Audio Database

SA-54
Commentary

Integrated amplifier with all-silicon transistor configuration.

ITL and OTL circuits are used in the main amplifier section. The transformer is removed from both the input and output to create a complete transformerless circuit using a low-noise PNP silicon transistor, which realizes high output power and low distortion.
We have also adopted an all-transistor design and a PNP type silicon transistor for the driver circuit to reduce noise.

It has separate terminals for the preamplifier and main amplifier, and each can be used independently.

The front end of the FM tuner uses a two stage FET amplifier and a four stage varicon, which improves sensitivity and selectivity as well as cross-modulation and spurious interference.
In addition, the IF stage employs a 5-stage amplifier and a 2-stage direct-coupled limiter to eliminate external noise and Radio noises and improve reception capability.

A ceramic filter with sharp selectivity is adopted in the FM multiplex section, and malfunction due to inter-station noise is suppressed by improving moisture resistance and heat resistance.

The AM tuner section eliminates the disadvantages of the transistor-type AM receiver by applying a forward AGC to the high-frequency stage. The AM tuner section also incorporates a ceramic IF filter, which exhibits excellent characteristics against heat and moisture, and provides a wide reception band and sharp selection performance by utilizing mechanical resonance.
High-sensitivity ferrite antenna is used for the antenna.

Model Rating
Type Stereo integrated amplifier
Circuit system Quasi complimentary service SEPP-ITL-OTL
Main Amplifier Section
Music Power (IHF) 45W + 45W (4 Ω)
40W + 40W (8 Ω)
Effective power 36W + 36W (4 Ω)
31W + 31W (8 Ω)
Total harmonic distortion factor 0.5% (1 kHz at rated output)
Output bandwidth 15 hz to 70 khz -3dB
Damping factor 50 (8 Ω)
Frequency characteristic 20 Hz ~ 90 kHz + 0 -3dB
Residual noise 1.5 mv or Less (8 Ω)
Preamplifier Section
Frequency characteristic Phono : 30 Hz to 50 kHz ± 1 dB
Aux : 30 Hz to 50 kHz ± 3 dB
Input Sensitivity / Impedance Phono : 3mV/50k Ω
Aux, Tape : 160mV/35k Ω
Signal-to-noise ratio Phono : 65 dB or more
Aux : 80 dB or more
Equalizer (NF Type) Phono : RIAA
Tone control Bass : ± 10 dB (50 Hz)
Treble : ± 10 dB (10 kHz)
Loudness control 100 Hz : + 7 dB, 10 kHz : + 3.8 dB
Low filter 70 Hz, -12dB/oct.
High filter 7 kHz, -12dB/oct.
Input terminal MAG, Ceramic, Aux, Tape
FM antenna terminal
AM antenna terminal
Output terminal Headphones, Tape
Speaker (2 systems)
AC outlet
DIN connector Route 1
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Sensitivity (IHF) 1.8 μ V
Distortion factor Mono : 0.5% or less (400 Hz, 100% MOD)
Signal-to-noise ratio 60 dB or More (1 kHz, 100% MOD)
Image interference ratio 80 dB or More (84 MHz)
Stereo separation 40 dB or More (1 kHz)
<AM Tuner Section>
Receiving frequency 525 kHz to 1,605 kHz
Sensitivity (IHF) 20 μ V
Signal-to-noise ratio 60 dB or more
Image interference ratio 70 dB or More (1,000 kHz)
Antenna Ferrite antenna
<General>
Semiconductor used Transistor : 53
FET : 2
Diode : 29 units
Pwer 100 VAC, 50Hz/60Hz
Power consumption 220W at maximum output
External dimensions Width 500x Height 129x Depth 357 mm
Weight 12.5kg