National/Panasonic SA-40
¥ 59,800 (around the late 1960 s)
Commentary
A stereo receiver that uses an OCL circuit and takes the ITL and OTL systems one step further.
Using an OCL circuit without the output capacitor, the speaker is completely connected directly.
In the OCL circuit, the NF can be applied in a stable state because there is no phase shift in the low range and no decrease in the output, and low distortion rate, expansion of the power band width and improvement of the damping factor are possible.
The tone control uses an NF type with an excellent S/N ratio and low harmonic distortion.
All of the transistors in the preamplifier section are PNP-type divorce transistors to minimize noise.
The front-end of the FM tuner section uses an FET to increase sensitivity, while the large-size IFT realizes sharp selection performance.
The preamp section and main amplifier section can be used independently.
Two speaker outputs are installed.
Black dial and slide control are adopted.
Model Rating
| Type | Stereo integrated amplifier |
| Amplifier Unit | |
| Music Power (IHF) | 55W (4 Ω) 40W (8 Ω) |
| Effective power | 12W/12W (8 Ω) |
| Total harmonic distortion factor | Not more than 0.8% |
| Output bandwidth | 10 Hz to 50 kHz -3dB |
| Frequency characteristic | 20 Hz to 60 kHz ± 3 db |
| Signal-to-noise ratio | 60 dB or more (Phono) |
| Load impedance | 4 Ω ~ 16 Ω |
| Damping factor | 20 (4 Ω) 40 (8 Ω) |
| Input Sensitivity / Impedance | Phono Low : 3.5mV/50k Ω Phono High : 10mV/100k Ω |
| Control switch | Bass, Treble Selector switch Mode switch Speaker change switch |
| High filter | 6 kHz, -6dB/oct. |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Sensitivity (IHF) | 2.8 μ V |
| Total harmonic distortion factor | 0.7% or Less (400 Hz) |
| Signal-to-noise ratio | 60 dB or more |
| Image ratio | 55 dB or more |
| Channel separation | 35 dB or More (1 kHz) |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1,605 kHz |
| Sensitivity (IHF) | 20 μ V |
| Selectivity | 25 dB or more |
| Image ratio | 40 dB or More (1 kHz) |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| External dimensions | Width 406x Height 127x Depth 356 mm |
| Weight | 20.1kg |