Reply To: BM 6000 (Type 2252) – constant hiss on one channel

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Yes, it could be a broken ground connector or track on a board, broken solders.

When all sources have this problem, it is inside the (pre)-amp.

If possible and if the preamp can be disconnected: apply a different source carefully to the amp. If gone, it’s the preamp. If not, the amp.

If it is more a 50Hz humming sound: defect power source, dead caps.