National SA-71
¥ 50,000 (around the late 1960 s?)
Commentary
Pre-main amplifier with all-transistor configuration.
National's unique MFB system is adopted.
OTL system is adopted.
Built-in automatic stabilizer prevents transistor damage.
The MFB switch can be used for ordinary speakers.
Model Rating
Type | Pre-main amplifier | ||||
Input terminal | Aux, Tuner, Phono, Tape Mic | ||||
Input Impedance (1 kHz) | Phono, Tape, Mic : 30k Ω Aux, Tuner : 100k Ω |
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Output | 50W(25W+25W) | ||||
Tone control | CR Type ± 16 db | ||||
Rumble filter | 70 Hz, -12dB/oct. | ||||
Scratch filter | 6 kHz, -12dB/oct. | ||||
Loudness control | Switch Switching, Continuously Variable Type | ||||
Load impedance | 8 Ω ~ 16 Ω | ||||
Semiconductor used |
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Pwer | 100 VAC, 50Hz/60Hz | ||||
External dimensions | Width 390x Height 148x Depth 299 mm | ||||
Weight | 13.8kg |