Krell Fpb 300 engage capacitor for tube preamp

You don't have to use the jumpers, the problem was with a certain model bat preamp that put out too much DC. Most tube preamps don't do this.

Sorry for the Hyjack.  My last post reminded me or my time with Krell. I had an FPB 200 with Thiel CS6's with an Adcom GFP 750 pre and digital front end.  What a combination, WOW for Rock and Pop, yet it glared at me with Classical.  So, I got a California Audio Lab's tubed DAC. Oh, I became a tube lover from the first push of the play button.  Then came my first tube pre-amp and I became a tube "Slave".  Many years later, I have two systems, 200 miles apart: twice a year gear; VTL 450MKII's, B&W801S3's various front end gear.  I live "Off The Grid" with a Tubed Integrated Amp and tubed phono stage, DAC.  All those years and it's because of those jumpers on the internal right and left side, rear of that wonderful Krell Amp.