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Luxman R-117 Hum

I purchased a Luxman R-117 and it doesn't have the jumper between the pre-out to main-in. I am using somewhat long RCA cables to jump. I have noticeable hum with volume all the way down. I am thinking it could be the cables fault (length) - if so can short RCAs be utilized? Also, there is overwhelming background hum when using either AM or FM tuner - worse on AM. Any help and advice appreciated.
Jim



Luxman R-117 Hum

Short cables took care of the general hum, but didn't improve the hum from the 2 tuner inputs. AM is unlistenable. Any ideas on the cause or suggestions of something I can try to do?
Thanks - Jim

Luxman R-117 Hum

Use short connectors.
There may be an additional supply problem.