well, for the sake of discussion then......
I've a vintage Yamaha CA-2010 integrated which has a switch on the front to toggle between Class-A & "Normal" (which is Yamaha speak for class-AB). in class-A it is also a 30W/ch into 8 ohms just like donjr's Accuphase E-600. in my particular case, the amp's heatsinks (in the middle of the amp) become really hot. In the manual i read that the quiescent bias for the output stage is stepped up to 300mA in class-A while it is just 25mA in class-AB. The amp has no forced cooling & it is vented on the top + bottom + back. I suppose that Yamaha intended to operate with this sort of heat dissipation....
Could it be possible that the Yamaha's heatsinks are much smaller than the E-600's hence the higher heat??
The dimensions of the amp are quite similar to the E-600 & it's just 8-9 lbs lighter.
I've a vintage Yamaha CA-2010 integrated which has a switch on the front to toggle between Class-A & "Normal" (which is Yamaha speak for class-AB). in class-A it is also a 30W/ch into 8 ohms just like donjr's Accuphase E-600. in my particular case, the amp's heatsinks (in the middle of the amp) become really hot. In the manual i read that the quiescent bias for the output stage is stepped up to 300mA in class-A while it is just 25mA in class-AB. The amp has no forced cooling & it is vented on the top + bottom + back. I suppose that Yamaha intended to operate with this sort of heat dissipation....
Could it be possible that the Yamaha's heatsinks are much smaller than the E-600's hence the higher heat??
The dimensions of the amp are quite similar to the E-600 & it's just 8-9 lbs lighter.