Hi guys . As an old owner of 2301's I have this , let's say uncertainty , my c2301 gets really warm after a couple of hours working, specially during summer. It is a 220v German version. I had it running on 230vac , and I thought that could be the problem. Recently I modified a big voltage regulator to act as fixed multi output transformer by reversing the cabling and taking the servo mech out of the way . So my c2301 now runs on 220vac. Still gets warm. Even the transformers get warm after a couple of hours. I mean warm like 50 degrees centigrade on the top cover. Inside it's more like 55 or even 60. Off course all pcb's are closed , or encapsulated on aluminum boxes to reduce noise , so some of the heat comes out of the venting holes from those. But in general this preamp runs warm. Anybody else here noticed the same behavior?