CORAL A-7
¥ 33,800 (around 1965)
Commentary
A solid-state pre-main amplifier using transistors.
The circuit configuration is mainly based on the SEPP / OTL circuit method of 2SB425.
The power transistor is protected by a double protection circuit consisting of a positive star (heat-sensitive element) and a quick disconnect DC / FUSE.
Features such as tone control, scratch filter, rumble filter, and loudness control are included.
Model Rating
| Type | Stereo pre-main amplifier |
| Effective power | 50W(25W+25W) |
| Music power | 60W(30W+30W) |
| Frequency characteristic | 20 Hz to 20 kHz ± 1 dB |
| Input sensitivity | Player:3.8mV Tuner, Tape, and Aux : 120 mv Tape Monitor:330mV |
| Equalizer | Player : RIAA curve |
| Tone control | Bass : + 13 dB ~ -15dB (50 Hz) Treble : + 15 dB ~ -20dB (20 kHz) |
| Loudness control | 100Hz:+7dB 10kHz:+3dB |
| Accessory circuit | Tape recorder DIN connector Rumble filter Scratch filter Loudness control Tape monitor circuit Power transistor protective device |
| Semiconductor used | Transistor : 22 Diode : 6 pcs Pooster : 4 pcs |
| Power supply voltage | 100 VAC / 117 V, 50Hz/60Hz |
| Power consumption | 70W (maximum output) |
| External dimensions | Width 345x Height 136x Depth 260 mm |
| Weight | 6.8kg |