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Have a reel to reel tape recorder that has a bad Hum in playback mode. What could cause that?

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  • Robert Hunt Jun 12, 2012

    Can you hear the hum in both channels? If not, then the problem could be somewhere else.

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Most hum is caused by a faulty electrolytic capacitors. If the hum is accross both channels, then it's most likely one in the power supply part. Maybe the big one that filters the 50/60hz mains hum. The reason you will hear it in playback, is that a switch will be opened up when the mechanism goes into play. This switch connects the tapes pre-amp to the audio out circuit.

Posted on Jul 14, 2010

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I can't see this question answered anywhere. There is information for fixing hums on bother the Mk I and Mk II models of the Akai 4000DS here:



http://electronicaid.webs.com/

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[2] many tape recorders use rubber belts and pulleys to turn the feed reel and the takeup reel. If the tiny rubber belt that makes the take-up reel turn is stretched, it will not wind moving tape fast enough, which causes tape to bunch up. If this is the problem (you will not be able to see the belts without removing the recorder's outer case), then you might as well junk the recorder.

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An associated problem is if the reel sensor is intermittent- this sensor tells the logic whether or not the takeup reel is turning- again, this is to avoid massive tape spillage and damage.

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