This is in nearly excellent condition Pioneer vintage multi-voltage reverberation Amplifier SR-202. The reverberation amplifier is one of Pioneer's unique products. Unlike ordinary high fidelity systems that use single scatter systems, the SR-202 employs a double scatter system involving the merging and blending of two channels in a complex composite sound. The direct signals from the pick-up that have been fed through the preamplifier, and the reverberation signals, which are comprised of the signals of the opposite channels to which reverberation effects have been added, are merged and blended to result in a composite sound that includes echoes and reflected sounds. Two time delay circuits eliminate any peaks or dips in reverberation so what you hear is absolutely stable and has tremendous depth and brilliance. The SR-202 reverberation amplifier can be used to increase the naturalness of your own recorded voice, radio broadcasts, records or tapes. It can be coupled with your own system's amplifier (with tape monitor jacks) in various ways, to provide reverberation effects to the speakers only, or to just the recorded sounds, or both together. You can even control two tape recorders at the same time by switch operation for simultaneous recording, recording with reverberation, playback etc. In fact you can connect the SR-202 in practically any way you like for the effects you want. The system can be converted back to normal operation any time with the flip of just one switch. SPECS: Input level: 200mV (3V maximum) Output voltage: 330mV Harmonic distortion: 0.2% Frequency response: 20Hz to 35kHz Signal to noise ratio: 65dB Reverberation time: 1.9 to 3.2s Dimensions: 300 x 115 x 250mm Weight: 4.0kg Semiconductors: 11 x transistors, 2 x diodes