If all else fails, I’d check the transformers. Some are just noisy but it is inaudible when playing. My tube gear uses all Hashimoto transfers and we needed ‘pots” to drop the hum.
persistent 60 cycle hum only on tube gear
I know this topic has been addressed in the past but I'm hoping for the "latest tech" answer.
I have a persistent 60 cycle hum in my ARC tube gear. Not in my Bryston power amps or preamps- just the ARC tube pre and power amps. All XLR.
I have installed an isolated, dedicated ground system (8' copper rod driven into moist earth) , a Ground Master unit between the chassis and the ground line, I clipped the ground wire from my 20a 120v dedicated circuit, pretended to ignore the hum (that didn't work well). I even replaced the tube sets with ARC OEM tubes in the pre and power amps (sonic improvement but no hum cure) . Still the confounded hum.
Before I spend more money and failing I'd like your personal experience opinion on what worked for you.
Thanks!
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- 52 posts total
@OP As above, you don't want your amplifiers grounded separately to the rest of the system. Apart from that, does your ARC pre mum when connected to the Bryston power amps. If not, there is always the possibility of bad filter caps in the ARC power amps. But ground loops still remain the main suspect. |
@yoyoyaya : I posted my reply before I saw your post! Serendipity! Power supply caps are the Achilles Heel of audio gear. It is apparent when they start to die. |
- 52 posts total