Linus27 Posted June 10, 2009 Share Posted June 10, 2009 I've just bought a brand new Ashdown ABM 500 Rack mouted EVO III Head. With the speaker connected but volume up, its as silent as a mouse. As soon as I plug my cable into the input socket, it starts to hiss. If I turn the treble dial up the hissing becomes much louder. If I turn the valve blend dial to add more valve, the hissing becomes much louder. I have tried 3 basses and its exactly the same with each bass. I have not tried a different cable yet but it is a brand new cable. I will try a new one to elimate this option. Does anyone else have this head and notice a hissing noise when a cable is connected to the input socket? Quote Link to comment Share on other sites More sharing options...
Buzz Posted June 10, 2009 Share Posted June 10, 2009 New preamp valve needed perhaps? If it affects all 3 instruments it's either the cable or something in the pre. Try a cable first ofc. Quote Link to comment Share on other sites More sharing options...
peted Posted June 10, 2009 Share Posted June 10, 2009 I would suspect the cable if the head is silent until it's plugged in. How is the hiss with no cable, and the valve drive + volume at full? Quote Link to comment Share on other sites More sharing options...
niceguyhomer Posted June 10, 2009 Share Posted June 10, 2009 I have the older version - no hiss at all. Give them a call at Ashdown - they're really helpful. Quote Link to comment Share on other sites More sharing options...
iamapirate Posted June 10, 2009 Share Posted June 10, 2009 I reckon preamp valve. The input would have a cut off so that the valve isnt being used and there would be no output if there was no input cable connect, ehich is why it doesn't hiss without it in. I'm just guessing here, I really don't actually have a clue. Just an idea Quote Link to comment Share on other sites More sharing options...
Linus27 Posted June 10, 2009 Author Share Posted June 10, 2009 [quote name='peted' post='510275' date='Jun 10 2009, 03:37 PM']I would suspect the cable if the head is silent until it's plugged in. How is the hiss with no cable, and the valve drive + volume at full?[/quote] With the valve dial on full and the input and output on full with no cable attached it is silent. With a cable plugged in, the valve, input and output set at 9pm, you can hear a hissing sound. If I turn the valve to full, or increase the treble dial, the hissing gets louder. I have tried different cables and there is no difference in the hissing sound Quote Link to comment Share on other sites More sharing options...
Stephan71 Posted July 30, 2009 Share Posted July 30, 2009 Hello Linus, I have the same head and the same problem. I've described this problem to ashdown, and ask them for the acceptable limit for hiss, but have not recieved any answer, yet. Next week I will test this Head in our local music shop (ashdown dealer) to ask them for their opinion. I think the hiss is too loud. I wonder, if this would be covered by the warranty.... Have you got any progress on this issue ? Regards stephan Quote Link to comment Share on other sites More sharing options...
Linus27 Posted July 30, 2009 Author Share Posted July 30, 2009 Hi Stephen, In the end, I had no problem with the head, it was something I was doing. I was testing it with the bass not connected to the cable. With the bass not plugged in, the cable then becomes an antenna and this amplifies the hum. I was testing it with the bass not connected to the cable but OBMN informed me this is not the correct thing to do. So in the end, there was no fault with the head. Quote Link to comment Share on other sites More sharing options...
woolz Posted August 2, 2009 Share Posted August 2, 2009 these heads to hiss a bit when you swicth the EQ on. nothing you can do really Quote Link to comment Share on other sites More sharing options...
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