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Turtnable / Record Changer
Trouble Shooting for Hum















Question:©I am experiencing hum with a record changer that was recently given to me. Can you help?
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Answer: In regards to hum: Avoid placing the changer on top of an amplifier / receiver, as the magnetic field form the power transformer of the amplifier will feed hum into the phono circuit of the player, if not enough physical distance between the two. This issue can be examined when the amplifier is on and set to the input to which the changer is connected, with the volume up so that the hum can be heard. Then carefully lift the record changer away form the amplifier. If hum decreases then the magnetic field of the power transformer is the issue.
The RCA plugs of the changer should be firmly plugged into the input jacks of the amplifier / receiver to make proper contact. Sometimes the tabs of the plug may be bent, so that the plug does not insert all of the way - examine each plug and how it inserts into the jack. The outer ring of the plug should cover the ring of the input jack completely. A flash light may help to see.

Check if the turntable is connected to the right input. For example: Plugging the unit into the TAPE OUT will not work and cause seemingly strange problems.

If connected correctly to the right input, but still hum: This also raises the question, if possibly the amplifier / receiver may be defective.
Using the amplifier / receiver without the changer (open input - checking for hum), or plugging in a different device to the input to which the






changer was connected to, or to plug the changer into a different amplifier, may help to further trouble shoot.

The goal of trouble shooting would be to determine what the exact problem is, item by item examined, so that any potential issue can be detected and remedied, until all fully works

Question: My record changer hums and distorts - just does not sound right.

The record changer that you have is equipped with a ceramic cartridge.
This means: in order to sound right, it will need to be connected to a line level input, such as: AUX, CD, TAPE, etc. input instead of the "Phono" input. If hooked up incorrectly to the phono input: The cartridge of this changer outputs considerably more voltage than what will be needed for "phono", which means that noise and scratches are over emphasized and sound distorts. A phono input in addition provides RIAA equalization appropriate for a magnetic cartridge, which means: the phono pre-amplifier emphasizes the bass of the signal quite a lot, as appropriate for a magnetic cartridge. Magnetic cartridges have a different impedance and frequency response than ceramic ones. In other words: hook up to the wrong input may produce hum in addition to the other symptoms experienced.
Hook up to a line level input will remedy the situation.

2008 ultraelectronicactiv.com
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