1.
Connecting the negative pole of the multi-meter to
the zero ohm speaker terminal, and find out the test
point behind each KT88 tube.
Ne ga tive
Pole
Te st
Point
2.
Using a small screw-driver to slowly adjust the
adjust switcher, till the test voltage reach the
0.45V
H
L
Repeating the steps above for each power tube. Please
keep in mind for that the bias voltage of each tube is
best at same level.
Congratulation! You just updated your Jasmine Piano
KT88-PP Tube Amplifier!
Step Three: Adjusting Bias-Voltage of the Tubes