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Sebatron Noise Issue - example attached

Discussion in 'Pro Audio Equipment' started by davewike, Apr 27, 2005.

  1. davewike

    davewike Guest


    I received my Sebatron VMP 2000e VU yesterday and I’m really excited about it. I have a Rode K2 on it’s way to take advantage of what the Sebatron has to offer. But in the meantime I’m just using this old Shure SM58 to play around until it gets here. I noticed something very alarming... a LOT of noise.

    Here are my Sebatron settings:
    Pad = 0
    Phase In
    Phantom Off
    output level = 1.5 to around 2

    My Mackie 1202 settings:
    Trim = 0
    Gain = U

    Room noise: minimal to none
    Mic cables: VTG Audio


    All this might go away when I get my Rode K2, but I just wanted to make sure so I’m not shocked when I get it and it’s still all noisy. My friend just got his sebatron and he doesn’ t have ANY noise... it’s amazing. I know it’s going to be great once I figure out what either I’m doing wrong, or what is wrong with the unit.

    Please advise.


    Here's the file:

  2. Markd102

    Markd102 Well-Known Member

    Dave... two questions.....

    Have you allowed the preamp to warm up for 30 mins?
    Is the noise in both channels?
  3. x-Greg-x

    x-Greg-x Guest

    dave and I have been trying to work out this issue together the past day or so. I bought mine about a week ago and made some recordings that sounded wonderful. Dave has the same noise in both channels. Also mine is clean from the second the switch is flipped. no warmup required although I hear they do sound better after about 30 minutes. The interesting thing about dave's unit is that the D.I. input seems to be noise free.
  4. Markd102

    Markd102 Well-Known Member

    It says in the manual that the valves will probably be noisy until they have warmed up.
  5. Kurt Foster

    Kurt Foster Distinguished Member

    Are you running the Sebatron into the Mackie channel line input / 1/4" input?
  6. x-Greg-x

    x-Greg-x Guest

    i assume you mean from the trs send? no. we used the xlr outs on both the mic in and the d.i.
  7. Kurt Foster

    Kurt Foster Distinguished Member

    .... and then it is running to what? The recorder? The Mackie channel strip via the 1/4" line input on the channel strip or the insert return ? Which is it?
  8. x-Greg-x

    x-Greg-x Guest

    xlr balanced out from sebatron direct to channel 1 on the mackie. Using XLR though not using 1/4" at all.
  9. Markd102

    Markd102 Well-Known Member

    Let me get this straight....

    Are you saying that you are using an XLR to XLR lead to go from the Seb output to a Mackie preamp?????? :shock: :shock:

    Man, you are asking for problems!!!!!!!!

    If you MUST use the Mackie at all, get a female XLR to male TRS lead and go into the line input.

    But I would be bypassing the Mackie altogether!
  10. x-Greg-x

    x-Greg-x Guest

    i must be confused or really wrong. please forgive me as I am a new poster. So could you explain why xlr to xlr is bad. Dave is running into a mackie vlz mixer like this and I am running xlr direct as well into my tascam fw 1082 which then goes into my mac. I didn't know this wasn't right. I dont use any of the gain on the tascam "pre" and dave has his all the way down too.
  11. Markd102

    Markd102 Well-Known Member

    Because going out of one preamp into another is not desirable.
    You are sending a signal into the second preamp that is already line level. I'm 99% sure that will be your noise problem.
    Even when you daisy-chain the channels of the Seb you have to use the 1/4" I/Os
  12. frob

    frob Well-Known Member

    by-pass the makie and see the difrance.
  13. x-Greg-x

    x-Greg-x Guest

    Thanks, guys, for all the help. However, Dave is going to have to return the unit. We tried everything including eliminating the mackie from the chain, recording in a clothes closet etc. but to no avail. Its been 3 days and sadly, there are no more options.
  14. Markd102

    Markd102 Well-Known Member

    Get a replacement. There has to be something going on there.
    My 4000e is VERY quiet for a tube preamp.
    As you are no doubt aware, they are an exceptionally good preamp and are worth persisting with.

    Also Seb has a 30 money back guarantee, so you have plenty of time to sort this out.
  15. hawaii82

    hawaii82 Guest

    yeah it's strange because my 4000e is also really quiet...yeah it souldn't be a prob to change it via sebatron ... ;)

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