National SU-200D
¥ 33,000 (around 1970)
Commentary
A multi-channel divider with a built-in main amplifier.
You can easily start multi-amp playback by adding it to a stereo system, etc.
There are six levels of crossover frequency, from 250 Hz to 8 kHz, which can be used according to the characteristics of the speaker.
There is also an unlock button with a fixed crossover frequency to prevent accidentally changing the crossover and causing the input of the speaker system to be over.
By adding two or three SU 200 d units, multi-amplifier playback of up to seven channels is possible.
The volume of the pre-main -main amplifier with the level control of the SU 200 d, you can freely control each level of the multi-amplifier.
All stages are directly connected OCL circuit for main amplifier section.
Model Rating
| Type | Channel tipper with built-in main amplifier |
| Main Amplifier Section | |
| Music power | 24W (4 Ω) |
| Frequency characteristic | 25 Hz to 45 kHz |
| Input sensitivity | - |
| Damping factor | 45 |
| <Divider Section> | |
| Input impedance | 200k Ω |
| Maximum output voltage | 2.2V |
| Crossover frequency | 250, 500, 1k, 2k, 4k, 8 kHz |
| Decay rate | 12dB/oct |
| Signal-to-noise ratio | - |
| <General> | |
| External dimensions | - |
| Weight | - |