Studio Electronics Boomstar Modular Amp

The amplifier (AMP) is a 2 stage Class A discrete design using 3 pairs of hand matched transistors. Envelope is usually applied to ST1/1. ST1/2 goes thru an attenuverter and can be used for envelope or modulation. ST2/1 goes to the 2nd stage, and is typically used for volume control. ST2/2 goes thru an attenuverter and is typically used for modulation. The AMP, the 5089, and the 3003 are Class A circuits. They draw more current from the +12 rail than from the -12 volt rail. If the system power supply is under-sized, hum or buzz may be heard. In that case, larger filter capacitors and/or a larger power transformer will be needed. The 4075 draws equally from both rails, and is more immune to hum. Like our filters Boomstar Modular AMPs are hand-built entirely in the U. S. of A—just ask Rachael Herbison!

All Controls and Patch Points

• INPUT – Adjusts the audio input.
• ST1 CV2 – Adjusts stage 1, control voltage 2.
• ST2 CV2 – Adjusts stage 2, control voltage 2.
• DRONE – Sustains the last note received.
• DRIVE – Final output stage overdirve/saturation.
• OUTPUT – Adjusts the audio output.
• INPUT – Audio input.
• ST1 CV1 – Stage 1, control voltage 1 input.
• ST1 CV2 – Stage 1, control voltage 2 input.
• ST2 CV1 - Stage 2, control voltage 1 input.
• ST2 CV2 – Stage 2, control voltage 2 input.
• OUTPUT – Audio output.

Vitals

• Size - 8hp
• Depth - 39.7mm with ribbon cable attached
• Power Usage - 35mA, 12mA (+12 / -12)