Hi!

I got an old SONY amplifier where the right channel seems to be
defective. When I turn the balance to the right speaker, the volume
gets lower and low frequencies are missing completely. I am really not
sure, where I should start searching for the error. First I tried
another pair of speakers, but this was not the cause. Can anyone tell
me where I should start searching for the error? Can anyone tell me
what the integrated preamp (I found this on the schematics) is good
for?

Thank you,
arvid puschnig