Built in
(1)Output transistor TIP42-4pcs
(2)2N5551,2N5401,C9015,C9014
(3)JRC4558IC,4052IC
(1)Output transistor TIP42 other parts are spoil
(2)Noisy sound about JRC4558IC at tone control circuit
(3)Radoi card always spoil and antenna 's broken
(4)Function buttons are dirty ,can't contact after using afew months
(5)Display screen spoil 70%
(6)Insulator which is using between transistors and headsink
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