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MicMix STUDIO B Master-Room spring reverb


Reverb equalization is provided through Q82, an OpAmp having equalization to establish low frequency response and with s81 and R86 forming the high frequency selection circuit. Up to 10 dB of peak EQ is provided at center frequencies of 1. 1, 2. 2, 3. 4, 4. 5 and 6. 0 KHz.

The Control Amplifier section consists of Q61 in a phase splitter circuit which is full wave rectified to provide both positive and negative currents to modify the OTA gain control stage. The output of this circuit boosts or cuts the OTA output gain to quickly cut off the reverberation signal (short time decay), or to amplify the existing reverb signal trail (long decay). The output of the Q61 stage is mixed through voltage divider R67, R68 and R69, with potentiometer R70 selecting the amount and polarity required for the effect desired.

NOTE: The decay control circuitry is gated by the output signal. This can cause operation of the reverb channel when the REVERB control is minimum (counterclockwise) and the DECAY control is also minimum (counter-clockwise).

This design provides greatest flexibility of the decay control for special effects when used with the reverb mix control but should be recognized by the user when such special effects are not desired.

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