Are you sure the lack of 'communication' is due to the pre, could it not be the remote?
repair or replace luxman preamp
1991 system, luxman tp 117 preamp, luxman dc 117 multi disc cd player, adcom amp, powering kef bookshelf speakers in small family room, and 3 rooms with luxman inwall speakers. Preamp no longer senses remote, limiting source selections. Repair or replace? Replacement rec? Thanks.