https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/ Guitar Noise Discussion Board en-US Thu, 04 Jun 2026 09:26:29 +0000 wpForo 60 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118778 Fri, 19 Aug 2005 07:02:23 +0000 Guitar Repair and Maintenance JosephLefty https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118778 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118729 Fri, 19 Aug 2005 02:49:45 +0000 Guitar Repair and Maintenance Ricochet https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118729 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118724 Fri, 19 Aug 2005 02:13:24 +0000
If the cheap amps have filters, they are not designed very well.

I do understand rectifiers and caps resisting a change in voltage, inductors resisting a change in current but nothing like guitar amps. I work in a powerhouse....land of the giants there.]]> Guitar Repair and Maintenance JosephLefty https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118724 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118704 Fri, 19 Aug 2005 00:57:47 +0000
The power supply has a rectifier followed by several stages of resistance-capacitance (and in some cases, inductance-capacitance) filtration to drop the line frequency ripple to a tolerable level. Basically those are low-pass filters that won't pass the line frequency. Higher frequency noises on the line are attenuated even more than the ripple.]]> Guitar Repair and Maintenance Ricochet https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118704 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118688 Thu, 18 Aug 2005 23:51:54 +0000
Many of these noises come from the AC lines themselves. Home rooms are electrically split up to balance the house, usually 2 breakers to a room.

Sometimes the cause is something running in another room, like an old ceiling fan or other appliance.]]> Guitar Repair and Maintenance JosephLefty https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118688 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118655 Thu, 18 Aug 2005 22:04:14 +0000 Guitar Repair and Maintenance Ricochet https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118655 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118569 Thu, 18 Aug 2005 10:30:48 +0000
I'll agree with taking it back as long as its under warranty.

Joe]]> Guitar Repair and Maintenance forrok_star https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118569 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118381 Wed, 17 Aug 2005 17:40:08 +0000 Guitar Repair and Maintenance gnease https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118381 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118178 Wed, 17 Aug 2005 00:03:18 +0000 Guitar Repair and Maintenance Scholar https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118178 https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118001 Tue, 16 Aug 2005 05:11:38 +0000
You could try another room/another circuit to make sure it is not that circuit in the house before you take a trip. 8)]]> Guitar Repair and Maintenance JosephLefty https://guitarnoise.forum/guitar-repair-and-maintenance/real-bad-hummmm/#post-118001