My Krell FPB600 ran fine without the jumpers, with Aesthetix Io as preamp, no problem. But turning the preamp and let it stabilize before the amp is good practice.
Krell FPB 700CX
Krell FPB 700 CX wanting to use tube preamp. Jumpers are advised with caps being engaged due to "potential" DC. Based on the pics attached, the jumper above labeled JMP1 for tube preamps? Purchased used and Krell is under restructuring. Any help appreciated. Thank You.