Hughes and Kettner
Hughes & Kettner Red Box Pro DI Direct Guitar Speaker Cabinet Simulator Cab Sim
Has been tested and works perfectly.
The H&K Red Box is a small DI box that takes your amp's speaker signal as its input, and converts it to a balanced line-level signal to send to your PA or recording mixer. Since the signal is post-power tubes, you get all the tubey goodness in the sound, unlike many Line Out signals.