-17-
Tube Adjustment Specification
1. Overview
This specification describes the method to adjust differences due to characteristics of
tubes.
2. ACCELERATOR (Input side) adjustment
There are two methods of adjustment. The first is the adjustment that only the
ANALOG PCB is used for, and the second is the adjustment carried out after the unit
is assembled. Choose the method which is convenient methods as the case may be.
2.1 In the case of adjust only the ANALOG PCB
2.1.1 Measurement system
Connect the ANALOG PCB and measurement equipment as below.
● Connect the ANALOG PCB and TUBE-ACC PCB
(CNA_ACC-CNB_ACC).
● Connect CN7B, CN401A, CN402B, and CNA_ACC_TUBE to the
measurement jig with harnesses.
● Connect to GUITAR INPUT (J200) on the ANALOG PCB and an
analyzer or an oscillator.
● Connect an analyzer to ANALOG PCB and the measurement jig.
Don’t connect harnesses which are not described because they are needless and may
encourage to mistake.
Refer to figure 1, figure 2, and figure 3 for details.
D166 ANALOG PCB
Oscillator
or
Analyzer
jig for D166 ACCELERATOR adjustment
AC
ADAPTOR
(AD-0012)
Audio Analyzer
CN7B
CN402B
CN401A
CNA_ACC_TUBE
TP5
ACC
ch2
J200
GUITAR
D166 TUBE-ACC
CNB-ACC CNA-ACC
ch1
Figure 1 block diagram of measurement
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