Superscope T-210 tuner

AM/FM Stereo Tuner

At Superscope, we think that all music lovers should be able to afford the unrivalled sound fidelity of separate components. That's why we designed our new T-210 stereo tuner.so you can enjoy the clean sound and sophistication of a component tuner at a price that's within reach of practically every budget.

How can we do it? Easy, Superscope is the same company that brings you famous Sony tape recorders and Marantx stereo components.

The Superscope t-210 offers a full complement of features for drift-free AM/FM tuning accuracy. When matched with our A-235 or A-245 stereo amplifier and a pair of Superscope speakers, you have a compact component system ideal for apartments, dorms, mobile homes and other less than spacious listening areas.

But most important, the Superscope T-210 is built to last. It's assembled under such meticulous quality control procedures that we back the T-210 with one of the most comprehensive guarantees in the industry; three full years on parts and labor.

Superscope's T-210 styled in the tradition of the finest stereo components in the world.

Features:

Push button On/Off Switch - separate switch lets you pre-set other controls and not have to move them to turn on/off power

Signal-Strength Tuning Meter - allows precise tuning of AM, FM stations; display shows when station is tuned in for clearest, distortion-free reception

Selector Switch - choose AM, FM, FM/AFC, or FM stereo

Balanced Flywheel Tuning - massive balanced flywheel tuning permits easy, convenient station selection

Antenna Inputs - hook up far-ranging 300 Ω  FM antenna, and AM antenna

Unique Superscope Family Appearance and Design - clean, functional styling features an integral walnut-grained case. Durable finish resists marring or staining. Slip-proof pads on the base prevent marring of furniture. The white gold anodized front panel keeps its like-new appearance for years.

 

Specifications

FM Section

Usable Sensitivity (IHF):  5 µV

Signal-to-Noise Ratio:  60 dB

Harmonic Distortion:  1,0% at 1,000 Hz

Image Rejection:  better than 40 dB

Antenna Impedance:  300 Ω

Quieting :  40 dB (at 10 µV); 60 dB (at 100 µV)

Capture Ratio:  6 dB

AM Suppression:  35 dB

Stereo Separation:  better than 30 dB

AM Section

Usable Sensitivity (IHF):  30 µV

Antenna:  Built-in ferrite core antenna and external terminals

Power Requirements:  120 Volts, 50/60 Hz

Dimensions (W x H x D):  14-21/64" x 4-31/64" x 7-15/16"

Weight:  5,3 lbs

 

Superscope T-208 tuner

AM/FM Stereo Tuner

With precise selectivity and low distortion, the all-new Superscope T-208 Solid-State AM/FM Stereo Tuner makes a great-sounding addition to any stereo system. And despite its economy price tag, the Model T-208 offers a full complement of sophisticated features. Like Flywheel Tuning, High RF Sensitivity, Superb Stereo Separation, Signal Strength Tuning Meter, Stereo Indicator Light, Indoor FM Dipole Antenna, and more. For extra convenience, connect the T-208 to your home tape recorder system. Its compact size allows it to be used in a variety of applications. And the walnut-grained cabinet matches any room decor. Superscope's T-208 Solid-State AM/FM Stereo Tuner. There's no other tuner so easy on your pursestrings with such high performance.

 

Specifications

FM Section

Usable Sensitivity (IHF):  5 µV

Signal-to-Noise Ratio:  60 dB

Total Harmonic Distortion:  1,0% at 1,000 Hz

Image Rejection:  better than 40 dB

Antenna Impedance:  300 Ω

Quieting :  40 dB (at 10 µV); 60 dB (at 100 µV)

Capture Ratio:  6 dB

AM Suppression:  35 dB

Stereo Separation:  better than 30 dB

AM Section

Usable Sensitivity (IHF):  30 µV

Antenna:  Built-in ferrite core antenna and external terminals

Dimensions (W x H x D):  14-21/64" x 4-3164" x 7-15/16"

Weight:  5,3 lbs

 

Rotel RT-322 tuner

AM/FM Stereo Tuner

Here is another excellent tuner from Rotel's fine line of superb AM/FM stereo tuners. With reception performance unmatched at this cost range, it is definitely made to accompany almost all classes of amplifiers. FM sensitivity of 2,0 µV along with capture ratio of 1,5 dB assures outstanding performance not found in other similar tuners. RT-322 deserves to be heard, especially when complemented by our RA-311 stereo pre-main amplifier.

 

Special features:

Sensitive FET front-end for precise reception

Four-stage IF circuit for efficient selectivity

All advanced solid state electronics design

Handsomely trimmed aluminum extrusion panel

Convenient muting pushbutton switch to eliminate interstation noise

Effective Multiplex filter to suppress stereo noise

Illuminated dial scale and large easy-to-see tuning meter

Linear and wide FM dial scale for easy tuning

Wood cabinet included

 

Specifications

FM section

Sensitivity (IHF):  2,0 µV

Frequency Range:  88 - 108 MHz

Total Harmonic Distortion:  less than 0,5%

Signal-to-Noise Ratio:  65 dB

Capture Ratio:  1,5 dB

Selectivity:  50 dB

Stereo Separation:  40 dB at 1 kHz

Image Rejection:  60 dB

IF Rejection:  80 dB

Spurious Response Rejection:  80 dB

AM section

Sensitivity (IHF):  200 µV/m

Frequency Range:  535 - 1606 kHz

Image Rejection:  50 dB at 1 MHz

IF Rejection:  50 dB at 1 MHz

Signal-to-Noise Ratio:  50 dB

Selectivity:  30 dB

General

Dimensions (W x H x D):  14" x 7-1/2" x 4-1/2"

Weight:  4 kg (8,8 lbs)

 

Rotel RT-222 tuner

AM/FM Stereo Tuner

Here is RT-222, one of Rotel's cost-performance out-performer. The product designed for those who want quality at low cost. In no way we have compromised Rotel's tradition of excellence in quality to developed this fine tuner. RT-222 has all the basic facilities you need to enjoy clear and distortion free broadcasting but with a touch of professionalism. A smooth flywheel action, a large efficient tuning meter and a linear dial scale would assure simple yet precise operation for optimum listening pleasure.

 

Special features:

Precision front-end to pull in broadcast clearly

 all solid state electronics design

Handsomely trimmed aluminum extrusion panel

Large tuning knob with crisp flywheel action

Function selector for AM, FM or FM Stereo

Linear FM dial scale for easy tuning

Accurate signal strength tuning meter for visible tuning

Wood cabinet included

 

Specifications

FM section

Sensitivity (IHF):  4 µV

Frequency Range:  88 - 108 MHz

Total Harmonic Distortion:  0,5%

Signal-to-Noise Ratio:  63 dB

Capture Ratio:  5 dB

Selectivity:  20 dB

Stereo Separation:  35 dB at 1 kHz

Image Rejection:  40 dB

IF Rejection:  60 dB

Spurious Response Rejection:  60 dB

AM section

Sensitivity (IHF):  250 µV/m

Frequency Range:  535 - 1606 kHz

Image Rejection:  50 dB at 1 MHz

IF Rejection:  40 dB at 1 MHz

Signal-to-Noise Ratio:  50 dB

Selectivity:  30 dB

General

Dimensions (W x H x D):  13" x 6-1/2" x 4"

Weight:  3 kg (7 lbs)

 

QUAD FM3 tuner

Stereo Tuner

The purpose of VHF/FM broadcasting is to provide reception, within the service area of the transmitter (normally 50 to 100 miles) free of interference and capable of reproduction at very high quality. The Quad FM3 tuner will completely fulfil this purpose with any transmission which arrives at the aerial in a condition capable of full quality recovery.

Outside the service area of the transmitter it is the nature of VHF/FM for signal strength to fall rapidly and there will be a tendency to fading but the high sensitivity of the FM3 tuner enables it to receive such signals with two reservations. a, no tuner can improve the signal/noise ratio of the signal as it arrives at the aerial and B, the considerable bandwidth essential for low distortion reproduction means that a weak station can be resolved only if it is sufficiently separated (i.e. by at least 400 kHz) from any other more powerful signal.

In most areas the local VHF.FM services are normally receivable at reasonable signal levels. Between these stations on the tuning scale, among the background noise, there will usually be distant stations spilling over from other areas. Because the FM3 inter-station noise suppression circuit is adjustable the owner can decide where to set the suppression level between complete silence between one strong station and the next, on the one hand, and no suppression at all so as to rake in every scrap of signal (and noise) on the other. Also as the suppression system provides muting until the station is correctly tuned, not only is background "hash" suppressed but the unpleasant noises associated with tuning through the sidebands of the station are also avoided, and with strong stations it is possible to proceed from one perfectly tuned programme through silence to the next perfectly tuned programme.

Operating the FM3 is simple, the only control on the front of the FM3 tuner being the tuning knob (which is also used for setting the station markers) and no others are required. The noise suppression adjustment is a pre-set control at the rear of the tuner and all other controls, Volume, Stereo-Mono switching, Mono Hold, ON/Off, are provided by the associated Quad 33 control unit.

The positions on the scale of any five stations may be indicated by pre-set markers. These are positioned by pressing the tuning knob to engage its pointer with each marker in turn, tuning to the stations to be marked and releasing the knob. The markers then stay in position for future reference. The tuning indicator is the original Quad twin lamp system which provides for simple, positive and highly accurate tuning. The tuner is self-powered.

 

Circuit Detail

The RF and frequency changer stages use protected, dual gate MOS FET, and the IF stages and decoder section IC devices. Tuning is by means of a three gang capacitor and the stability is such that AFC is unnecessary. To achieve (and maintain) the desired bandwidth and shape the tuner employs ceramic filtering.

The audio output is via a 5 pin DIN plug on which pins 3 and 5 carry either mono or left and right stereo channels respectively, according to the incoming programme, in addition pin-1 carries a separate mono output, useful if an over-ride facility is required.

 

Specifications

Frequency Range:  88 - 108 MHz

Sensitivity:  30 dB sig; noise for 1 µV

Aerial Input:  75 Ω  coaxial, 300 Ω  balanced

Full Limiting:  from less than 2 µV

Image Rejection:  56 dB

IF Rejection:  80 dB

400 kHz Selectivity:  46 dB

Capture Ratio:  3 dB

IF Bandwidth:  less than -3 dB at ±120 kHz, better than -60 dB at ±200 kHz

Output at 38 kHz and Above:  -50 dB

Frequency Response:  20 Hz - 15 kHz ±1 dB

Channel Separation:  40 dB at 1 kHz

Distortion (at 1 kHz, and ±40 kHz deviation):  0,3%

Output:  100 mV per channel for 30% modulation

Source Impedance:  5 k Ω

Recommended Load Impedance:  better than 50 k Ω

Recommended Load Capacity:  less than 1000 pF

De-emphasis:  50 µ Sec or 75 µ Sec as required

Power Input:  100-125 or 200-250 V, 50/60 Hz;  6VA

Dimensions:

Width :  260 mm

Height :  92 mm (freestanding), 83 mm (panel only)

Depth :  165 mm (freestanding), 140 mm (behind cabinet panel when mounted) plus 64 mm for connectors

Weight:  2,7 kg

 

Technics ST-S7 tuner

A Quartz Synthesizer Tuner That ls a Worthy Source of High Fidelity

The ST-S7 tuner provides listening quality which will convince you that FM broadcasts can, in fact, be sources of superb sound. To achieve this high level performance, we have departed from conventional tuner design in several areas. Two of the most significant design elements are the incorporation of digital signal processing technology and the introduction of DC amplification and detection (which is impossible to achieve through conventional analog designs). Benefits of this design include improved stereo separation especially in the low-bass range, for a faithful reproduction of musical ambience. This is achieved along with a very high selectivity of 85 dB (±400 kHz) indicating no trade off of selectivity vs. Separation as is the case with conventional designs.

We've also taken full advantage of the quartz synthesizer's potential by providing an optional FM antenna tuning control with our remarkably effective SH-F101 compact room antenna. All this is contained in a sleek, slim tuner with a 43.6 mm (1-23/32") high front panel. In appearance as well as performance, the ST-S7 is an excellent match for the recently introduced Technics "New ClassA" amplifiers.

 

DC Amplification, DC Detection, and DC Stereo Decoding for Excellent Sound Quality

DC capability has recently been introduced to amplifiers. Even though tuners are intended to handle the same audio signals as amplifiers, little progress has been made, until now, in DC tuner technology.

The instability of the local oscillator frequency produces this situation. In a superheterodyne dial-type tuner, a drift in local oscillator frequency creates inaccuracy in the IF center frequency. This results in increased distortion, which is caused by DC voltage in the detector. In a conventional analog tuner, this "output without input" can be corrected, but not prevented. Analog tuners employ AFC (Automatic Frequency Control) to correct this problem, but AFC handles all the DC voltages in the detector stage as erroneous signals. This makes it impossible to provide amplification and detection down to DC.

Unlike the conventional analog tuners, a quartz synthesizer tuner's local oscillator frequency is stabilized by the extremely precise quartz oscillator frequency. Since there is no need for AFC, this makes DC amplification (including the RF stage, DC detection, and DC stereo demodulation) possible.

By taking advantage of the inherent potential of the quartz synthesizer approach, we have produced the world's first DC tuner. ln addition to such a significant innovation, we've also added other useful features which imorove performance, like a balance detector output tor connection to the MPX stage.

 

DC Peak Sample and Hold MPX Circuitry Excellent Stereo Separation

The ST-S7 exhibits very high FM selectivity of 85 dB (±400 kHz),a figure that is rarely matched with conventional designs. Normally, tuners with such high selectivity  have sacrificed in the areas of distortion and stereo separation. But in the ST-S7 the employment of DC peak-sampling holding circuitry has removed this design conflict. Wide stereo separation (55 dB at 1 kHz)  is achieved despite the high selectivity of 85 dB and distortion is only 0.15% stereo. The keys to success are DC capability in the detector and MPX stages and the digital sample/hold processing  of the 38 kHz stereo subcarrier, which replaces the conventional switching decoder method. Because of the high sampling rate, additional information is obtained from the stereo channels. Moreover, frequency separation is un affecled by the potential instability of the 19 kHz pilot signal until the point of complete detuning.

 

25 kHz Quartz Reference Frequency

The reference frequency of the ST-S7's quartz synthesizer tuner is 25 kHz; most other quartz tuners use a reference frequency of 5 kHz. This is but one measure of the ST-S7's superior performance. Although it may seem contradictory to find a reference frequency within an audio band, this arose because of the ready availability of an lC that was originally developed for car stereo tuners. When the 5 kHz reference frequency of this lC leak sin to the audio signal path, a low-level whistling sound is produced. Distortion may not be audible in the relatively noisy environment of an automobile; but it is undesirable, to say the least, in a high quality tuner like the ST-S7. Therefore, we developed our own lC specifically for quartz synthesizer tuners. This new lC produces a highly stable reference frequency of 25 kHz, safely above the audio frequency spectrum.

 

Back-to-Back High-Q Varactors and MOSFET Front End to Prevent lM Interference and Provide High Sensitivity

On a crowded FM band, it is particularly  important to eliminate lM interference (which is caused by interference of three nearby broadcast frequencies) in the tuner's RF stage.

In the ST-S7, our back-to-back varactors (equivalent to a four-ganged variable capacitor) control capacitance through an applied DC potential rather than the manually controlled variation in capacitance found in dial type analog tuners. These varactors exhibit a very high Q so that only the desired broadcast frequency is selected, and intermodulation products from nearby stations are effectively avoided. The 4-pole MOS FET RF amp provides superb sensitivity of 20 µV (78 Ω )/46 dB quieting.

 

IF Staqe Ceramic Filters Have Outstanding Group Delay

Characteristics to Provide High Selectivity and Low Distortion Selectivity is extremely important on a crowded FM dial. With conventional tuners, you have two choices: a wide lF band with low distortion or a narrow lF band with higher selectivity and higher distortion. Because of this, some tuner sare provided with switchable wide/narrow lF bands.

In this tuner, we have succeeded in achieving both low distortion and wide selectivity by using three very carefully manufactured and selected 4-element ceramic filters which have very flat group-delay characteristics. Without resorting to lF band switching, we've attained a very high selectivity of 85 dB (± 400 kHz), while distortion is a very low 0,1% (mono); 0,15% (stereo)

 

Extremely Easy and Accurate Tuning with Quartz Synthesizer Preset Buttons for a Total of 16 Stations, 8 AM and 8 FM, Plus Quartz Lock Indicator

Perhaps the greatest advantage of quartz synthesizer tuning is that virtually perfect tunig can be achieved easily and quickly. Moreover, this completely electronic tuning system readily lends itself to preset capability, thereby eliminating the need for signal strength or center tuning meters.

To "manually" tune the ST-S7, you just press the UP or DOWN button. This lets you electronically scan the dial as long as you keep either the UP or DOWN button pressed. When you reach the desired broadcast frequency, the locked indicator lights up, indicating that the station that you have selected is precisely tuned in.

 

Built-in Programmable Timer for On/Off Tuning of Three Programs

The Technics-developed micro processor. Utilized for our quartz-synthesizer tuning, is so powerful that it can also provide a programmable timer function. This allows you to program the tuner to tune in the stations  you want at the times you choose. The programmable timer can be set to turn two programs off and on every day, and an additional program for one particular time and day of the week. So the tuning of three programs can be left entirely to the tuner. The timer also controls the power to the tuner's switched AC outlet so that your amp or tape deck will turn on at the same time as the programs are tuned in.

This tuner is equipped with a 24-hour quartz clock which provides great accuracy (+ 10, -0 seconds per month). In fact, it can serve as a digital clock when the TUNER OFF button is pressed.

To program the timer, simply set the program selector to WRITE and Dress the preset buttons for the times you want. Of course, you can cancel in the middle of a program (CANCEL) or check your setting (READ). While listening to a program, you can check on the preset time by pressing the CLOCK CALL button. The time will be displayed for about five seconds; then the tuned-in station's frequency will reappear on the digital display.

 

Specifications

FM Tuner Section

Frequency Range:  87,5 - 108,0 MHz

Sensitivity

S/N 30 dB :  0.95 µV  (75 Ω )

S/N 26 dB :  0.85 µV  (75 Ω )

S/N 20 dB :  0.75 µV  (75 Ω )

IHF Usable Sensitivity :  0.95 µV  (IHF '58 )

IHF S/N 46 dB Stereo Quieting Sensitivity:  20 µV  (75 Ω )

Total Harmonic Distortion

MONO :  0,1%

STEREO :  0,15%

Signal-to-Noise Ratio

MONO:  69 dB (77 dB IHF)

STEREO:  65 dB (72 dB IHF)

Frequency Response:

5 Hz - 18,000 Hz (+ 0,2 dB . - 0,5 dB)

5 Hz - l8 kHz (± 1,5 dB)

Alternate Channel Selectivitv: 85 dB (±400 kHZ); 55 dB (±300 kHz)

Capture Ratio:  1,0 dB

lmage Rejection (at 98 MHz): 80 dB

lF Rejection (at 98 MHz): 110 dB

Spurious Response Rejection (at 98 MHz): 95 dB

AM Suppression: 55 dB

Stereo Separation:  55 dB (at 1 kHz); 40 dB (at 10 kHz)

Carrier Leak:

At 19 kHz :  -65 dB (-70 dB, IHF)

At 38 kHz :  -48 dB (-50 dB , IHF)

Channel Balance:  250 Hz - 6300 Hz ±1,0 dB

Limiting Point:  0,7 µV

Bandwidth

iF Amplifier:  180 kHz

FM Demodulator:  1000 kHz

Antenna Terminals:  75 Ω  (unbalanced) F-type coaxial

AM Tuner Section

Frequency Range: 

530 - 1620 kHz (10 kHz step)

522 - 1611 kHz (9 kHz step)

Sensitivity:  30 µV , 250 µV/m

Selectivity:  55 dB

Image Rejection at 1000 kHz:  45 dB

IF Rejection at 1000 kHz:  50 dB

Timer Section

Clock:  Quartz-lock type 24-hour indication

Precision:  Within 0 to =10 sec. Monthly (at 25°C)

Function:  24-hour programmable every day: 2 times; once only: 1 time

Programmable Contenet:  Program source (FM,AM), Power On/Off timing; Designation of preset stations

Setting Intervals:  1 minute - 23 hours, 59 minutes

Priority Order:  Once, everyday 2, everyday 1

Memory "back-up":  about 3 months (without AC power)

General Section

Power Requirements:  AC 110/120/220/240 V 50/60 Hz

Power Consumption:  9,9 W

Batteries:  DC 45 V (3 "AA" size)

Dimensions (W x H x D):  430 x 53 x 310 mm (16-15/16" x 2-3/32" x 12-7/32")

Weight:  4,0 kg (8,8 lbs)

 

Aiwa ST-R30 tuner

AM/FM Stereo Tuner

An unpretentious tuner with some very impressive credentials, the R30 brings a new dimension in design and convenience to radio listening enjoyment.

Accurate Digital Display

Regardless of scale length, you're never quite sure where you're tuned with linear or rotary scales, because their graduations are usually too widely spaced to define tuning variations as close as 100 kHz (FM) or 1 kHz (AM). This alone is one big advantage of a property designed digital readout. For extra accuracy, the frequency counter IC in the R30's digital unit employs a quartz crystal which provides an unerring 6,4 MHz reference signal to ensure that tuning is held within a close ±25 kHz for FM or ±1,5 kHz for AM.

Superb Performance

For the best possible sensitivity and rejection of spurious signals, front end design employs a high stability cascade junction MOS FET. Moving on to the IF detector stage, outstanding 70 dB selectivity within 400 kHz is realized by use of ceramic filters specially chosen for the flattest possible group delay characteristics, which in turn has achieved low noise and distortion. Beautiful stereo separation (45 dB at 1 kHz) is maintained by means of a stable PLL IC in the MPX demodulator stage.

Other Features:
hi-bled circuit

5-LED signal strength indicator

FM stereo indicator

Antenna terminals for 75 oh and 300 Ω

FM muting/AFC combination switch

AM/FM indicator LED

Rack Handles included

 

Specifications

FM Section

Sensitivity

Mono : 1,9 µV (usable sensitivity)

Stereo :  43 µV (at S/N 50 dB)

Signal-to-Noise Ratio

Mono :  73 dB

Stereo :  70 dB

Total Harmonic Distortion

Mono :  0,1%

Stereo :  0,25%

Capture Ratio:  1,5 dB

Stereo Channel Separation:  45 dB (at 1 kHz)

Frequency Response:  30 - 15,000 Hz (+0,5 dB, -1,5 dB)

IF Rejection:  80 dB

AMSuppression Ratio: 55 dB

AM Section

Frequency Range:

MW :  525 kHz - 1,605 kHz

LW :  150 kHz - 285 kHz

Power Requirements:  240 V 50/60 Hz

Dimensions (W x H x D):  210 x 71 x 254,5 mm (8-5/16" x 2-13/16" x 9")

Weight:  2,1 kg (4,6 lbs)

 

Optonica ST-3535 tuner

Outstanding Features

Multipath Detector Circuit

The ST-3535 incorporates a meter and terminals for an oscilloscope to detect multipath distortion and a built-in circuit to monitor its composition. The degree of multipath distortion is indicated by the meter, by the sound volume or by the waveform on the oscilloscope. Therefore, the antenna direction is easily and accurately reset. The circuit also improves FM listening and assures optimum recording.

Built-in Air Check Calibrator

This is a unique device for accurate "FM Air Check". Just flip on the switch and a level signal equivalent to that of the FM signal is generated. Then all you have to do is set the recording level to 0 VU on the deck.

Monolithic ICs are employed, Inter-station noise is eliminated by the muting switch

A hi-blend switch to reduce noise during reception of weak FM stereo signal

Variable audio output level control

Signal strength meter - this meter responses in proportion to the degree of signal intensity, thereby rendering effortless tuning under any condition

Easy-to-read-and-tune FM linear dial with a frequency-linear type variable capacitor, 8-11/16" wide scale, large flywheel and smooth tuning mechanism

FM signal input attenuator reduces distortion due to high signal input levels for stable FM reception

The FM antenna is equipped with dual terminals for 300 ohms or 75 ohms

Composite signal output terminal is provided for future possible FM 4-channel broadcasting

 

Outstanding Performance

Dual-gate MOS FETs and FM front end equipped with 4-gang linear tuning capacitor

The FM front end consists of a 4-gang capacitor that employs a double-tuned RF amplifier stage and a mixing stage. Remarkable performance characteristics such as 2,5 µV IHF sensitivity. 80 dB spurious response rejection ratio and 85 dB IF rejection ratio are attained. These figures assure high sensitivity and stable reception.

IF stage designed for high selectivity and interference protection

To obtain both ultra-low distortion characteristics and high selectivity, a phase linear ceramic filter and differential IC circuit are employed to make the phase characteristics at the IF stage linear. The band pass characteristics is also greatly improved.

PLL MPX circuitry

The PLL (phase-Locked Loop) circuit replaces the conventional coils and associated components with ultra-reliable integrated circuitry. The PLL circuit automatically compensates for phase-shift, thus ensuring stable separation for long periods of use.

A sub-carrier trap with inductive M-type filter is employed

 

Specifications

FM Section

Frequency Range: 87,6 - 108 MHz

Antenna Input:  75 Ω  (unbalanced); 300 Ω  (balanced)

Sensitivity (IHF)

Mono :  2,5 µV (300 Ω  antenna terminal)

Image Rejection:  80 dB

IF Rejection:  85 dB

Spurious Response Rejection:  80 dB

AM Suppression:  43 dB (mod. 30% AM by 1 kHz and 100% FM by 400 Hz)

Capture ratio:  1,5 dB

Selectivity:  65 dB (±400 kHz, 65 kHz Dev.)

Signal-to-Noise Ratio

Mono :  65 dB (75 kHz  Dev. 1 kHz)

Total Harmonic Distortion

Mono :  0,4% (75 kHz  Dev. 1 kHz)

Stereo :  0,8% (75 kHz  Dev. 1 kHz)

Stereo Separation

34 dB :  1 kHz, 75 kHz Dev.

25 dB :  50 Hz - 10 kHz

Frequency Response:  45 Hz - 13 kHz (±1,5 dB)

AM Section

Frequency Range:  520 - 1620 kHz

Antenna:  Built-in ferrite loopstick antenna AM external antenna terminal

Sensitivity:  400 µV /m (IHF, ferrite antenna)

Selectivity:  25 dB (at 1,000 kHz)

Signal-to-Noise Ratio:  35 dB

Image Rejection:  55 dB (at 600 kHz)

Total Harmonic Distortion :  1,5%

Audio Section

FM Output

Fixed :  0,5 V (1 kHz, 75 kHz Dev.)

Variable :  0 - 1,0 V (1 kHz, 75 kHz Dev.)

A Output

Fixed :  0,15 V (30% Mod.)

Variable :  0 -0 ,3 V (30% Mod.)

Composit Signal Out Terminal:  Yes

General

Semiconductors:  2 MOS FETs; 5 ICs plus 1 aux IC; 10 Transistors plus 16 aux Transistors; 6 Diodes plus 15 aux Diodes

Power Requirements:  AC 120 50/60 Hz

Power Consumption:  24 W

Dimensions (W x H x D):  17-3/8" x 5-5/8" x 15"

Weight:  2 lbs

 

Toshiba ST-500 tuner

AM / FM Stereo Tuner

4-gang tuning condenser and dual gate 4-pole FET's in FM front end

Ceramic filters and two ICs consist of differential amplifier limiter in FM IF circuit

Linear, wide-scale dial, and two tuning meters, and AFC on/off switch, and FM muting circuit

RF amplification, double stage AGC and ceramic filter for low distortion and high AM sensitivity and for normal operation opposing strong signals

High-blend switch and manual FM/FM-stereo switch for improving Signal-to-Noise Ratio at weak FM stereo signal

Output terminal for future FM 4-channel broadcasting

Natural walnut cabinet

 

Specifications

FM Section

Tuning Range:  88 - 108 MHz

Intermediate Frequency:  10,7 MHz

Sensitivity:  1,8 µV (IHF); 1,8 µV (S/N=30 dB)

Signal-to-Noise Ratio :  66 dB

Capture Ratio:  1,5 dB

Selectivity:  80 dB (IHF)

Image Rejection:  80 dB

IF Rejection:  80 dB

Spurious rejection:  100 dB

AM Suppression:  50 dB (IHF)

Frequency Response:  20 - 15,000 Hz ±1 dB

Antenna:  300 Ω  (balanced); 75 Ω  (unbalanced)

Harmonic Distortion

Mono :  0,2% at 400 Hz (100% mod.)

Stereo :  0,5% at 400 Hz (100% mod.)

FM Stereo Separation:  better than 35 dB at 1,000 Hz

19 kHz, 38 kHz Suppression:  50 dB

AM Section

Tuning Range:  530 - 1605 kHz

Intermediate Frequency:  455 kHz

Sensitivity:  15 µV (IHF)

Signal-to-Noise Ratio:  45 dB

Image Rejection:  70 dB

Selectivity:  30 dB (±10 kHz)

IF Rejection:  70 dB

Overload:  2 V/m at 1,000 kHz

Harmonic Distortion: 1%

General

Circuit:  Superheterodyne [AM & FM] 2 ICs ; 3 FET's; 23 Transistors; 23 Diodes

Power Source:  AC 100/120/220/240 V ; 50/60 Hz

Power Consumption:  25 W

Output Level:  600 mV (fixed, 100% modulation) 0 - 2 V (variable)

Dimensions (W x H x D):  400 x 125 x 333 mm ( 15-3/4" x 4-7/8" x 12")

Weight:  5,6 kg (14-5/16")

Accessory:  FM feeder antennas, connecting cord, polishing cloth,

 

Sansui TU-919 tuner

Sansui Patented Digitally Quartz-Locked FM/AM Stereo Tuner with Impeccable Drift-Free Tuning Accuracy.

FM Fronted Sensitivity; Enhanced by low-noise Dual-Gate MOS FET and 5-gang Tuning capacitor

The extraordinary tonal quality of the Sansui TU-919 begins here. Crossmodulation and interference are avoided in the FM fronted using a low-noise Dual-Gate MOS FET RF amp and a wide-gap, frequency-linear 5-Gang variable capacitor of high precision. The 50 dB Quieting Sensitivity is an excellent 13,5 dBf (mono) and 35,5 dBf (stereo)

 

FM IF Selectivity; Very low group delay means much-improved sound.

Tonal quality is further enhanced by flattening transient group delay and phase distortion to achieve higher selectivity with lower distortion in the FM IF section. The real test of our IF circuitry comes when inputs from your antenna vary unpredictably in level.

Actual field tests show the effectiveness of the ten differential IF stages, contained in one Darlington-connected differential IC, and the linear-phase ceramic filters found here. Changes in signal level have hardly any effect on selectivity.

 

Patented Variable Group-Delay Equalizer; Distortion is further reduced

This is a unique device that permits the independent adjustment of the equivalent amount of Frequency Response of the IF signal within the bandwidth. This, in turn, helps eliminate any deviation, however minute, in group-deley response within the bandwidth. Higher Signal-to-Noise Ratio and lower distortion are also achieved.

 

FM Stereo Sound; Wider separation and purer fidelity from PLL

Stereo FM broadcasts are multiplexed with a "pilot" signal to trigger receiving tuners into the stereo mode and enable them to "decpde" the composite signal into left and right channels.  Once its job is done, that "pilot" (a 19 kHz signal) must be entirely removed from the audio signal. The conventional filter used for this can cause more problems than it prevents.

Such 19 kHz filters are usually positioned at the output of the stereo demodulator. Together with the "pilot" they also often filter out the upper end of the frequency response and cause phase distortion as well. Sansui avoids such filters in the TU-010 for a more musical sound.

Our stereo dempdulator is a PLL type with a special "pilot" cancelling circuit (not a filter) included in its IC. It eliminates the 19 kHz signal before it enters the switching or demodulation stage. Output of the demodulator amp is pure audio.

 

Wide-Range DC Configuration; More guarantees of cleaner sound.

As in the highly advanced Sansui AU amplifiers and our best Pure Power receivers, the DC amplifier configuration in the TU-919 offers cleaner audio reproduction in both AM and FM. Main advantages are; Wider dynamic range; Lower TIM distortion; and Superb frequency response all are vital to hi-fi. These parameters are made still more dependable by our reduction of the internal power-supply impedance across the widest possible frequency range. Reproduction is always well balanced.

 

Power Supply: Attention given to better sound localization

An error-correction/amplification constant-voltage circuit of an entirely new type is found in the power supply of the TU-919. it provides unfailing power regulation for constantly high performance quality. With impedance low throughout, musical textures remain crystal clear and sound-image localization in the reproduced sound field is the sharpest possible.

 

High-Power Drive Ratio Detectr; S/N and linearity are improved

A newly-developed, wide-range, high-power drive ratio detector, driven by a triple-base Darlington-connected IC, is used in the FM discriminator. It contributes to improved linearity and Signal-to-Noise Ratio. For more stability and still less noise we've housed the discriminator in a shielded casing, separate from the IF circuit.

 

Selectable IF Band for AM; Wide/Narrow improves reception

By broadening the signal-passing bandwidth in the AM tuner section, frequency range is dramatically improved. For this reason, you'll want to use the Wide position on the IF bandwidth selector. When the station to which you have tuned is strong enough, the results in improved high frequency response are impressive. On the other hand, weak or distant AM stations are received more clearly when you use the Narrow position; the interference caused by stronger station broadcasting on adjacent frequencies is dramatically lowered.

 

Sansui Exclusive FM Digitally Quartz-Locked System; Contained in a single LSI

We've combined a quartz crystal, providing a rock-steady reference base, with an error-free digital control in the TU919. this Sansui-exclusive system detects any tuning error caused by temperature, voltage and humidity changes and compensates for it instantly. Drift is now a thing of the past. Most other quartz tuners use analog phase reference controls that compare phase of two frequencies between the local oscillators and quartz crystals. In order to check and correct errors (drift). But our TU-919 doesn't instead it has a digital control system.

With it the frequency counter samples the local oscillator's frequency constantly, once every 0,01 seconds, timed by the accurate quartz. When there's an error, it's converted to digital units, which are then converted to voltage to control the local oscillator. When there's no error, the tuned frequency is locked to the station's frequency.

Sansui's digital processing doesn't use the kind of reference signal containing infinite harmonics; therefore, we've eliminated drift without compromising spurious response ratio, Signal-to-Noise Ratio sensitivity or other important specifications.

There more features make the Sansui system still easier to use. One, you need not remove your hand from the knob to make sure the station is surely quartz-locked. Two, locking range is wide, even rough tuning locks in the desired station and keeps it locked for hours. Three, should you turn off the tuner a built-in Re-Lock system memorizes your station for instant recall when you switch it on again.

Sansui has received patents on our Quartz/Digital-Lock System. And to ensure long-term reliability of its operation we've packaged it all in a single LSI with circuits equivalent to thousands of discrete transistors, resistors and diodes.

 

Specifications

FM Section

Tuning Range:  88 to 108 MHz

50 dB Quieting Sensitivity

Mono :  12,5 dBf

Stereo :  34,0 dBf

Sensitivity

Mono :  9,0 dBf (IHF), 0,95 µV (DIN)

Stereo :  15 dBf

Signal-to-Noise Ratio

Mono :  83 dB at 80 dBf (82 dB at 65 dBf)

Stereo :  80 dB at 80 dBf (76 dB at 65 dBf)

Frequency Response

Mono :  30 to 15,000 Hz +0,2 dB -0,5 dB

Stereo :  30 to 15,000 Hz +0,2 dB -0,5 dB

Total Harmonic Distortion

Mono :  less than 0,06% at 100 Hz (0,04% at 1,000 Hz)

Stereo : less than 0,09% at 100 Hz (0,06% at 1,000 Hz)

Captire Ratio:  0,9 dB

Adjacent Channel Selectivity

Wide :  5 dB at 200 kHz

Narrow :  18 dB at 200 kHz

Alternate Channel Selectivity

Wide :  50 dB at 400 kHz

Narrow ;  80 dB at 400 kHz

Spurious Response Ratio:  110 dB at 98 MHz

Image Response Ratio:  110 dB at 98 MHz

RF Intermodulation:  75 dB at 08 MHz

AM Suppression Ratio:  60 dB at 98 MHz

Stereo Separation

40 dB at 100 Hz

50 dB at 1,000 Hz

35 dB at 10,000 Hz

30 dB from 30 to 15,000 Hz

Antenna Input Impedance

Balanced :  300 Ω 

Unbalanced ;  75 Ω

Output Voltage/Impedance

Variable :  1 V/2,5 k Ω

Dolby FM :  200 mV/9 k Ω

AM Section

Tuning Range:  530 to 1600 kHz

Sensitivity: 47 dB/m at 1,000 kHz (220 µV/m)

Selectivity:  35 dB at 1,000 kHz

Signal-to-Noise Ratio :  50 dB

T.H.D.  Less than 0,35% at 30% Mod. 80 dB/m

Image Response Ratio:  70 dB at 1,000 kHz

IF Response Ratio:  70 dB at 1,000 kHz

General

AC Outlets:  Unswitched, total 100 watts

Power Requirements:  100, 120, 220, 240  V 50/60 Hz

Power Consumption:  22 watts

Semiconductors:  73 Transistors; 57 Diodes; 6 FETs; 16 ICs

Dimensions (W x H x D):  430 x 168 x 402 mm (16-15/16" x 6-5/8" x 16-1/2")

Weight: 9,6 kg (21,2 lbs)