Just picked up Krell 350 MCX amplifiers, Using tube preamp is Against its Basic design But krell includes Coupling caps just in case you have a tube preamp
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.
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.
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