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Ampeg SVTIIp schematic?

Discussion in 'Amps and Cabs [BG]' started by tabooze24, Apr 10, 2014.

  1. Any one have one?

    I need to repair the midrange inductor and need to know the orientation of pins 1 to 4.

  2. Passinwind

    Passinwind I Know Nothing Supporting Member

    Pin 4 to mid pot wiper
    Pin 1 to 470K resistor and pin 2 of mid freq switch

    Not sure where I found it online (via Google, probably) but I did at some point fairly recently. PM me if you can't do likewise and I'll work out a way to get it to you.;)
  3. Actually, pin 1 goes to a 220K resistor and a capacitor. The capacitor is in series before pin 2 of the mid switch. Pin 1 is marked with a "dot" on the PCB of the SVT IIp.

    I have a schematic of an SVT II NP bass head. The layout of the preamp in the SVT II head and the layout of the SVT IIp are totally different. Infact, the graphic eq frequency centers are also different.
  4. Passinwind

    Passinwind I Know Nothing Supporting Member

    Here's a screen shot from my schematic for the II Pro, Rev3:

  5. The SVT IIp is totally different than the SVT 2 pro.
  6. Passinwind

    Passinwind I Know Nothing Supporting Member

    I guess you're talking about the rack mount preamp, right? My bad, never seen nor heard of that model, and assumed you were talking about the II Pro head.
  7. Flatbass


    Mar 13, 2004
    Here's the schematic for the SVT-IIP, the single rackspace preamp: http://fileshare.eshop.bg/downloadsm/41186/Ampeg_SVT-2P.html

    By any chance, could you maybe say what could be the culprit when the bright input often drops in volume, but the normal input works perfectly fine?
    It doesn't seem to be a corroded input jack, but what else could it be? Any leads that I could pass on to a tech?
  8. B-string

    B-string Supporting Member

    Intermittent ground on the bright jack most likely, faulty R1 or C1 least likely.
  9. Yes. The rackmount pre.
  10. Thanks for the link. The quality is really bad :(
  11. Flatbass


    Mar 13, 2004
    You haven't clicked on the preview, have you?

    The actual file can be downloaded by clicking on this part:
    "Download >> To download the file, please, click here ! << Download"

    Okay, it's not the most beautiful schematic I've ever seen, but all the info you need should be there.
  12. Nope, I downloaded it. Its pretty hard to makeout whats going on unless you zoom on everything!