Pop sound on left channel only.
Please advise should I replace the transistors in the driver circuit.

Many thanks.

Pls advise.

Even no signal source from tuner(not turn on) , there is still pop sound at left channel when turn on the amp.

其實有心攪，細粒果d晶體管換晒就最好，最小行信號果d一定要換。如果唔係裝好用一輪又有問題就又要攪過，當然電解電容最好都換晒佢，唔係左右唔同聲又係死。