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ampeg svt-7 PRO Startup issues

Discussion in 'Amps and Cabs [BG]' started by Max Schupp, Jun 22, 2020.

  1. Hey guys,
    i just bought a new Ampeg SVT-7 PRO and everytime i switch it on, it takes about 5-10 seconds during which the amp is emitting huge audible crackling signal spikes via headphone out and DI out. EDIT: but not via cab
    is that normal? or should i return it ?
    Last edited: Jun 22, 2020
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Best recommendation is to return it. That's obviously not right.
  3. its like a car revving up or smthing ...
  4. ugly_bassplayer


    Jan 21, 2009
    Yay....after blowing up for years now this.

    7 pro is horrible.

    And I like Ampeg.......still got my 20 year old svt 4pro. Its a tank.
    birminghambass likes this.
  5. so its defenitely worrysome and i should return it ??? ive been gassing for an amp for so long now and :crying::crying::crying::crying: gosh darnit i was so happy with the sound and all!!
  6. sometimes its only one crackling sound, sometimes more.
  7. Geri O

    Geri O

    Sep 6, 2013
    Florence, MS
    Bad news. Return it sooner than later....
  8. the volume is accurate btw, i may have exaggerated by using the word "huge"
  9. Lovep

    Lovep Supporting Member

    Mar 17, 2011
    Indianapolis, IN
    I would return and get another one. Having said that, it doesn’t sound horrible. I probably never hear it, if it’s just Di and headphone out in the first 5 secs. It takes me much longer to strap on my bass and headphones...
    Max Schupp likes this.
  10. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    I missed the part about it just being only the DI and Headphone output... that could be entirely normal if it's only a second or two, and the same may occur at power down. This is a question to ask Ampeg's technical support folks.

    If anybody has one and can test this way with headphones, that would be another good data point.
    Raw N Low, Max Schupp and Lovep like this.
  11. MD-BassPlayer

    MD-BassPlayer Supporting Member

    Jun 19, 2003
    You found the hidden drum machine feature. ;-)
    Max Schupp and Thundar like this.
  12. The amp does take a few seconds to start up - that part is normal.
  13. I know they did in the early days but do recent models have issues?

    FWIW it's one of the best amps I've played through.
    johnnynitro likes this.
  14. johnnynitro


    Jan 14, 2012
    I have a Rev F update after two breakdowns. Has been every bit as solid as my GK 400RB. My 7Pro has been going strong for awhile now !
    Max Schupp likes this.
  15. Geri O

    Geri O

    Sep 6, 2013
    Florence, MS
    I had a 7 Pro a while back and had the opportunity to use it a few times where I used the DI out and the headphone out (only once did I use both. Don’t remember all the details of the occasion).

    I never heard a crackle or any noise at all when I powered it up. It did take several seconds to “boot up”, as it were, but all the outputs were clean and quiet as it did so.

    That long power-up caused me some considerable angst for a few moments the first time I powered it up right out of the box. I was reaching for the power button to cycle the power when I heard it click on. I cycled it several times to make sure the long power-up was normal.

    I remember liking the 7 Pro a lot at the time.
    Max Schupp likes this.
  16. Hey guys, my dealer just contacted ampeg tech support and ut turns out its bormal behavior. Its a protection relay clicking a couple of times before powering on. He said if it truly gets problematic its under warranty so i can use it as is :)
    johnnynitro and Raw N Low like this.
  17. Raw N Low

    Raw N Low If I can't hear it, hopefully I'll feel it Supporting Member

    Jul 16, 2009
    Denver, Colorado
    I know some amps will have anywhere from a 5 to 20-second delay upon power-up that is usually mentioned in the manual.

    Ampeg makes mention of the power switch is more of an "on/standby", with a live circuit in standby. I'm not an engineer by any means but, I speculate why there is a power delay with some class A/B and D amps. If you're connecting your amp to a P/A or audio controller via DI, make sure the amp is powered on before you connect and power up the P/A and external device to avoid damage.

    The sound your getting from the headphones is normal. I would avoid powering up the amp with the headphones connected unless the master is turned down or the amp is muted.

    Lots of good info in the manual. :)

    Max Schupp likes this.
  18. Treblefree


    Apr 8, 2016
    Mine does this on the DI output sometimes when I start it up. it's at whatever volume level the house is on at the time. Kind of goes pop, pop, pop, pop in the house while warming up like a singer alliterating P's on a mic with no pop filter, then full sound comes on and no problems at all. Mine only pops about 4 times when it does this. I've never thought it was a defect. It never occurred odd to me; I just assumed it was part of warming up because it stops as quick as it starts and is always done before sound comes into my cabinet.
    Max Schupp likes this.
  19. Mute switch could come in handy here?
    Lovep, johnnynitro and Max Schupp like this.
  20. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Only if it's located after the source of the noise in the signal flow.
    rodl2005 and Max Schupp like this.
  21. Primary

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    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

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