Onkyo TX-4500

 The Onkyo Quartz-Locked Receiver, compare it against every known receiver. You'll see there's no comparsion.

Quartz-Locked technology is a dramatic breakthrough in automatic drift-free and virtually distortion-free FM reception.

There are no buttons to push, no switches to throw, nothing extra to do to lock in a signal. Once a station is tuned in, it's locked in. Quartz-Locked in. And any factor which can cause tuner drift is automatically compensated for so the TX-4500 assuresconstant pinpoint FM reception, maximum channel separation and minimum distortion.

But that's only the FM story. There's virtually nothing you can't accomplish with the TX-4500.

Flawless programs come off records and tapes. Or use the TX-4500 to make your own tapes. Or mix your own programs with multiple tape inputs and dubbing.

 The TX-4500 does it all. Rated according to FTC specs, the TX-4500 delivers 55 watts minimum RMS per channel, both channels driven into 8 ohms over a 20 Hz to 20 kHz spectrum, showing less than 0,1% THD.

In addition, the TX-4500 also evidences exceptional transient response, the ability of an amplifier to follow sudden changes in the level of sound signals. Dual oscilloscope traces, with  a 50 Hz square wave fed through, have shown less than a 5% tilt.  Generally, conventional amplifiers under the same conditions have shown a 25-50% tilt.

The onkyo Quartz-Locked Receiver offers one more important advantage - outstanding value for superior performance.

 Quartz-Locked Tuning Creates A New Degree of Tuning Accuracy

In a radical departure from conventional FM tuner design principles, Onkyo engineering has created a quartz oscillator controlled circuitry for the most accurate station tuning possible. A superbly stable frequancy is generated in a quartz oscillator, and this unvarying frequency becomes the reference for the tuned stages of the FM circuits. Even the slightest deviation from ideal tuning condition is detected instantly and compensated automatically, assuring razor-sharp tuning and minimum distortion at all times.

Automatic "Human Touch Sensor"

As you touch the tuning knob, a special sensor circuit detects your touch and relases the above-named quartz lock. Then, after you have tuned in another station and relased the knob, the quartz circuit lokcs again. You need not even tune in a station very preciselly, as the quartz lock will automatically compensate for tuning errors.

Enormous Reserve of Output Power

The ultra-moder, all direct coupled amplifier section delivers 55 W of clean Onkyo power per channel into 8 ohms, over the entire frequency range from 20 Hz to 20 kHz, with both channels driven, at no more than 0,1% THD. In practical terms, this means that you heve a tremendous reserve of power available to handle even sustained high volume levels and signal peaks without driving the amplifier into clipping distortion.

Total Control Over What You Hear and How

In addition to the standard balance, high and low filter, mode and loudness controls, the TX-4500 features click-stop volume and tone controls giving accurately reproducible settings. Its FM Muting Lock switch eliminates inter-station noise on FM, and its Dolby Adaptor switch establishes the correct (25 µsec) deemphasis for Dolby processed FM broadcasts.

 Prepared for Future System Expansions

The TX-4500 can serve as the heart of an astounding, elaborate audio system for home and professional uses. It can drive three pairs of speakers, can accommodate two turntables and three tape dekcs, a Dolby noise reduction adaptor, and FM 4-channel decoder for areas with 4-channel FM broadcasting, and it can even be adapte for such advanced applications as equalizer, multi-amplifier and P.A. system. The TX-4500, in other words, know few limits.

Massive, Modernistic Styling

Technological excellence inside has its counterpart in the solid looking external appearance with its protruding glass panel and heavy battery of controls.

Specifications

Amplifier Sections

Power Output:

65 watts per channel (min. RMS, 4 Ω both channel driven, 20-20,000 Hz, 0,1% THD)

55 watts per channel (min. RMS, 8 Ω both channel driven, 20-20,000 Hz, 0,1% THD)

Total Harmonic Distortion:  0,1% at rated power ( 0,08% at 1 watts output)

IM Distortion:  0,3% at rated power (0,1% at 1 watts output)

Damping Factor: 50 (8 Ω, 1 kHz 10 watts)

Frequency response:  15 - 30,000 Hz (±1 dB) / 2 - 80,000 Hz (±1 dB at main amplifier)

Tilt (sag):  better than 5% at 50 Hz

Sensitivity and Impedance:

Phono 1, 2 :  2,5 mV/ 50 k Ω

Tape Play 1, 2, 3 :  150 mV/50 k Ω

Tape Rec 1, 2, 3 :  150 mV/50 k Ω

Dolby Out :  150 mV/50 k Ω

Dolby In :  580 mV/50 k Ω

Pre Out :  1 V/ 3 k Ω

Main In :  1 V/100 k Ω

Phono Overload:  200 mV RMS 1 kHz 0,1%

Bass Control :  ±10 dB at 100 Hz

Treble Control:  ±10 dB at 10 kHz

Signal-to-Noise Ratio:

Phono :  65 dB (IHF C Network)

Tape :  80 dB (IHF C Network)

Filters:

High :  6 kHz at 6 dB/oct

Low :  100 Hz at 6 dB / oct

Tuner Section

Tuning Range:

FM :  88 - 108 kHz

AM :  530 - 1605 kHz

Usable Sensitivity FM:

Mono :  1,8 µV (10,3 dBf)

Stereo :  5 µV (19,2 dBf)

50 dB Quieting Sensitivity FM:

Mono :  4 µV (17,2 dBf)

Stereo :  40 µV (37,2 dBf)

Intermediate Frequency:

FM :  10,7 MHz

AM : 455 kHz

Capture Ratio FM:  1,5 dB

Image Rejection Ratio:

FM :  70 dB

AM :  40 dB

IF rejection Ratio:

FM : 100 dB

 AM :  40 dB

Signal-to-Noise Ratio:

FM [mono/stereo] :  70 dB / 65 dB

AM :  40 dB

Alternate Channel Att. FM :  70 dB

AM Suppression Ratio FM:  50 dB

Harmonic Distortion FM:

Mono :  0,2%

Stereo :  0,4%

Harmonic Distortion AM:  0,8%

Frequency Response FM:  30-15,000 Hz +0,5 -2 dB

Stereo Separation FM:  40 dB at 1 kHz (30 dB at 100-10,000 Hz)

Muting Level FM :  4 µV (17,2 dBf)

Stereo Lamp Level FM :  4 µV (17,2 dBf)

Quartz Lock level FM :  4 µV (17,2 dBf)

Tuning Meters:  signal Strength and Center Tuning

Antennas:

FM :  300 Ω balanced or 75 Ω unbalanced

AM :  Built in ferrite core antenna and external terminal

Semiconductors:  1 FET; 70 Transistors, 8 ICs; 59 Diodes

Power Supply:  120 V or 220 V 50/60 Hz

Dimensions (W x H x D):  583 x 163 x 430 mm (21-3/16" x 6-7/16" x 16-15/16")

Weight:  16,6 kg (36,5 lbs)

Cabinet:  Walnut grained vinyl over lauan plywood