3.3 Level adjustment
Adjust the software parameter. The measured adjusted value is stored to the memory of MGH-
106A.
3.3.1 Environment measurement
For measuring the output of LINE OUT L, prepare one of the following environments.
•
The mixer with level meter
•
Connect the phone plug to the input of the multimeter or the AC voltmeter
*The measurement error tolerance of the AC voltmeter is under 0.01V when measuring
the AC voltage 0.5V.
3.3.2 Preparation
1. Remove the expression pedal or set expression value to the maximum value.
2. 2. Turn o
ff
OVERDRIVE, EFFECT and UPPER VIBRATO.
3. 3. If LEVEL on TUBE CALB2 screen is changed at bias adjustment, reset it to 5.
4. 4. Press
✄
✂
'
✁
▹
button and enter to TUBE CALB1 screen.
3.3.3 Adjustment
1. Set SEL to 12AU7 1.
2. Set the SEN (SEND) value to 100.
3. Set BYP to ON and adjust MASTER VOLUME or the mixer volume to make the level
easy to understand as the reference.
4. Set BYP to OFF and adjust RET value to make it to the same level as it is ON.
5. For the other channels, adjust the RET value to make it to the same level.
For the SEN value, set to 100 for 12AU7 and set to 80 for 12AX7.
6. Press
✄
✂
'
✁
▹
button until exiting TUBE CALB1 screen and finish the adjustment.
*The adjusted value of SEN/RET is stored even when the power is turned o
ff
.
3-8
