Thanks all. I called ARC yesterday and they are due to come back to me later. They asked me to check if the resistors nearest the last tubes looked burned out but they look fine. With the new tubes in the ref 3 and this 110 it sounds fantastic - cant believe what I’ve been missing but I guess there’s a problem I need to fix. I’m waiting to hear from ARC whether I’ll cause damage by using it like this.
In the UK I only have to take it 40 mins up the road to the UK importer but fear they’ll have it for weeks!
Not sure its something I should try and fix myself.