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terrible hum need help

hi my name is paul miguel
im having trouble with my akai cr-80 8 track player recorder, it has a terrible hum on the left channel, right channel is fine. i recap it replace transistors i even swap the ics thinking that maybe the hum will swap too but it did not maybe some of you here had encoutere this problem

thank you
paul



Re: terrible hum need help

Check the wiring at playback head (broken connection) as well as resistance of the head coils. While very rare, an open head winding can result in tremendous hum.

Re: terrible hum need help

You could have a poor ground connection in the pre-amp or amp stages.

Re: terrible hum need help

thnx Johnnysan all grounding pt are good even the record switch is perfectly fine

Re: terrible hum need help

Did you check all the soldering on the RCA jacks?