Question about Audio Players & Recorders

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There are a number of possibilities.

First, get an outlet checker from the electrical department of a building supply store (for the US electrical systems, it has three neon lights indicating normal, open ground or hot and neutral wire reversal). If one of the outlets you are using for your audio equipment is not properly wired, it could cause hum.

Second, disconnect external input devices one at a time (CD players, TV sound, cassette decks, etc., but leave the speakers connected). If the hum goes away with one of those devices, it may have a problem with ground isolation. Post back if you find this, and include brand and model number. If the hum goes away with the very last piece of equipment, and comes back with something else connected again, or is present with two particular devices connected, post back with details of the devices and how they are connected (both signal cables and power).

If the hum is still present with all input sources disconnected, it's time to check the power supply inside the receiver for failing capacitors or other defects.

Posted on Jan 03, 2011

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What sources do you have connected to the receiver? The thing to do is to disconnect your sources one at a time and see if one of those eliminates that hum.

Posted on Jan 03, 2011


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I am not an expert in the repair of Akai units- most of the time I refuse them, however just to put you on the right path, the hum is coming from a power supply issue in the record audio section or may be in the bias section. You may need to put new Electrolytic caps in the power supply to resolve this. You can also scope the supplies on this deck to find the cause. I commonly work on Teac, Pioneer, Otari, Studer, Sony and better made decks. Some brands are real trouble and are more costly to repair due to poor construction.
I have been doing repairs for 40 years so far.

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Technics M14 cassette deck has hum. Bought used and had hum but I got it to go away by switching the tape select dial to metal,etc. but hum came back later. I'm thinking ground or a wire to that switch. ...

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Determine the conditions present whenever the hum is present:

Player just turned ON?
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Tape deck Recording or Paused?
"Tape" selected at the receiver?
Any source selected?

What switch are you referring to? You could have a floating ground or shield through a Tape Monitor or other control. Audio cables between the Deck and the receiver could be faulty or require reseating with a twisting motiuon to remove oxide build-up.

Hum can enter any unshielded cable running near any motor, magnetic field or some light sources. Sometimes simply reversing the polarity of an AC power cord will cure it.

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You might also want to check for poor amp earthing. Normally moving close to, or touching, the front panel will reveal this problem as hum will reduce dramatically.

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How does it sound when you just play straight vinyl through your system? If you still get that hum, issue might also be faulty RCA cables, and even cartridge. So you would need to test everything out.

You don't really need a pre-amp unless you are connecting straight into your pc from your turntable. In that case, yes you will need a pre-amp, and this actually might be the cause of everything. If you are going into a DJ Mixer or a receiver, and your turntable is connected to the PHONO INPUT connection, you do not need a phono pre-amp.

Here are some inexpensive PHONO PRE-AMPS.

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