CCV Hum

[tims210]

I'm trying to troubleshoot a hum that recently appeared regarding the loop's operation. I recently bought a reverb/delay combo pedal to use which worked fine with the amp. I started noticing a hum develop after a while and thought maybe the pedal went bad. I was also using speaker cables to connect it which I've read can create noise. When I turned the loop off the hum disappeared. To further investigate, I removed both cables from the loop, jumped it with an instrument cable, and turned the loop back on. Now dead silent. I went and turned the loop off and the hum returned. It's like it's behaving in the inverse of when the pedal was plugged in. This is happening with both the jumper cable plugged in and also with it removed. Also happening on both channels. Tried a different guitar and cables too and no difference. Can anyone lend a hand on what might be going on here? I don't know what era my amp is. All I know is that it has the upside-down PCB.

Thanks in advance.

 

[S̷͖͑m̵͎͂á̵̺s̸͚̈́h̴̬̑]

Is it a hum or a ground loop? Is it the mains? Does it go down when you turn down volume and up when you raise volume?

 

[tims210]

Not familiar with how to answer your first two questions, but yes, it increases with more volume.

 

[glpg80]

Tube buffered loop?

Could be a bad tube.

 

[311boogieman]

Not familiar with how to answer your first two questions, but yes, it increases with more volume.

Did you get this resolved?
Can you record the hum/situation?
Pics of the tubes/Tube layout?
How do you know PCB is upside down?

I'd clean the FX loop sockets and preamp tube sockets with Dioxit, or similar electronics cleaner.

 

[tims210]

I played around with it some more and realized it was only happening when on the low power setting. When I flipped the switch up to full, there was no hum after turning the loop off. Is this a power tube issue or something else?

 

[tims210]

Is it a hum or a ground loop? Is it the mains? Does it go down when you turn down volume and up when you raise volume?

I'm learning as I go. I definitely hear a 60HZ hum as well. It's not just the Cameron but all of my other amps as well. I have to do a process of elimination to find the source. It's not the guitar or cables, and all of my gear is plugged into one surge protector power strip. If the problem is dirty electricity, can anyone recommend a reasonably priced power conditioner that actually works? I'm seeing mixed reviews on some of the more common ones.

 

[311boogieman]

Not the expert on power conditioners so hopefully someone else can chime in. I probably need one myself, although my rig is fairly quiet. The only time I have a problem is if I'm on my strat facing my dual rectifier at the wrong angle. Then I get that that 60 hertz BS

 

[LP Freak]

Any change plugging straight into the wall?

 

[FourT6and2]

I'm learning as I go. I definitely hear a 60HZ hum as well. It's not just the Cameron but all of my other amps as well. I have to do a process of elimination to find the source. It's not the guitar or cables, and all of my gear is plugged into one surge protector power strip. If the problem is dirty electricity, can anyone recommend a reasonably priced power conditioner that actually works? I'm seeing mixed reviews on some of the more common ones.

I just listed both my Furmans in the classifieds. One is a power conditioner, one is a voltage regulator. No idea if something like these will solve your problem though.

 

[tims210]

No difference plugging int0 the wall. I was going to try a Furman PL-8 anyway.

 

[FourT6and2]

No difference plugging int0 the wall. I was going to try a Furman PL-8 anyway.

The PL-8 is just a fancy surge protector. Like one of these:

 

[S̷͖͑m̵͎͂á̵̺s̸͚̈́h̴̬̑]

Maybe you should just contact Mark Cameron and ask him to go over it with you. I am sure he would be happy to help.