Amp noise when isolated from guitar cab

[newamerikangospel]

I tried to search for this all over, but it may be too ambiguously worded. I just got a 50' speaker cable, to allow me to have my head in a control room away from the cab in a live room. I had my head connected through my countryman and was playing with impulses vs my mic setup on my cab. When I muted my channels I heard my amp making (audibly) an output of what I could hear my cab making, only very high high (8kish-above) coming specifically from the output transformer. Since I have never heard my head apart from my cab, I don't know if this is a normal occurrence.

 

[JakeAC5253]

Wow. That's very strange. Aside from maybe the cable length being so long that the impedance of the cable is becoming significant enough to cause this.

 

[anotherpaul]

I have the same thing happening both when playing with a speaker in another room through a long cable or when playing with a loadbox. I guess it's actually always like this, but these circumstances let the head sound be heard.
Enlighten us please, oh knowing ones!

 

[Nimvi]

Had this at some point too. Tried plugging things into different power sockets and it went away. I know waaay too little about power dispersion and ground loops but I'm pretty sure this is an anomaly caused by that.

 

[newamerikangospel]

I will play around with different outlets. I'm at least glad this isn't a sign of my output transformer going, since this isn't an isolated incident.

 

[B36arin]

I have heard that sound a few times when I or someone else has forgot to plug the amp to a cabinet. Thankfully I haven't blown anything yet.

 

[bryan_kilco]

newamerikangospel - I've seen you around here before. Did you used to go on the old LoG forums?

 

[newamerikangospel]

Yeah, the old school one from 2004 in various incarnations. I also hang out around the sevenstring forums.

 

[bryan_kilco]

Yeah man. I remember you. Been a while.... That forum is where I found out about this place.