Ewan Aitken Posted July 9, 2019 Share Posted July 9, 2019 I'm a sound engineer but have also been a bassist for nearly ten years, got the ampeg pf50t for my 21st last year and have been using the two XLR outputs for the Di and preamp, the tone is absolutely amazing this way but I do keep hearing a very fair high pitched whining when I'm using it, I'm using a berhringer audio interface and I can't figure out the issue, anyone in the same boat Quote Link to comment Share on other sites More sharing options...
Beer of the Bass Posted July 10, 2019 Share Posted July 10, 2019 The DI outputs on mine don't have this noise, so I don't think it's normal for this model. One thing that did occur to me though - one of the preamp valves in mine became microphonic, which can cause a high pitched ringing. Does your noise vary if you gently tap each preamp valve? (you can do this through the cage with a wooden cocktail stick). If you hear loud ringing when doing this, that valve may need to be changed. If you're using both DI outputs simultaneously into the interface it could also be a ground loop issue, in which case the ground lift switch on the amp should help. It would also make the issue a little clearer if you let us know if the noise is heard through the speaker or just on the DI outputs and whether any of the amp controls affect it. Quote Link to comment Share on other sites More sharing options...
Ewan Aitken Posted July 20, 2019 Author Share Posted July 20, 2019 Both, my friend thinks if could also be dirty power from the mains Quote Link to comment Share on other sites More sharing options...
Ewan Aitken Posted July 20, 2019 Author Share Posted July 20, 2019 More obvious through both di Quote Link to comment Share on other sites More sharing options...
Chienmortbb Posted July 23, 2019 Share Posted July 23, 2019 To be honest power in the UK is fairly clean. Your DI should be able to reject any power noise. Quote Link to comment Share on other sites More sharing options...
Ewan Aitken Posted July 27, 2019 Author Share Posted July 27, 2019 Thing is it's in my cabin and it's taking power from the house and the power to the cabin runs under the ground so I suspect it might be unclean power Quote Link to comment Share on other sites More sharing options...
bazzbass Posted July 28, 2019 Share Posted July 28, 2019 my money is on the Behringer I use their headphone amps and they are great, but still, I think it's the Behringer Quote Link to comment Share on other sites More sharing options...
Ewan Aitken Posted July 28, 2019 Author Share Posted July 28, 2019 flipkkkk Quote Link to comment Share on other sites More sharing options...
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