So I just hooked up my new HX Effects and Victory V30 MkII rig, and found I had a lovely ground hum.
After some googling, I found that cutting the ground on the cables going to the FX loop, at the HX end should do it. No luck. So then I read cutting the ground on the TRS footswitch cable I was using should do it, and sure enough it did. Ground hum gone.
Question now is, should I reconnect the ground on the FX loop cables, or am I cool to run them without? What's the deal with running them with/without the ground connected, at the HX end?
Thanks
Comments
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
If that's a problem, you can fit resistors - 10-100 ohm is usually about right, it's not critical. (I know you know that already .)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Lack of a complete shield can make the system prey to RF Interference. Phone twitter is pretty penetrative.
The fix is to complete the earth path with a capacitor. 1nF is ideal but hard to get inside a standard jack plug so look for some very wee ceramics 63V working is easily enough. Note tho' that mob phone will still get through if you have the taps wide open.
The other downside is that you now have non-standard cables and so MARK the fellers up!
Dave.
When I made isolated output switchers I had a 3-way switch for the ground on the isolated output; completely isolated, tied back to main ground, or linked with a 15 ohm resistor. From the feedback I got those three gave at least one hum-free option with any setup.
What I never worked out was why linking the grounds sometimes resulted in the least hum.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein