SONY TA-P7F
¥ 69,800 (released on November 1, 1978)
Commentary
Compact pre-main amplifier of micro component PRECISE component.
We pursue compactness and high Croy by installing devices that are effective for miniaturization and high performance.
By using a heat pipe developed for audio equipment, the power transistor attached to the substrate can be directly cooled, and distortion factor characteristics and SN ratio are improved.
In addition, the amplifier element has features such as a small high-frequency switching distortion factor and a large frequency range and dynamic range.TTransistor is used.
We have newly developed and adopted solid state switches for function switches and monitor switches.
This switch is a semiconductor switch that turns signals ON/OFF by DC control. It can be remotely controlled inside the amplifier, and we have succeeded in greatly reducing the number of wires used for signals.
The power supply section is equipped with a pulse power supply.
Unlike conventional power supplies, pulse power supplies consist of electronic circuits, making it possible to reduce the size. In addition, since the power supply voltage hardly fluctuates, the regulation is good and the generation of harmful hum is suppressed.
In the equalizer amplifier section, an FET and a low-noise transistor are combined to lower the equivalent noise resistance to achieve higher SN.
In addition, with the adoption of pulse power supply, high gain amplifier is possible, and it is also compatible with MC cartridge.
The peak power indicator is used, and the standard output can be seen as 0/0.5W/5W/50W (at 8 Ω).
Uses an acoustic compensator switch that can compensate for the low range of small speakers.
Bus Boost 1 provides 150 Hz, 6dB/oct, and Bus Boost 2 provides 300 Hz, 6dB/oct.
Also equipped with a loudness control switch.
Model Rating
| Type | Stereo pre-main amplifier |
| Circuit system | Preamplifier section : NF-type equalizer amplifier, MC cartridge compatible Power Amplifier Part : Pure complimentary service SEPPP DC Power Amplifier Power Supply Part : Pulse Power Supply (PPS) |
| Power Amplifier Unit | |
| Effective power | 50W + 50W (8 Ω, double-channel drive, 20 Hz to 20 kHz, distortion rate 0.01%) |
| Output Bandwidth (IHF) | 5 Hz to 35 kHz |
| Harmonic distortion factor (at effective output) | 0.01% (20 Hz to 20 kHz) 0.007%(1kHz) |
| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.01% (Effective Output) |
| Frequency characteristic | 5 Hz ~ 70 kHz + 0 -1dB |
| Damping factor | 35 (8 Ω, 1 kHz) |
| Suitable speaker impedance | 8 Ω ~ 16 Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono1 mm : 2.5mV/50k Ω Phono2 mc : 0.25mV/100 Ω Tuner, Aux, Tape : 150mV/50k Ω |
| Signal-to-noise ratio (A network) | Phono1 MM:85dB Phono2 MC:70dB Tuner, Aux, Tape : 100 dB |
| Output Level / Impedance | Rec Out : 150mV/10k Ω |
| Phono maximum allowable input | Phono1:120mV Phono2:0.12mV |
| Frequency characteristic | Phono1 and 2 : RIAA deviation ± 0.2 dB Tuner, Aux, Tape : 3 Hz to 70 kHz + 0 -1dB |
| Tone control | Bass : 60 Hz ± 10 dB (turnover frequency : 300 Hz) Treble : 25 kHz ± 10 dB (Turnover Frequency : 5 kHz) |
| Filter | Low : 20 Hz, 6dB/oct. |
| <General> | |
| Semiconductor used | Transistor : 28 FET : 4 pcs IC : 9 Diode : 47 Units |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 83W |
| Power outlet | Power switch interlock : 1 system, 100W Power switch not linked : 2 systems, 100W |
| External dimensions | Width 215x Height 80x Depth 330 mm |
| Weight | 3.7kg |