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Help - Noisy GT sm5

Discussion in 'Pro Audio Equipment' started by Beerco, Apr 5, 2009.

  1. Beerco

    Beerco Active Member

    Hi there new to the forum and was hoping to find a little help,

    I'm looking at buying a used Groove Tubes sm5 off a buddy of mine. He let me borrow it first to check it out and it's got a noise problem. The mike sounds fine but has a pretty low frequency noise pop type of thing that comes in every few seconds.

    Here is a link to a recording where the noise is very obvious: http://home.comcast.net/~ambirko/soundclips/Noisy Mic.mp3

    Does anyone have any ideas as to where this noise is coming from and whether it's something thats easily fixable?

  2. Beerco

    Beerco Active Member

    One more thing - I've tested two other condenser mics and they don't have this noise so it's definitely the mic and not the downstream devices.
  3. RemyRAD

    RemyRAD Well-Known Member

    Well, it's a tube. Assuming it's a tube? How long have you let it warmup? 2-3 hours is not unusual before any tube equipment warms up & simmers down. There could also be a electrolytic filter capacitor which have a tendency to age resulting in these types of noises. That could come from the tube power supply or internally in the microphone. But power supply issues are frequent issues.

    Ms. Remy Ann David
  4. Beerco

    Beerco Active Member

    Thanks, but it's actually a JFET preamp. There are a bunch of caps in there so that could be it though.

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