In not sure on this but it may be difficult to find a tube integrated that is truly dual mono? If you are talking about two power transformers, two power supplies and then the output transformers your talking about a heavy piece of gear. If they have chokes in the supplies even more so. You may want to think about mono blocks and a dual power supply preamp? Someone may be able to help you, but nothing comes to mind for me as far as an integrated goes?
