bhuskins
Super Member
I've got a nice C-1 preamp that works great on the all the inputs except the 3 phono inputs which have a noise issue in the left channel. The right channel is like you'd expect it...nice and quiet when nothing is connected. A slight hum at high volume but that would go away once a table is grounded to the input. The left channel has what I suspect is a noisy transistor(s). That typical scratchy and hissy sound bad transistors make. The meter also shows this noise in that channel and the noise follows the controls if you reverse L and R or combine, etc. All 3 phono inputs exhibit the same problem. I'll likely go through the entire unit eventually and fully restore it, but for the short term I'd like to resolve the noise in the left channel on the phono section. Any advice on what board/section/part(s) I should focus on to get this unit working properly?