Vacuum Tube Replacement - Ada MP-1-CHANNEL User Manual

8. Connect the OUTPUT of the MP‐1‐CHANNEL to the power amp insert jack or effects
return jack of your combo or head.
9. Set the POWER switch on the MP‐1‐CHANNEL to ON. In about 20 seconds the
vacuum tubes will warm up and signal will be available at the OUTPUT jack.
10. Turn on your combo or head.
11. Set your guitar volume knob to full and adjust the volume of the amplifier to a
suitable level.
12. Set the TRUE BYPASS foot switch to on, blue LED is on.
13. Slowly turn up the OD1 control. You should hear the guitar in your speaker.
14. Adjust the OD1 and OD2 for the amount of overdrive you want.
15. Adjust the BASS, MID, TREBLE and PRESENCE controls for the tone you want.
16. Adjust the MASTER for the volume level you want.
17. Switch the VOICING to DISTORTION, and adjust your MASTER for the volume level,
and make tonal changes using the BASS, MID, TREBLE and PRESENCE controls.
VACUUM TUBE REPLACEMENT
If you want to replace the 12AX7 vacuum tubes in the MP‐1‐CHANNEL, you must take the
bottom panel off. WARNING there are high voltages inside the MP‐1‐CHANNEL, so we
recommend a qualified service person for this task.
1. Unplug the AC adapter from the MP‐1‐CHANNEL and let it sit for at least 1 hour.
This will discharge the internal high voltage.
2. Remove ONLY the six screws shown in the photographs below. Note that one
screw at the lower center of the back panel has a lock washer. This washer and
screw must be replaced when putting the bottom panel back. Do not remove the
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