Radial Engineering headbone VT issue

[skullfxr]

I have a Radial Engineering Headbone VT, Which is a switcher for two heads into one cab. I have the Promod and Quickrod hooked up to it, and there is clearly something that is wrong.

I triple checked the wiring, powered everything up, and when I have one amp on the Headbone makes a high relatively quiet squeal and no sound to the cabinets.

So I referred to the manual and tried the ground lift and then I could hear a 'singing' from the headbone while playing, and no noise from the speakers.

So needless to say I powered everything down and was like 'oh shit'.

I plugged the heads straight into the cab (completely eliminating the Radial unit) and thank God the heads are fine.

I did some Googleing and have heard of this on a few forums with high gain amps but not with much information in them.

Now, I have three of these units, and one works great between my Orange and Tremoverb, and the other works great with the Engl and the Framus.

So this one is bad.

Should I swap it around? Could I try to lift the ground on a head?

I did read somewhere that an ISO transformer between the second head and the unit could help.

I am dumbfounded.

Also it's worth mentioning that I got this unit off of Reverb as I did the other two. This may have been the first time I powered on the unit.

I will be calling Radial on Monday and see what they say.

All thoughts and ideas are appreciated.

 

[ericb]

I have a Radial Engineering Headbone VT, Which is a switcher for two heads into one cab. I have the Promod and Quickrod hooked up to it, and there is clearly something that is wrong.

I triple checked the wiring, powered everything up, and when I have one amp on the Headbone makes a high relatively quiet squeal and no sound to the cabinets.

So I referred to the manual and tried the ground lift and then I could hear a 'singing' from the headbone while playing, and no noise from the speakers.

So needless to say I powered everything down and was like 'oh shit'.

I plugged the heads straight into the cab (completely eliminating the Radial unit) and thank God the heads are fine.

I did some Googleing and have heard of this on a few forums with high gain amps but not with much information in them.

Now, I have three of these units, and one works great between my Orange and Tremoverb, and the other works great with the Engl and the Framus.

So this one is bad.

Should I swap it around? Could I try to lift the ground on a head?

I did read somewhere that an ISO transformer between the second head and the unit could help.

I am dumbfounded.

Also it's worth mentioning that I got this unit off of Reverb as I did the other two. This may have been the first time I powered on the unit.

I will be calling Radial on Monday and see what they say.

All thoughts and ideas are appreciated.

If you're definitely using good/proven cables with that Headbone, what I'd do myself is hook up 1 of the Headbones that works with those 2 Splawn amps, using the same exact cables you did before . If it works, then you know that Headbone is bad. Squealing would have nothing to do with a 'ground' btw. Good luck! Eric

 

[skullfxr]

I swapped two units the troublesome one and a good one and they BOTH worked fine.

So all of them are good but I don't know why. To me, that is unsettling. If something doesn't work I like to know why.

Well everything is working now. Huh.