Onkyo T-4

 Onkyo T-4 Solid State AM/FM Stereo Tuner with Servolocked Tuning.

Onkyo maintains its leadership position in solid state audio components with the only Servolocked tuner made in Onkyo's T-4. servolocked is a unique, proprietary circuit designed by Onkyo to provide virtually driftfree tuning for days on end in actual test.

The Servolocked circuit loop is under the automatic electronic control of another unique system, Sensitouch, which senses electronic components of your body. Thus, when you touch the tuning knob, automatic "Human Touch Sensor" alerts and unlocks the control circuit, allowing tunung while muting simultaneously cancels noise. When the meter swings into "Lock-on" area, a front panel indicator reads "Locked". When you release the tuning knob, the circuit locks on to optimum tuning; the meter is center-set, and the "Tuned" indicator lights to show you have perfect reception with maximum separation and minimum distortion.

To sum up, the T-4 has ease of tuning with pinpoint accuracy.

 Phase Locked Loop MPX Stereo

Clean, sharp stereo reception and separation is assured by Onkyo's use of a Phase Locked Loop circuit which synchronizes the stereo pilot signal in phase and frequency with the received signal.  Phase shift is avoided and stereo separation is stable at 40 dB (1 kHz) and 30 dB (100 - 10,000 Hz).

Front-end Sensitivity

Sensitivity and low distortion are a function of the superbly designed front end featuring a 4-gang variable capacitor with a specially selected FET. Usable sensitivity is 1,9 µV (mono) and 4,5 µV (stereo0, and the IF Rejection Ratio is 90 dB.

IF Sensitivity

Carrying fine performance throughout, Onkyo engineering provides 3-stage phase linear ceramic filters in the FM Intermediate Frequency Stage, resulting in maximum frequency response (30 - 15,000 Hz, +0,5 -2 dB) and low distortion. You get an alternate channel attenuation of 60 dB, and AM Suppression Ratio of 50 dB for low noise brilliance.

Specifications

Tuning Range:

FM :  88 - 108 MHz

AM :  530 - 1605 kHz

Usable Sensitivity:

FM [Mono/Stereo] :  10,8 dBf (1,9 µV) / 18,3 dBf (4,5 µV)

AM :  25 µV

50 dB Quieting Sensitivity [Mono/Stereo]:  16,1 dBf (3,5 µV) / 37,2 dBf (4,5 µV)

Intermediate Frequency:

FM :  10,7 MHz

AM :  455 kHz

Capture Ratio FM:  1,5 dB

Image Rejection Ratio:

FM :  60 dB

AM :  40 dB

IF Rejection Ratio:

FM :  90 dB

AM :  30 dB

Spurious Rejection FM:  85 dB

S/N Ratio:

FM [Mono/Stereo]:  70 dB / 60 dB

AM :  40 dB

Alternate Channel Attenuation FM:  60 dB

AM Suppression Ratio FM:   50 db

Harmonic Distortion:

FM [Mono/Stereo]:  0,2% / 0,4%

AM :  0,8%

Stereo Separation FM:

40 dB :  at 1 kHz

30 dB :  from 100 Hz to 10 kHz

Sub Carrier Suppression FM:  60 dB

Muting Level FM:  17,2 dBf (4 µV)

Stereo Threshold FM:  17,2 dBf (4 µV)

Servo Locked level FM:  17,2 dBf (4 µV)

Frequency Response FM:  30 Hz - 15 kHz  (+0,5 -2 dB)

Output Voltage:

FM :  0 - 1 V

AM :  0 - 0,3 V

General

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

Power Consumption:  11 W (120 V)

Semiconductors:  5 ICs; 1 FET; 16 Transistors; 24 Diodes

Dimensions (W x H x D):  444 x 159 x 380 mm (17-1/2" x 6-1/4" x 15")

Weight:  6,1 kg (13,4 lbs)