Krell 350 MCX Coupling Cap Jumpers

The red circles are the two coupling film capacitors, next to them are the jumpers (green circles). Removing the black plastic jumpers will activate the coupling caps.

Perfect.     Thank You

You shouldn't even need to use those if your preamp is working properly and you turn your system on in the proper sequence.

@invalid It’s a good precaution as the coupling caps on tube preamps DO go bad and leak. If the amp is otherwise DC coupled, even a few volts of leak (say 10v leak on a 400V preamp ) could be catastrophic.