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ampeg svt classic

Discussion in 'Amps and Cabs [BG]' started by bassman60, Jul 5, 2001.


  1. bassman60

    bassman60

    Jun 5, 2001
    I've been reading the specs on this amp and it says it has a 4 ohm/2 ohm selector on it. Is 2 ohms comfortable for this amp? or would it somehow shorten it's life? The reason I'm asking is because it can't handle an 8 ohm for some reason according to the ampeg website, and I want to have two separate cabinets for moving purposes, probably a 4x10 and an 18. Do you think this amp would be comfortable at a 2 ohm load? thanks for the feedback.
     
  2. It should run just fine with a 2 ohm load.

    But it would be happiest with an 8x10 cabinet. ;)
     
  3. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    The head would run fine on 2 ohms <b><u>IF</u></b> the 2 cabs you are using are 4 ohms each. If they are 8 ohms each, you should run the head @ 4 ohms. If one is 8 & the othe is 4, I have been told not to use the two cabs w/the head.

    I have an SVT 2 Pro which has the same 2/4 ohm switch but nevet used it w/2 cabs. I either use an SVT 810 or an SVT 410 HLF which are both 4 ohm cabs & handle the head fine.
     
  4. boogiebass

    boogiebass

    Aug 16, 2000
    That's ridiculous. Where does it say that and what exactly does it say, please?
     
  5. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    <a href="http://ampeg.com/products.htm?product=47&catid=10"><font color=white>RIGHT HERE.</font></a> The SVT Classic & SVT-2 PRO can be run on 2 or 4 ohm's. You probably couldrun it @ 8 ohms on the 4 ohm position, but why would you run a 300 watt all tube powerhouse through an 8 ohm cabinet? You would be seriously be under powering the speakers & possible damage something.
     
  6. boogiebass

    boogiebass

    Aug 16, 2000
    It most certainly does NOT say you can't run it with an 8ohm load. In fact, you'll note that it states to run the amp at the recommended minimum load or above. Obviously, running an 8ohm cab would not allow it to deliver its full wattage. But it will "handle" an 8ohm load with ease and there is absolutely nothing wrong with using that cab to drive a single 8ohm cab. I've done it more times than I can remember when I didn't need two cabs.
     
  7. Tube amps provide their wattage at ANY load that it can handle.
    A head can handle impedence that's higher that it's rating with no problem - eg a 4ohm head WILL run an 8ohm cab with no problems.
    And it would be fine to run the head @ 2ohms even if the total load was > 2ohms...i've heard that vintage Ampeg V4 and V4Bs should be run @2ohms even with a 4ohm cabinet to be on the safe side.
     
  8. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    I woldn't. but that's just me. :)
     
  9. FWIW, i've been running my '7? Ampeg V4 through an 8Ohm cabinet all weekend with the impedence selector on the amp set to both 4Ohms and 2Ohms. No problems at all.
     
  10. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    More power to you. But like I said, I wouldn't mess w/ohmage of tube amps. I'm just weird like that. :)
     
  11. Funkster

    Funkster

    Apr 6, 2000
    Wormtown, MA
    I run a SVT Classic and I use two 8ohm cabs, a Ampeg 410HE & 115HE but I plug the 15 into the 410 and the 410 into the head, I believe that means in series. I think that makes it a 4ohm load (I hope) thats the way I have been running it and please if this is wrong let me know.
    Anyway it sounds killer!!
    Pic of the rig
    [​IMG]
     
  12. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    Funkster, you're running it correctly. Since you put a picture, Here's mine:


    <img src="http://albums.photopoint.com/j/View?u=1174383&a=8647027&p=50445750">

    This head cost too much money for me to be second guessing it. I use either my 4 ohm SVT 410
    HLF or my 4 ohm SVT 810. Never needed to use both @ the same time. I heard you can & can't by reputable bassists & I just feel that I shouldn't. My luck, the head would blow up on the 1st note of the set!!! LOL :)
     
  13. Funkster

    Funkster

    Apr 6, 2000
    Wormtown, MA
    Great Pic Nino! Thanx,I thought I was doing the right thing,
    Funny, I love the the sound of my newer Ampeg stuff, I have a SVT Classic and a SVT3 pro and I love them both.
    I had to say it:D With all the Ampeg bashing around here, Do I dare ;)
    I'm glad to see that I'm not the only one who digs the sound of AMPEG.
     
  14. Rickenbackerman

    Rickenbackerman

    Apr 17, 2001
    Laurel MD
    I've got a '72 SVT - running two eden 410XLT's, each 8 ohm. I run them in series for a total load of 4 ohms. I don't have the nuts to try one cab (8 ohms)... with my luck my SVT would explode or something! Doesn't matter, I need both of them anyway. Love the old Ampegs!
     
  15. The jacks on these cabs are wired parallel. You are running the two cabs parallel, the same as you would if you plugged each into the 1/4" jacks on the amp. Two 8 ohm cabs parallel equals a total impedence of 4 ohms. Wiring in series (which is not possible with these amps/cabs) will double the total impedence to 16 ohms.
    I love that setup you got there. Great stuff.
    BTW, I've always wondered, what is that hole/circle thing on the grill of the SVT-CL??
     
  16. boogiebass

    boogiebass

    Aug 16, 2000
    Fan.
     
  17. Duh, I should have figured it was a fan. Just like the back of my 3PRO. You can't see it live really but it always shows up on pictures. It's kinda like black drum heads that you can see through on camera.
     
  18. Funkster

    Funkster

    Apr 6, 2000
    Wormtown, MA
    cubeenz thanx for the correction.
    So let me get this straight, the speaker jacks on my SVT Classic are wired in parellel so that I can plug two 8ohm cabs into the head and that makes it a 4ohm load? or plug one cab into each other and then one into the head and that's parellel also for a 4ohm load? I just want to make sure that I run my rig as efficiant as possible.
    Thanx for the compliment! It is a killer sounding rig matched with the 77 MusicMan.
    That spot on the grill is the fan, The grill cloth ends up becomming a filter.
     
  19. Nino Valenti

    Nino Valenti Commercial User

    Feb 2, 2001
    Staten Island NYC
    Builder: Valenti Basses
    You could run it either way, it'll work.

    I remember someone telling me to run 2 different cables from the head to each individual cabinet. I don't remember the exact reason or thou. I think it was something to the effect that one cab will get more power & might blow.
     
  20. Rickenbackerman

    Rickenbackerman

    Apr 17, 2001
    Laurel MD
    I've not looked at the back of a classic in a while, but if the classic is the same as my '72, then there are two speaker outputs on the back of the head. If you use ONE output(either one), the output transformer wants to see an 4-ohm load. If you use BOTH, the transformer wants to see a two ohm load. It's a function of the way the transformer is wired to the output jacks.

    Unless, of course, the classic has a 4/2 ohm selector on the back... does it?

    When I use two 8-ohm cabs with my old SVT, the ONLY correct way to wire it is by putting the cabs in parallel - one cable from head to cab, and another cable from cab to cab. Total load = 4 ohms.