Technics SA-R30
¥ 89,800 (released in 1981)
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 |