Ada MP-1-CHANNEL User Manual page 2

The ADA MP‐1‐CHANNEL is designed for the guitarist who wants the authentic tone of the
renowned MP‐1 MIDI TUBE PREAMP in an effects pedal enclosure. The MP‐1‐CHANNEL uses
the same vacuum tube design of the rack‐mounted MP‐1 PREAMP of the late 1980s to
accomplish this goal. Two 12AX7 vacuum tubes create the tone – VOICED as CLEAN and
DISTORTION for smooth warmth or sparkling definition to responsive overdrive and high‐gain
distortion. The signal is then passed through the ADA tone stack for shaping and harmonic
emphasis.
The MP‐1‐CHANNEL pedal has a True Bypass foot switch and runs off a standard 12‐volt AC
adapter. Inside the MP‐1‐CHANNEL the voltage is increased to 270 volts to obtain the best
performance possible from the 12AX7s. Unlike the original MP‐1, the MP‐1‐CHANNEL is not
MIDI programmable, not stereo and has no chorus effect. The MP‐1‐CHANNEL is a single
channel, mono pedal.
POWERING UP
The best way to power up the MP‐1‐CHANNEL is to set the POWER switch off, plug in the AC
adapter (ADA part number 240005) or pedal board power supply (12V at 800mA), and turn on
the power supply, but not the MP‐1‐CHANNEL. Then set the MP‐1‐CHANNEL POWER switch
on. The vacuum tubes require a lot of current to stay hot, and some power supplies cannot
provide this. We recommend the ADA AC adapter because some generic AC adapters will
"shut down" for protection and cause the MP‐1‐CHANNEL POWER LED to flash a few times
before staying on. This does not cause any damage, but can be a bit annoying. After the tubes
warm up, the guitar signal is passed to the OUTPUT jack.
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