CORAL TA-7700

Commentary

Stereo receiver using IC and FET.

It uses a SEPP-ITL-OTL circuit that does not use an input transformer or an output transformer. It also uses a diffused silicon power transistor to achieve high output.

All signal circuits are composed of silicon transistors to realize broadband characteristics.

In order to solve the problem of the transistor amplifier, which is said to have a harder sound than the tube type amplifier, the tone quality control circuit developed in-house is mounted.

The Phono1 terminal has a built-in head amplifier to increase sensitivity, and MC type cartridges can be connected without an input transformer.
The Phono2 terminal is compatible with MM type cartridges.

It is equipped with a pure electronic protection circuit by adopting SCR.
This circuit operates when the output terminal is short-circuited and protects the power transistor from damage accidents.

Two types of speakers can be connected.

It uses a loudness control, tape monitor, high-cut and low-cut filters, headphone jack and DIN connector.

The IF section of the FM tuner consists of five stages, and the reliability and characteristics are improved by adopting IC.
By using FET in the RF circuit, intermodulation distortion is greatly improved.

To prevent interference between SCA and FM broadcasts, an SCA filter with an attenuation of 50 dB or more is installed.

A muting switch is mounted to reduce inter-station noise during FM tuning and detuning.

It is equipped with an AGC (Automatic Gain Control) circuit to prevent distortion of sound by a strong electric field that receives strong radio waves from the antenna.

Silicon diodes are used in the MPX circuit to reduce the effect of ambient temperature changes on the separation.

Equipped with FM mono-stereo automatic switching circuit.
The FM stereo display lamp lights up during stereo broadcast transmission, and a malfunction prevention circuit is built in to prevent lighting due to external noise.

It is designed with extruded aluminum material.

There was a wood case sold separately.

Model Rating

Type	FM/AM Receiver
Amplifier Unit
Music power	160W (8 Ω)
Effective power	50W/50W (8 Ω)
Total harmonic distortion factor	Not more than 0.8%
Frequency characteristic	20 Hz to 40 kHz ± 2 dB
Output band characteristic	20 Hz to 20 kHz -3dB
Signal-to-noise ratio	Phono1:60dB Phono2:65dB Aux:70dB
Input sensitivity	Phono1:0.04mV Phono2:2.5mV Aux:200mV
Damping factor	30 (8 Ω)
Loudness control (Volume-30dB)	100 Hz : + 6 dB, 10 kHz : + 3 dB
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 8 dB (10 kHz)
Low filter	50 Hz, -8dB
High filter	15 kHz, -8dB
Speaker impedance	4 Ω ~ 16 Ω
FM Tuner Section
Sensitivity	2 μ V (IHF)
Image ratio	65dB
Frequency characteristic	20 Hz to 20 kHz ± 2 dB
Total harmonic distortion factor	0.7% or less (1 kHz, 100% modulation)
Signal-to-noise ratio	60dB
Stereo separation	40dB
<AM Tuner Section>
Sensitivity	20 μ V (IHF)
Image ratio	50dB
<General>
Semiconductor used	Transistor : 42 Diode : 27 units Thermistor : 4 pcs Pooster : 2 pcs SCR : 1
Power supply voltage	AC100V/117V/220V/240V
Power consumption	45W (no signal) 350W at maximum output
External dimensions	Width 475x Height 150x Depth 420 mm
Weight	12.5kg
Sold Separately	Wood case