above 70 dB.
Another instance of the T-1's technical excellence is found in its advanced FM pilot cancelling circuit which tracks both the level and phase of the 19 kHz pilot signal and eliminates it completely befotre it reaches the switching circuit. This dramatically reduces the intermodulation distortion, enhancing the tuner's frequency response to an incredibile DC - 18,000 Hz.

More important, the superb audio performance of the T-1 is based on a minimum FM selectivity of 55 dB in the Local mode, thanks to Yamaha's FM IF Differential Gain Direct View Analysis. While the 55 dB selectivity is an excellent figure that guarantees superb audio performance from normal strength FM signals. The T-1 will automatically switch over to the DX mode when it detects enough interference to deteriorate the quality of the signal. In the DX mode, the tuner offers exceptionally high 92 dB selectivity, thus always assuring excellent audio performance above a prescribed level.
Advanced Circuit Configuration.
Sensitive FM Frontend
Selectable Local/Auto DX Modes for FM IF
Yamaha Exclusive Technology in Stereo Demodulator
Yamaha's Tracking-Type Pilot Signal Pure Canceller
FM Muting Circuitry, OTS and AM
Extended-Range Signal Quality Meter and Tuning Meter
FM Blend Switch
Recording Calibrator Switch
Two Pairs of Output
FM Section
Tuning Range:  88 - 108 MHz
50 dB Quieting Sensitivity [mono/stereo]:  3 µV (14,8 dBf) / 35 µV (36 dBf)
Usable Sensitivity (IHF 98 MHz, mono, 40 kHz dev.):
300 ohm :  1,7 µV (9,8 dBf) / 1,1 µV (DIN)
75 ohm :  0,85 µV (9,8 dBf) / 35 µV (DIN)
Image Response:  90 dB
IF Response Ratio:  100 dB
Spurious Response Ratio:  100 dB
AM Suppresion Ratio (IHF):  65 dB
Capture Ratio:  1,0 dB
Alternate Channel Selectivity (IHF): 
DX Mode :  92 dB / 65 dB (DIN)
Local Mode :  55 dB / 35 dB (DIN)
Signal-to-Noise Ratio (at 85 dBf):
Mono :  86 dB / 80 dB (DIN)
Stereo :  84 dB / 78 dB (DIN)
Distortion MONO (at 65 dBf):
Local / DX at 100 Hz :  0,05% / 0,1%
Local / DX at 1 kHz :  0,05% / 0,15%
Local / DX at 6 kHz :  0,08% / 0,3%
Distortion STEREO (at 65 dBf):
Local / DX at 100 Hz :  0,05% / 0,5%
Local / DX at 1 kHz :  0,05% / 0,5%
Local / DX at 6 kHz :  0,08% / 0,8%
Intermodulation Distortion (IHF)
Mono Local/DX :  0,05% / 0,5%
Stereo Local/DX :  0,08% / 1,0%
Sub-carrier Product Ratio:  70 dB
Stereo Separation [Local/DX]:
At 1 kHz :  55 dB / 30 dB
At 50 kHz :  45 dB/ 25 dB
At 10 kHz :  45 dB/ 25 dB
Frequency Response:  50 Hz - 10 kHz ±0,3 dB;  30 Hz - 15 kHz ±0,5 dB
Muting Threshold:  5 µV (19,2 dBf) Auto DX Mode
AM Section
Tuning Range:  525 - 1605 kHz
Sensitivity (IHF):  15 µV
Selectivity (IHF):  30 dB
Signal-to-Noise Ratio:  50 dB
Image Response (1 khz):  70 dB
Spurious Response (1 kHz):  70 dB
Total Harmonic Distortion:  0,4%
Audio Section
Output Level/Impedance (1 kHz)
FM (100% mod. Vol. Min-Max):  0,1 - 1,0 V/ 220 Ω
FM (100% mod. Vol. Center):  0,5 V/ 2,5 k Ω
AM (30% mod. Vol. Min-Max):  2,5 - 250 mV/220 Ω
AM (30% mod. Vol Center):  125 mV/2,5 k Ω
Recording Calibration Output (333 Hz, corresponding to FM 50% modulation):
Vol Min-Max :  50 - 500 mV / 220 Ω
Vol. Center :  250 mV / 2,5 k Ω
Semiconductors"  60 Transistors; 5 ICs; 2 Zener Diodes; 2 LEDs; 1 FET, 2 FM ceramic filters; 2 block ceramic filters; 1 AM ceramic filters
Power Supply:  available for all supply voltages and frequencies
Power Consumption:  12 W - 13 W
Dimensions (W x H x D):  435 x 97 x 376 mm (17-1/8" x 3-7/8" x 14-7/8")
Weight:  5,7 kg (12 lbs 9 oz)

Heathkit AA-100

 Value Leader in the Industry - The versatile and powerful AA-100 features 5 pairs of inputs like; magnetic cartridge, AM and FM tuners, stereo tape reocrder, FM stereo tuner and auxiliary; separate monophonic input, versatile  controls, (preamp input level, power amp input level, hum balance, ganged volume, balace and separation  and separate concentric bass and treble controls); three different speaker impedance (4, 8, 16 Ω); plus left, right and center channel speaker outputs.

Styling Matches the AJ-41, easy-to-own.  The luggage-tan vinyl-clad steel cabinet with polished trim and soft refracted lighted slide-rule dial matches the AJ-41 styling above. You enjoy this, deluxe features, performance and styling, at the unbelievable low price. 
 Deluxe Heathkit "Tube-Type" Stereo Amplifier.
Offers  versatile performance, finger-tip convenience and modern styling
AA-100 Features:
Hi-Fi rated ar 50 watts (25 watts per channel)
Five stereo input  and versatile controls
Mixed channel center speaker output
Separate monophonic phono input
Easy circuit board assembly
Matches the AJ-41 tuner in styling and performance
 Due to the equalization present in Phono and Tape Head positions, the meter readings for these inputs contain a considerable amount of random low-frequency noise, most of which is sub-audible.  Such noise is due to thermal agitation in tubes and resistors, contact resistance effects in electrolitic capacitors, power line variations, etc. In evaluating noise, the audibility of its various components must be considered. The extreme input sensitivity (1 mV) of the AA-100 Tape Head input must also be borne in mind.
The actual 60 Hz hum (and harmonics) included in the readings is very  small, compared to the mostly sub-audible noise components referred to above. As a matter of fact, the AA-100 is almost completely free from hum, for practical purposes.
Channels:  Two channel stereo.
Power Output:  
Monophonic :  50 watts
Stereophonic : 25 watts per channel
Music Power Rating
Monophonic :  60 watts (0.7% THD, 1 kHz)
Stereophonic :  30 watts (0,7% THD, 1 kHz)
Power Response:   30 Hz to 15 KHz  ±1 dB at 25 watts output per channel.
Harmonic Distortion:  
Less  than 0.5% at 25 watts, 1 kHz .
Less than 2% at 25 watts 30 - 15,000 Hz  (each channel).
Intermodulation Distortion:  less than 1% at 25 watts, 60 and 6,000 Hz signals mixed 4:1 (each channel).
Hum and Noise:  
Mag phono 55 dB below 25 watts output at 6 mv sensitivity
Tape Head :  35 dB below 25 watts output.
Tuner and aux : 70 dB below 25 watts output.
Channel Separation:  42 dB  min. at 1 kHz  
Input Sensitivity (For 25 watts output per channel)
Mono  Mag. Phono :  1.5 mV
Stereo Mag. Phono :  1.5 mV
Tape Tead :  1 mV
Tuner :   0.2 V
Aux 1 & 2 0.2 V
Input Impedance:
Mag phono :  47 K Ω  (may be changed)
Tape  Head :  470 K Ω
Tuner & Aux :  250 K Ω each.
Outputs:  4, 8 and 16 Ω ; cathode follower tape recorder outputs.
Damping factor: 15
Channel Sepration:  42 dB minimum at 1 kHz  
Phono :  RIAA curve
Tape Head :  NARTB  tape playback curve,
Tone Controls:
Bass :  15 dB boost and 17 dB cut at 30 Hz
Treble :  12 dB boost and 20 dB cut at 15,000 Hz
Controls: Function switch (4-position); selector switch (6-position); balance control (total range, 16 dB); separation control; ganged level controls; dual-concentric bass & treble controls; phase and power switch.
Tube complement:  2 x EF86, 4 x 12AX7, 2 x 7199, 4 x 7591, 1 x GZ34, 1-selenium bias rectifier.
Power requirements:  117 volts, 50/60 Hz
Power  Consumption:  150 watts.
Power Outlets:  2 AC receptacles, 1 switched, 1 unswitched.
Dimensions (H x W x D):  5" x 15¾" x 13½" (allow 1" for cables at rear).
Shipping Weight:  34-1/2 lbs.
Net Weight:  28-3/4 lbs

Schematic Heathkit AJ-41

 Schematic of the Heathkit professional Stereo Tuner model AJ-41

Heathkit AJ-41

 Heathkit AJ-41 Tuner has many interesting features, some of which are quite unique. The Tuner will receive monophonic AM or FM , or stereo FM. Individual meters monitor AM and FM tuning, a neon lamp is incorporated to indicate when a FM stereo signal is received. Another feature is a FM squelch circuit, which eliminates between station noise when tuning across the FM band. Cathode follower output stages provide low line impedance to avoid hum and high frequency losses in the interconnecting audio cables. With a FM stereo output, the cathode followers perform separately as left and right channel output stages; on monophonic AM or FM, the two output stages are tied together and supply the same information to both the left and right channel amplifiers of a stereo system.
 Deluxe Heahtkit "Tube-Type" AM/FM and FM stereo Tuner
Built-in FM multiplex adapter
Broad-band circuitry for full fidelity
Automatic FM Stereo indicator light
Adjustable Automatic Frequency Control for drift-free reception
Stereo phase control for maximum separation and lowest distortion
Adjustable FM squelch circuit for low noise between stations
Preassembled tuning unit, prealigned coils

Deluxe Features For Deluxe Performance. Compare the price and features of this renowned Heathkit Stereo tuner. Here is deluxe styling with luggagetan vinyl-clad steel cabinet, polished anodized trim, and refracted lighting of the big slide-rule dial, matches the Heathkit AA-100 amplifier.
Here are convenience features for easy operation, finer performance. Just flip a switch and chose FM, FM stereo,or AM listening. In addition there's an automatic stereo indicator light, built-in stereo adapter, automatic frequency control for clear, drift-free reception, adjustable FM squelch to assure complete silence while tuning, and a stereo phase control for maximum station separation, minimum distortion.
 Heavy die-cast flywheels are used on the tuning controls to give smooth tuning action. A "unitized" chasis design provides for rigidity and ease of kit assembly before being incorporated into the final assembly.
Control versatility is essential to good performance from a high quality tuner. All controls are arranged to offer maximum versatility without an excessive number of knobs.
Completely separate circuits are used for the AM and FM portions of the Tuner to avoid compromising performance. The multiplex circuit is used only in the Stereo position of the Mode Selector switch. Silicon diode rectifiers are used in the power supply because of their long life, dependability, and the fact that essentially no heat is generated in this type of rectifier. A choke is used in conjunction with the silicon rectifiers to improve regulation and to minimize hum. The heavy duty, electrostatically-shielded power transformer isolates the circuitry from the power line.

For Added Convenience - there are individual AM and FM tuning meters, flywheel tuning action, built-in antennas plus external antenna connectors, a fidelity switch for normal or maximum AM fidelity; and a preassembled, prealigned front-end to insure professional performance.  Assembly takes just a couple of evenings.
FM Section
Tuning Range:  88 - 108 MHz
Intermediate Frequency (IF):  10,7 MHz
Antenna:  300 Ω balanced
Output Impedance (Cathode Follower):  variable to 4000 Ω
Output Voltage:  Nominal, 0,5 volt with 3 µV, (30% modulation in)
Quieting Sensitivity:
2 µV for 20 dB of quieting;
3 µV for 30 dB of quieting
20 µV for full quieting, 40 dB
Audio Frequency Response:  20 - 20,000 Hz, ±2 dB
Maximum Deviation Sensitivity:  5 µV, 400 Hz 100% modulation in,
Deviation Sensitivity:  20 kHz (1100 µV in)
Harmonic Distortion:  less than 1% (1100 µV, 400 Hz 100% modulation)
Intermodulation Distortion:  lesss than 1%
Image Ratio:  40 dB
Capture Ratio:  12 dB
AFC Correction Factor:  12 dB
Amplitude Modulation Suppression:  25 dB
Hum and Noise:  40 dB below 30% mod. (20 µV in)
FM Stereo Converter Section
Audio Frequency Response:  50 - 15,000 Hz ±2 dB
Subcarrier Bandpass:  23,000 - 53,000 Hz ±3 dB
Channel Separation:  30 dB at 1 kHz; 25 dB at 10 kHz
Hum and Noise:  -55 dB relative to 1 volt RMS output
Output Impedannce (Cathode Follower):  variable to 4000 Ω, each channel
Outputs:  Left - Right channel
AM Section
Tuning Range:  535 - 1620 kHz
Sensitivity, Normal Position: 
at 1400 kHz : 3 µV
at 1000 kHz :  4 µV
 at 600 kHz :  8 µV
Sensitivity Change, Normal to Maximum:  -5 dB
Intermediate Frequency (IF):  455 kHz
Antenna:  Built-in rod, with provisions fro external straight wire)
Output Impedance (Cathode Follower):  variable to 4000 Ω
Output Voltage:  Nominal 3 volt
IF Band Width: 
Normal :  14 kHz (6 dB down)
Maximum :  20 kHz (6 dB down)
Image Ratio:  1400 kHz (50 dB);  600 kHz (75 dB)
Harmonic Distortion:  less than 1%
Hum and Noise: 35 dB below 30% modultion (1000 kHz with 100 µV in)
IF Rejection Ratio:  1400 kHz (42 dB);  600 kHz (38 dB)
10 kHz Rejection:  40 dB
Tube Complement:  5 x 6AU6; 2 x 6BA6; 1 x 6BS8 or 6BZ7; 1 x 6AB4; 2 x 12AT7; 1 x 6AL5; 1 x 6BE6; 2 x 12AU7; 1 x 12BH7
Power Supply:  Transformer-operated, silicon rectifiers.
Power Requiremants:  117 V, 50/60 kHz
Power Consumption:  100 watts
Dimensions (H x W x D):
Overall :  5-1/4" x 15-1/2" x 14-1/4"
Panel Mouting :  4-1/4" x 14-1/2" (Cutout); 12-7/8" (Depth)
Weight [net/shipping]:  18,5 lbs / 22 lbs

Sansui TU-X301

Sansui TU-X301 Quartz-PLL Digital Synthesizer Tuner 

Special Features:
Auto/manual tuning modes
FM noise canceller
Indicators for Stereo, Locked and Signal
 Digital synthesizer frequency front end
Applying digital technology to the front end of a tuner can improve reception dramatically. With a tuned frequency firmly locked by a PLL circuit, a station cannot drift out of tuner no matter how long the tuner remains on. But digital synthesis goes beyond that. Stations can be tuned, or scanned, at the light top of a button.

Presets for 6 FM and 6 AM stations
The TU-X301 gives you direct access to up to 6 FM and AM stations. Just preset them and commit them into memory, and any station is instantly recalled at the touch of a button.
Usable Sensitivity:  10,8 dBf
50 dB Quieting Sensitivity:
Mono :  16,0 dBf
Stereo :  36,0 dBf
Total Harmonic Distortion (at 65 dBf):  
Mono :  0,08%
Stereo :  0,12%
Signal-to-Noise Ratio (at 65 dBf):  
Mono :  76 dB
Stereo :  72 dB
Aleternate Channel Selectivity:  70 dB
Spurious Response Ratio:   75 dB
IF Response Ratio:  80 dB
Dimensions (W x H x D):  448 x 46 x 227 mm
Weight:  2,3 kg

Pioneer SX-737

 High sensitive FM/MW stereo receiver Features:
2 x 50 watts RMS with THD less than 0,5%
Dual meter tuning system with FM-linear dial scale
Stable PLL MPX section.
IF circit with 5-stage limiter and high-performance IC
Four element phase-linear ceramic filters provide very high selectivity.
Automatic protection ciecuit.
Unique recording selector.
With its extraordinary engineering, advanced design concept and extreme flexibility, Pioneer's new SX-737 AM-FM stereo receiver offers a level of performance that can only be described as awesome. Its exceptional FM reception is achieved through the use of phase lock loop circuitry, ceramic filters, and a dual-gate MOS FET. So it cleanly and clearly picks up stations that were once just numbers on the dial - without interfernce.
The SX-737 has more than enough power to satisfy your needs. It delivers 35 watts per channel, minimum continuous power, 20 Hz - 20 kHz, maximum total harmonic distortion o,5% at 8 ohms. And all of this power is smooth and stable with dual power supplies driving direct-coupled circuitry.

It accommodates every listening interest with a complete range of connections for two pairs of speakers, turntable, tape decks (wwith tape-to-tappe duplication), headphones and microphone. And it offers an exclusive Recording Selector that lets you record FM while listening to records, or vice versa.
All of this performance requires the proper controls to handle it. And the SX-737 gives you the kind of control mastery you deserve. Click-  stop tone controls, high/low filters, loudness control, dual tuning meters, and FM muting.
FM Section
Sensitivity (DIN) 26 dB/S/N, 40 kHz dev:  1,3 µV
Sensitivity (IHF):  1,9 µV
Capture Ratio:  1 dB
Selectivity:  60 dB
Signal-to-Noise Ratio: 70 dB
Image Rejection:  better than 80 dB
IF Rejection: better than 100 dB
AM Suppression:  55 dB
Harmonic Distortion [Stereo]:  less than 0,4%
Frequency Response:  20 Hz - 14 kHz +0,2 dB -2 dB
Stereo Separation:  better than 40 dB (1 kHz)
Subcarrier Suppression:  40 dB
MW Section
Sensitivity (IHF):  15 µV
Image Rejection:  40 dB
IF Rejection:  70 dB
Audio Section
Continuous Power Output (both channel driven):
At 1 kHz, 4 Ω :  2 x 50 W
At 1 kHz, 8 Ω :  2 x 40 W
20 - 20,000 Hz 8 Ω :  2 x 35 W
Total Harmonic Distortion (at rated output power, 1 kHz):  less than 0,5%
Power Bandwith:  5 Hz - 60 kHz
Frequency Response (at AUX input):  15 Hz - 40 kHz +0,5 dB -1 dB
Input Sensitivity?Impedance:
Phono Mag :  2,5 mV/50 k Ω
Microphone :  2,5 mV/50 k Ω
Tape Monitor :  150 mV/50 k Ω
Aux : 150 mV /50 k Ω
Dimensions (W x H x D):  500 x 158 x 410 mm
Weight:  13,2 kg