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How the hell do you bias this svt-vr???

Discussion in 'Amps and Cabs [BG]' started by Remsouille, Jan 6, 2009.

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  1. Jan 6, 2009 #1
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    Hi there!!

    I was wondering how i could send a 40hz signal to my svt-vr without an oscilloscope, and how to check the output signal with my multi-meter.
    http://ampeg.com/pdf/SVTVR.pdf
    And by the way: I just got NOS General electric 12AX7 for my preamp. Do you think it is necessary to put such good tubes in the driver section?

    Thx for you help guys!!!:bassist:
     
  2. Jan 6, 2009 #2
    johnk_10

    johnk_10 vintage bass nut Supporting Member Commercial User

    Feb 16, 2008
    Washington, Utah
    John K Custom Basses
    actually, as per the manual, you would be setting the balance and not the bias with a 40hz signal. a signal generator (and a DVM to measure the 25V RMS is required) to set the driver tube's balance pot so it drives each trio of 6550's equally.
     
  3. Jan 6, 2009 #3
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    oh sorry, i meant the balance....
    I guess this will sound very "newbish" but.... what is exactly a DVM?
     
  4. Jan 6, 2009 #4
    johnk_10

    johnk_10 vintage bass nut Supporting Member Commercial User

    Feb 16, 2008
    Washington, Utah
    John K Custom Basses
    a Digital Volt Meter.
     
  5. Jan 6, 2009 #5
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    F*** me sideways!!!!

    And how do i set my voltmeter on the output when the cab is plugged???

    Hey man thank's so much for your help, it feels like a hotline!!!!:hyper::hyper:
     
  6. Jan 6, 2009 #6
    JustRob

    JustRob

    Dec 15, 2008
    Central USA
    You need to use a dummy load. No offense, but it doesn't sound like you're equipped to do this procedure.
     
  7. Jan 6, 2009 #7
    uaudio

    uaudio

    Apr 11, 2008
    Arizona
    +1(999 list price to replace it)
     
  8. Jan 6, 2009 #8
    MHensleyJr

    MHensleyJr Supporting Member

    May 5, 2008
    Redlands, CA
    Took the words right out of my mouth.:rollno:
     
  9. Jan 6, 2009 #9
    Beyer160

    Beyer160

    Dec 20, 2008
    NC
    Not to mention the fact that tube amps can kill you dead if you make the wrong move under the hood. Ampegs are especially dangerous in this regard.
     
  10. Jan 6, 2009 #10
    JustDavid

    JustDavid

    Oct 21, 2008
    Halifax, NS, Canada
    $999 for the head, or for the guy poking around in it?

    OP, be safe!!
     
  11. Jan 6, 2009 #11
    BassmanPaul

    BassmanPaul Inactive

    Aug 25, 2007
    Scarborough Ontario Canada
    If you have a problem with the amp and don't even know what a DVM is, then you should take the amp to a Tech. It will be cheaper that way in the long run.

    Paul
     
  12. Jan 6, 2009 #12
    uaudio

    uaudio

    Apr 11, 2008
    Arizona
    That was supposed to be $1999; I'd have to evaluate the OP's balance sheet before I made a judgment on his replacement value. :smug:
     
  13. Jan 6, 2009 #13
    iamthebassplayr

    iamthebassplayr

    Jun 24, 2008
    Sacramento, CA
    We haven't seen him for an hour.... I think we lost him...
     
  14. Jan 6, 2009 #14
    MingusBass

    MingusBass Supporting Member

    Sep 27, 2004
    Fort Wayne,Indiana
    And the Darwin Award goes to...
     
  15. Jan 6, 2009 #15
    Surly

    Surly

    Feb 2, 2007
    South Florida
    Don't touch the transformers with your tongue :p
     
  16. Jan 7, 2009 #16
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    Back and alive!!!!
    If i did'nt know what a dvm is, it's just because i'm french, and we do not use this abbreviation. I'm not as "newbish" as you can imagine, it was some sort of humility manifestation for my first thread...
    Actually i'm used to work with high voltage, and i know a minimum about electronics.
    If i try to solve this problem alone, it's because the nearest place i could send my svt to do that damn "balance" thing would be at least 500 km from where i live...so...
    Once again, it's all about language, i probably know what it is in french, but i can't figure out what a dummy load is...
    EDIT: I found out. We call it "une charge passive" in french.

    Thanks for your patience, i understand your concerns.:bag:
     
  17. Jan 7, 2009 #17
    Willem

    Willem

    Dec 26, 2005
    Belgium
    Hey Remsouille, you can always fill in your location in your profile so people will see immediately that you are not from an English speaking country.
     
  18. Jan 7, 2009 #18
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    That's a good idea, dear european fellow!!!
     
  19. Jan 7, 2009 #19
    082752

    082752

    Jan 1, 2009
    Hoe much does funerals cost over there?
     
  20. Jan 7, 2009 #20
    Remsouille

    Remsouille Guest

    Nov 23, 2008
    Mulhouse, France
    As expensive as anywhere on this planet...
     
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