Nakamichi Pa-7 Nakamichi CA-5 Noise Problem Input

I'm not able to respond to the Cox Digital source but can in regard to a normal TV audio feed. My Nakamichi CA-1 (as well as all my former pre-amps) had severe signal noise with any source that had it's own amplification. I discovered that if I opened up the TV volume to maximum (while turning off the internal TV speakers) the line noise disappeared. So, I assume the problem existed in the poor quality electronics in the volume pot. Good luck!

I too had a similar problem. I floated the ground on the amp
(cheater plug) and the problem diminished. I also took two 75 to 300ohm transformers and connect to 300ohm sections together. that'll give you two 75 ohm f connectors to patch into your cable feed. This solved my problem. BTW this is a poor mans Magic Box & it works just as well & saves you $90.
Hope this helps.

Tim

You may be having a ground-loop caused by your cable. You can get an isolation transformer for it for a few bucks ($5 or $10) that will isolate the cable ground from the system but let the signal get through. Your tv service man can let in on the details.