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Cary ph302 phono praemplifier

Hello, I have a phono preamplifier Cary PH302. It works fine but when I increase the volume control of the amplifier, noise appears in both channels. In the right 50 hz buzz, in the left background noise.
I changued the tubes, those from the left channel to the right, and those from right to the left. The noise changed channel, but it is the same.
I´ve checked the circuit and the components and it´s all good!
Anny suggestions?

Thank´s

Alberto



Re: Cary ph302 phono praemplifier

Bad tubes.

Re: Cary ph302 phono praemplifier

Hi Johnnysan, this comes factory equipped with 6SL7, what low noise tubes can you suggest?

Thank´s

Alberto