Quad 303 power amplifier hissing n pop sound.
I am a novice in electronic. Can some one kindly help me with this problem
My quad 303 when power up , 1 of the speakers ( right channel) has a hissing sound then a pop sound when power cuts in.It takes a few seconds to normalise.The left speaker is OK
a) replaced the 2 power supply capacitors from 2000 uf 200 V to Elna 3300 uf 100V and
b)replaced a single core to a multi cores cable from the rectifier to the + ve end of the capacitors and
c) connected in parallel .33 uf 1000vdc West capacitors to the out-put capacitors.
Prior to this change the 2 speakers were normal no pop sound etc.
My questions are :
1. What can likely gone wrong.
2. Can this phenomenon hurt the speaker.
3. Can the biasing cause this problem.
4. Does the polarity of the west caps matter . how to identify their polarity
1 end is silver and the other side is black in color.
Thank you and appreciate for any advice.