P1ZZAPARTY Posted May 30, 2016 Share Posted May 30, 2016 Hey folks. I apologize if this is a simple fix but I am not too savvy yet when it comes to things like this. Last night we had a power surge that knocked out power for about 2 minutes. Today I decided to swap out the cartridge on my turntable that has been there for a few years before turning it on. When I flipped over to Phono on my amplifier (Yamaha A-S300) there was a very loud hum that was not present before the power surge and the cartridge swap. I unplugged my turntable (U-Turn Orbit) to narrow the problem down and the hum continued with the table unplugged. I know this doesn't eliminate my potentially-shoddy cartridge swap, because flipping the amp back to Tuner or any other setting eliminates the hum. I've never swapped cartridges before but I installed the new one (Audio-Technica CN5625AL) just like the old one (an Ortofon that came with the table) had been. Any advice on how to fix this issue would be greatly appreciated. Thank you so much. Quote Link to comment Share on other sites More sharing options...
Thomas³ Posted May 30, 2016 Share Posted May 30, 2016 Does it hum only on the phono input channel? Do you have another source to try (CD, tape, PC, etc?) It's very possible the power surged damaged the amp somehow. Quote Link to comment Share on other sites More sharing options...
P1ZZAPARTY Posted May 30, 2016 Author Share Posted May 30, 2016 It only hums on the phono input channel, yes. It also hums when all speakers are turned off and only headphones are plugged in. It also hums regardless of whether music is playing or not, as long as it is on and set to phono the hum is there. I watched TV via the amp earlier today (set to the tuner input) and it was perfectly normal. Quote Link to comment Share on other sites More sharing options...
NapalmBrain Posted May 30, 2016 Share Posted May 30, 2016 It could be a grounding issue, did the grounding pin just get knocked loose? Quote Link to comment Share on other sites More sharing options...
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