I have a strange situation where I hear a constant background noise whenever I first power up my amp and take it out of Standby mode. The noise is a combination of a faint, high pitched squeal and a swirling, whooshing sound, like white noise and radio static with some movement to them.
However, if I briefly unplug the instrument cable to the amp's input and plug it back in, the noise stops and doesn’t come back ... until the next time I power things up from cold.
Basically, the noises show up whenever I first power up the amp from cold, and either:
To clarify further, moving backwards from the amp input jack to the guitar:
It is nice that there’s a simple workaround, but I’m curious if anyone has an idea what the root cause might be, or if it signifies anything serious in need of addressing?
However, if I briefly unplug the instrument cable to the amp's input and plug it back in, the noise stops and doesn’t come back ... until the next time I power things up from cold.
Basically, the noises show up whenever I first power up the amp from cold, and either:
- With the instrument cable already plugged in when the amp is first powered on.
- With the instrument cable plugged in after the amp has warmed up.
To clarify further, moving backwards from the amp input jack to the guitar:
- The instrument cable from the amp is plugged into a passive TRS passthrough module on my Emerson pedal board.
- It is then connected to a series of pedals, all powered by Strymon Zuma power supplies.
- The Zuma power supplies are plugged in to an Emerson power module, which has an IEC cable to my voltage regulator/power conditioner and wall outlet.
- From the tuner input is an instrument cable connected to my guitar of choice.
It is nice that there’s a simple workaround, but I’m curious if anyone has an idea what the root cause might be, or if it signifies anything serious in need of addressing?