Krell 350 MCX Coupling Cap Jumpers

This is the first time I heard of restrictions using a SS amp with a tube preamp, is this specific to Krell?

Designer's decision! He didn't want the leaky coupling caps in a tube preamp (some vintage/boutique PIO caps tend to leak) damaging downstream components.

This is the first time I heard of restrictions using a SS amp with a tube preamp, is this specific to Krell?

Yes on all of those thanks!

@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.

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

Perfect.     Thank You

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.