Dear Sir/Madam, I recently bought a second hand integrated amplifier, the Sony TA-F700ES. It gives a wonderful amplification. It works 100%. Only I find a slight mechanical vibrational sound coming from the audio transformer. I don't know if this is normal. I took a look inside and saw some brownish "rust like" substance partly covering the transformer, is this a bad thing? If this is an indication that my transformer is no longer 100%, could you supply me with a new one? Thank you, Gijsbert Bakker

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