AC-20 amp model producing a lot of hum??

[Gene]

Hi, I am making a country guitar preset based on the Morgan AC-20 model and the AC-20 cab.
When I use the amp model it produces a large hum. I have a new CLR mk II a few days and I thought it had developed a fault but lucky for me it only seems to be the AC20 models that bring on the hum. I tested other amp models and none of them are producing this kind of hum.

Turning off the power amp sag gets rid of the hum as does switching the power type to DC

Is this the way the model is or is it a bug do any of you know?

Thanks.

 

[yek]

Nothing wrong with the models. Note that the AC-20 "Bass" models produce really a lot of low end.

Did you try resetting the Amp block and them selecting the model again?

 

[Gene]

Hi Yek, sorry for the late reply. I lost track of time there wiring a studio outboard rack (it's 2am here). I'm using the treble 12AX7 model. I loaded it and all the AC-20 models few times and tried twin, AC30, Dr Z etc but only the AC 20 produced the hum.
I'll try resetting amp block tomorrow. It's probably something simple . It's a nice amp model the AC20.
Thanks for your reply.