Additional advice is appreciated. Just to clarify, when I placed the Chase between my source and connected to the Luxman main-in, the sound was audible from my speakers, but the volume level was very low and could not be adjusted up or down. Everything else on the Chase worked: balance, treble, bass.
I don't want to use a simple potentiometer for volume adjustment as it would degrade sound quality, and I have learned how amazingly good the 19 year old Luxman amp sounds. When I use my Audio Research Reference 3 preamp or connect the Luxman directly to my PS Audio DirectStream Dac, it makes me wonder if I should look into a newer model Luxman.