UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Cretinous idea

Bookman · 12th Oct 2019, 7:27 pm

Going back to the original statement I would like to comment upon a not unrelated issue associated with my Musical Fidelity M3Si amp. In this I use the line out as the input on my Dynaco ST-70 valve amp but it creates a hum with power on to both units but with the MF3Si not yet switched on. It’s not a particularly loud hum but I dare not remove the cover to see if anything could be rearranged as it will compromise the warranty.
I contacted MF who responded suggesting I box up the unit and send it back to them at my cost as they were unaware of the reported issue. I decided instead to invest in a NAD 1020B preamp I saw on the internet; there is no hum whatsoever from that.
Joe

12th Oct 2019, 7:27 pm	#25
Bookman Hexode Join Date: Aug 2017 Location: Taunton, Somerset, UK. Posts: 318	Re: Cretinous idea - The combined volume pot and mains SW. Going back to the original statement I would like to comment upon a not unrelated issue associated with my Musical Fidelity M3Si amp. In this I use the line out as the input on my Dynaco ST-70 valve amp but it creates a hum with power on to both units but with the MF3Si not yet switched on. It’s not a particularly loud hum but I dare not remove the cover to see if anything could be rearranged as it will compromise the warranty. I contacted MF who responded suggesting I box up the unit and send it back to them at my cost as they were unaware of the reported issue. I decided instead to invest in a NAD 1020B preamp I saw on the internet; there is no hum whatsoever from that. Joe