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On 1950s-60s twin valve amps in record players two questions how do you stop the loudish hum and how do you increase the volume. Thanks.

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The hum is because of bad capacitors in the power supply area. Many of these have caps in the large silver cans. Replace them using standard electrolytic caps and the hum should go away. Once that is gone, the volume should return as well.

Dan

Posted on Aug 28, 2008

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I have a Kenwood KR V6090 tuner amp. Can anyone please tell me if I need a record deck with or without a pre amp fitted.


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Hi i have a kenwood system which has a loud hum/buzz over the vol this is louder on radio basically unable to hear any music / speach the hum also is on all other selections cd tape aux record deck mo


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I have a pioneer xc-is21v .basically 2000 audio model which has a vcd player and amp with woofer . i get a humming noise in the speaker but not in the headphones pluged in amp.this is a low ?60hz hum...


It may be that your headphones just don't handle that frequency well enough for you to notice it. A hum at this level could be due to earth(grounding) problems caused by a double earth. If you have other devices (tv, laptop, CD player, games console and the like), plugged into your amp try unplugging them one at a time to try and identify the source of this hum. (I get this occurring with hum on my television if I leave my laptop plugged into my audio system - which the TV is also connected to - even if the audio system and laptop are powered off).
If this resolves the problem you may need to insert a ground loop isolator device between your amp and the device that is causing the problem.
Although this one (on sale in the UK from Maplin) is designed for car audio systems I use it on a public address system to eliminate ground loop hum on the stage fold-back amps. http://www.maplin.co.uk/ground-loop-isolator-33172

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I Know The speakers work because the radio and tape player are fine. The records, however, you can only faintly hear on full volume. I followed the instructions about removing the plastic shield from the...


Hi Kathy, record players put out a very low level signal, you need a phono input stage for the amp to handle this input. If your amp does not have a phono input, many new amps do not ( check your instruction manual) .. then you will need to buy a phono pre amp which will match the record player to your amp. You can get this from your dealer.

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The humming comes from the speakers and is very low and doesn't increase with the volume.It doesn't really bother much, just during quite times of a movie.


does the hum comes in all input? if yes, check proper earth gounding from wall outlet and if ok check filter capacitor in the power supply circuit. If not in all input, check hook up wire for that input causing the humming noise, could be a bad hook-up wire only. Thanks :)

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Hey Tex

You are on the right track, sounds like a noisy volume control. Can often be repaired with a squirt of cleaner spray into the potentiometer assembly.But I suggest you use crc2-26 contact lubricant spray, not silicone spray which is a great materials lubricant, but not electrical. Worst case, the Vol Potentiometer, may have to be replaced. Go for the CRC first and see how it goes. Good Luck, happy FixYa

regards
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