3 Adjustment method of the vacuum tube
It is required bias and level adjustment when the vacuum tube is exchanged.
The parameters of the vacuum tube level adjustment is stored in MGH-106A, so when MXH-
40A, which is already adjusted the bias, is exchanged, MGH-106A is required to adjust the level
as MGH-106A is set accordance with MXH-40A.
3.1 3.1 Description of the adjustment screen
The method for calling screen is described in each adjusting method.
3.1.1 TUBE CALB1
For adjusting SEND/RETURN level mainly.
Parameter name
Contents
Value
Description of value
BYP
Output setting
OF
Vacuum tube circuit selected by SEL
ON
Bypass (not passing through the vacuum
tube circuit)
SEL
Channel selection
T1U
12AU7 1
T1X
12AX7 1
T2U
12AU7 2
T2X
12AX7 2
SEN
Send Level
0
ʙ
127
RET
Return Level
0
ʙ
127
3.1.2 TUBE CALB2
For setting the test output waveform
Parameter name
Contents
Value
Description of value
SEL
Channel selection
T1U
12AU7 1
T1X
12AX7 1
T2U
12AU7 2
T2X
12AX7 2
LEVEL
Test waveform level
0
ʙ
127
3-4
