I have owned a HD100 Mk II for a little over a year now and I am having problems with it for the second time. The first occasion the amp would run but there was no sound. I sent the head back to Line 6 and the motherboard was replaced under warranty. It was explained the stock motherboards were faulty in the early Mk IIs.
This evening I have run into my second issue. I turned it on and got low volume from a clean channel. Moments later, a very loud distorted feedback began to ring through. It was at piercing volume and even after turning the volume all the way down, the amp continued to scream and buzz. I put the amp in stand-by mode to relieve my ears and turned to my computer. All of the sudden it began to scream and buzz even in stand-by mode.
I am not sure what is causing this. Immediately I assumed tubes but given the problem persisting in stand-by mode, this must be something else. Any suggestions out there?
I think I should have gone with a Marshal stack and Line 6 pod vice the SV. Apparently there is too much going on with a Line 6 head to function reliably. Now outside the warranty, I could use some help before dropping cash on tubes and techs to tell me Line 6 will have to fix it.