I also have the same noise in the left channel of my 502B. I usually reduce this effect by re-biasing the amplifier when the noise gets too loud (or noticeable from the listening position). After re-biasing, the noise still exists but it can only be heard by approaching the ear to the loudspeaker. On the other hand, the right channel is absolutely quiet. I live in Spain and neither the provider nor the importer's technical service were able to give me a better solution.
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I have a Jolida Sj 502a and it has the same ploblem. I change the out put tubes without success. I thing is bad quality of some parts of amp. If you would find a solution, contact me. Vital [email protected] |