The Hi-fi manufacturer Yamaha calls owners of some older amplifier models in November 2007 to get in touch. The devices pose a security risk. In extreme cases, there may be a small fire in the device. Yamaha offers free replacement of the affected capacitor via the dealer network. The following models are affected: Model A-760, A-760II, A-960, A-960II, A-1060, M-50, M-70 and also the B-6.