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Hi, all. Just bought a very clean and presentable Cambridge audio P40. Bought as spares repair. Plugged it into the lamp limiter and all was good so braved it at plugged it in and hooked up some speakers. Basically, it’s working but there’s an issue with the sound balance between left and right channel.

The first thing I noticed was that the volume pot seems way to sensitive. By this I mean that from 0, it goes really loud as soon as you turn it. It is graduated though. Second thing I noticed is that the right channel doesn’t become audible until volume is turned up a bit. This is regardless of which position the mono/stereo selector switch is in.

Next thing to note is that’s the balance pot doesn’t seem to do much at all. I can hear a shift it left /right bias when I turn it fully either way but it’s barely noticeable and when turned all the way, it doesn’t mute the opposite channel.

Other than that, it actually sounds pretty good. Only paid £30 and it’s in lovely cosmetic condition. In my opinion it’s a lovely looking amp and it seems very well made. it’s really heavy for the size. Looking inside it doesn’t appear to have messed about with.
I believe it’s from the late 60’s/early 70’s which would make this the mk1.

Any pointers would be greatly appreciated. Haven’t been able to find a wiring diagram either so if anyone has one that might be handy.

Thanks.