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01-20-2012, 09:00 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | Svt at 8 ohms
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Does an SVT still run 300 watts at 8 ohms?
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01-20-2012, 09:05 PM
|  | Registered User | | Join Date: Nov 2010 Location: Ohio | | For a while it will... 
Don't run it at 8 ohms if you can help it. |
01-20-2012, 09:06 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | Quote: |
Originally Posted by someparts For a while it will...
Don't run it at 8 ohms if you can help it. | What do you mean by this? Will it hurt it?
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01-20-2012, 09:07 PM
| | Registered User | | Join Date: May 2007 Location: GTA Ontario Canada | | Quote: |
Originally Posted by whitespike Does an SVT still run 300 watts at 8 ohms? | I believe it's output transformer only has 4 and 2 ohm tapps so it won't put out the full 300 at 8 ohms and it will run the tubes harder. I am by no means an SVT expert so I'll defer to one of the more experienced Ampeg users here on TB. If I had to guess on power at 8 ohms I would sayyyy......230-250 watts RMS at 8 ohms.
Again, I'm only a novice when it comes to tubes. |
01-20-2012, 09:07 PM
| | | | I did it for a while... went thru a few tubes because of it.. get a 4 ohm cab! |
01-20-2012, 09:08 PM
|  | Supporting Member | | Join Date: Nov 2008 Location: Lake Havasu City, Az USA | | | What model SVT? A lot of models are called "SVT" including many SS output ones.
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01-20-2012, 09:16 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | So it could hurt it? Crap. I have to look and what speakers I have. I replaced the speakers in my V4 412 a couple of years back for more powerful bass speakers. I feel like I would have replaced them with the same impedance. Did the V4 412 come in both 4 and 8 ohms?
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01-20-2012, 09:18 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | The model is the SVT PRO II that I am borrowing. I plan in purchasing an SVT Classic.
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01-20-2012, 09:31 PM
| | Registered User | | Join Date: Nov 2003 Location: St Louis | | You can usually do it if you don't push the amp, but it basically isn't a super idea..... no guarantees on what will happen.
Borrowed SVT? Play it like ya stole it? 
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01-20-2012, 09:52 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | Hadn't had PROBS so far. Really don't want to replace the speaker again if I can help it! I'm gonna take a speaker out and look when get off tour in a few days.
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01-20-2012, 09:55 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | I usually run the master and gain at 12 o'clock at most venues. Not sure how 'hard' that is. Sounds killer tho!
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01-20-2012, 10:00 PM
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Endorsing: Ampeg | | Join Date: Apr 2005 Location: Apopka, FL | | | Those settings would be considered on the borderline of hurting it IMHO.
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01-20-2012, 10:21 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | What exactly would it do to it?
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"My four string can beat up your five string."
Rickenbacker member #139, Ampeg member #510, Fender Precision member #100
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01-20-2012, 10:33 PM
| | Registered User | | Join Date: Nov 2010 Location: Ohio | | | Running an impedance mismatch is hard on the transformer and tubes, and I'd say a power tube meltdown will happen before a tranny issue on an SVT. My guitar player shorted a power tube in 5 minutes on his Marshall JCM900 due to a 100% mismatch like you may be running.
V4 guitar cabs were only 8 ohm that I know of, but you could have 4, 8 or 16 ohm replacement speakers in there wired series or parallel so you'll need to check both the speaker impedance as well as how it's wired up.
Simple fix if it is 8 ohm is get another matching cab. If you are running an SVT with gain and master at noon you'd probably appreciate what the extra cab would add anyway.
Last edited by someparts : 01-20-2012 at 10:38 PM.
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01-20-2012, 10:39 PM
| | Registered User | | Join Date: Aug 2009 Location: New Zealand | | | You can rewire an 8 ohm 4x12 into a 2 ohm 4x12, problem solved.
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01-20-2012, 10:40 PM
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Designer, 3Leaf Audio | | Join Date: Jun 2006 Location: Seattle / NYC | | | I've run an SVT at 8 ohms in recording sessions, but I wouldn't play it live that way. |
01-20-2012, 10:43 PM
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Endorsing: Ampeg | | Join Date: Apr 2005 Location: Apopka, FL | | | Overheat the output transformer and/or shorten tube life. My motto is it's ok for rentals, but NEVER WITH MY SVT!!!
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01-20-2012, 10:49 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | So I have a V4 I use too. I like the idea of rewiring it to 2 ohm but wonder if thatll be ok for the v4. I need to do what will work both amps.
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01-20-2012, 10:53 PM
| | Registered User | | Join Date: Nov 2007 Location: Austin, TX | | | The pro 2 actually stopped working on tour. Again I don't know my impedance and will check. On this particular gig in NY the room was down a shinny steep stairwell. They had a Hartke 410 downstairs so I just used it. It was fine all night. The next two gigs had SVT backline. The next night I tried to use it the light thing started blinking and it wouldn't work. I bet that Hartke was bad news. Had to use my V4 the rest of the tour.
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01-20-2012, 10:55 PM
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Endorsing: Ampeg | | Join Date: Apr 2005 Location: Apopka, FL | | | Hoo boy...hope it wasn't serious. I'd have it looked at by a competent tech.
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