Audio Database

SA-R30
Commentary

An air check amplifier that integrates an FM/AM tuner, cassette deck and pre-main amplifier.

The deck mechanism uses an electronically controlled DC motor to drive the capstan, a DC motor to drive the reel, and an IC logic control.

A unique SP (Solid Permalloy) head is used for the recording / reproducing head.

Metal tape is supported and the tape selector is equipped with 3 positions.

It has built-in Dolby NR circuit.

Equipped with an automatic music selection mechanism (TPS) that is convenient for starting a song, you can fast forward / rewind a song with one operation.

Equipped with rec mute, recording / playback timer standby, and 2-color LED level meter.

The FM front-end section of the tuner uses a junction FET and a high-precision 3-row varicon in the RF stage, and two ceramic filters in the IF stage to increase selectivity.

A PLL-IC is used in the MPX demodulation circuit to improve reliability against temperature and humidity changes.

Equipped with a 5-point 2-LED signal strength meter that shows the electric field strength.

The main amplifier section has a simple circuit configuration with two high-integration ICs and one transistor.
The input stage IC is a differential amplifier with a current mirror load capable of selecting an operating current with low distortion, and is connected to the pre-drive transistor of the next stage by an emitter follower.
Moreover, the power ICs of the complimentary service stage consist of a two stage Darlington semi-output circuit.

The phono equalizer uses a first stage differential amplifier current mirror load.

Equipped with a microphone mixing circuit.

Equipped with tone control and Rec out jacks.

Model Rating
Type Air check amplifier
Amplifier Unit
Effective output (both channel drive, 8 Ω) 30W + 30W (40 Hz to 20 kHz, 0.05%)
30W + 30W (1 kHz, 0.05%)
Total harmonic distortion factor 0.05% (40 Hz to 20 kHz)
Damping factor (8 Ω) 20
Load impedance 6 Ω ~ 16 Ω
Input Sensitivity / Impedance Phono : 2.5mV/47k Ω
Aux/TV : 150mV/47k Ω
Mic : 2.0mV/22k Ω
Phono maximum allowable input (1 kHz, RMS) 120mV
Signal-to-noise ratio Phono:76dB
Aux/TV:80dB
Mic:70dB
Frequency characteristic Phono : 40 Hz to 20 kHz ± 1.0 dB
Aux/TV : 10 Hz to 60 kHz + 0 -3dB
Mic : 20 Hz to 25 kHz + 0 -3dB
Tone control Bass : 50 Hz, ± 10 dB
Treble : 20 kHz, ± 10 dB
Loudness control (Volume -30dB) 50Hz:+9dB
Output level Rec out:150mV
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Practical Sensitivity (IHF, 75 Ω) 10.3 dBf, 0.9 μ V
S/N50dB sensitivity (75 Ω) Mono : 18.5 dBf, 2.3 μ V
Total harmonic distortion factor mono:0.2%
Signal-to-noise ratio mono:75dB
Frequency characteristic 20 Hz to 15 kHz + 1-2 dB
Effective selectivity 60dB
Capture ratio 1.0dB
Image Interference Ratio (83 mhz) 50dB
Spurious interference ratio (83 MHz) 80dB
AM suppression ratio 55dB
Stereo separation 40dB
Leak Carrier (19 khz, 38 khz) -35dB
Antenna terminal 75 Ω (Unbalanced Type)
<AM Tuner Section>
Receiving frequency 525 kHz to 1,605 kHz
Sensitivity 30 μ V, 300 μ V/m
Selectivity 30dB
Image interference ratio (999 kHz) 45dB
IF interference ratio (999 kHz) 40dB
Cassette Deck Part
Truck type 4-track 2-channel stereo
Head Used Rerecording : SP heads
Erasing : 3-gap ferrite
Motor used For Capstan : Electronically Controlled DC Motor
For Reel : DC Motor
Recording bias system AC bias system
Bias frequency : 85 kHz
Erasing method AC erasing method
Tape speed 4.8cm/sec.
Frequency characteristic Normal-20 Hz to 15 kHz
CrO2, XAII : 20 Hz to 16 kHz
Metal : 20 Hz to 17 kHz
Signal-to-noise ratio 52 dB (XAII, peak level)
62 dB (Dolby NR in, 5 kHz or higher)
Wow and flutter 0.05%(WRMS)
<General>
Pwer 100 VAC, 50/60Hz
Power consumption 85W
External dimensions Width 430x Height 117x Depth 360 mm
Weight 9.5kg