Pioneer SR-70
¥ 34,000 (around 1980)
Commentary
This reverb amplifier is equipped with a unique function to enjoy the echo effect and duet effect.
The normal echo is Effect 1, which produces the effect that the input signal is attenuated in a long-tail manner.
In Effect 2, after the input signal is reproduced, the same delayed signal is reproduced after a time interval (100 msec).
The reverberation time of the echo effect can be continuously variable and controlled from 0 to 3 sec by the Depth Volume.
It is a pure electronic structure using B. B. D. as a delay element.
Unlike the conventional spring-based reverb system, it is free from mechanical vibration shocks and maintains stable performance.
Built-in microphone mixing circuit allows mixing with sources such as records, tapes, FM, etc.
You can also reverb the mixed signal or record it.
A SEPP circuit is used for the buffer amplifier, and a dedicated IC is used for the mixing amplifier.
It is equipped with a reverberation effect indicator that shows the reverberation level with light.
Model Rating
| Type | Pure electronic reverb amplifier |
| Input Sensitivity / Impedance | 150mV/50k Ω |
| Output Level / Impedance | 150mV/1k Ω |
| Frequency characteristic | 5 Hz to 70 kHz ± 1 dB |
| Harmonic distortion factor | Not more than 0.05% |
| Signal-to-noise ratio | 87dB |
| Reverberation Time (Effect 1) | 0 ~ 3 sec |
| Delay Time (Effect 2) | 100msec |
| External dimensions | Width 420x Height 99x Depth 336 mm |
| Weight | 4.3kg |