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Ampeg SVT 7 Pro - Cutting out ???

#81
I have had zero issues thus far.I got it friday. Master at 3 and gain at 2-3 -15db pad in. eq pretty much flat with ultra low engaged. I was trying to get it to shutdown but all the paintings were coming off the walls in my music room. Next time I have rehearsal ill get a better idea of if the amp will do it or not. At this point though I would say that its much improved from the first one I bought when they were first introduced.
 
#82
If you use anything less than a 15 amp rated power cord then the svt7-pro will cut out. I can't tell you how many times I've seen people use 10 amp cords on their amps and PA and they always fail. I label tape all my power cords and equipment with the specified and needed amp rating and never have any issues. Match and win! Try it and let me know.
 
#84
I recently contacted Loud Tech Inc. regarding this issue to understand EXACTLY why, that even in the REV 00C's, this issue still occurs and I got back what I believe to be a fairly straightforward response that clarified the whole situation for me:

The current revision of the SVT-7Pro is revision C and it is doing very well in the field.

If a SVT-7Pro is bought as new, the warranty is five years electronics and 90 days on accessories/tubes, based off of a copy of the invoice/sales receipt, covering manufacturer’s defects. Often times, we will have our products go into an authorized warranty service center for diagnosis to see if they can duplicate the problem.

However, with a symptom such as your describe, we first like to determine if the amp cutting out, is the result of a manufacturer’s defect or gain staging. The SVT-7Pro is a Class D amp and if it is sent a clipped signal/square wave it will gate itself. However, even if you aren’t seeing any Peak LED’s coming on, we can still overload the circuit. One thing we recommend doing is turning the compression all the way down when you set your initial levels, this way you can guarantee that you have a nice clean signal, and are then applying compression to that same signal.

Compressors are great for warming up a signal, but if one is clipping already it will just turns a very dynamic square wave into a smaller square wave.

Finally understanding the issue has at the very least gotten rid of the nagging doubt in the back of my mind when it comes to considering their products, because I now understand exactly why such a thing would occur in this particular product. I've been frantically researching because I bought the SVT7 just a few days ago and I am currently waiting for it to reach my front door to be paired with svt-410hlf!

I should be expecting it early next week and will test out this gain-staging theory although I feel confident it will go as expected. If I can't get a decent fuzz from overloading the amp without it cutting out, I MAY reconsider my purchase, but then again I can always rely on my Woolly Mammoth for that... Hopefully, this post will up helping some of you who are shopping around for new heads.
 
#85
This is great information, thanks! I just got my SVT-7 three days ago and have yet to have the opportunity to open it up in a live or band practice setting. I have played with the gain knob some at home practice level volumes and you can get quite a bit of overdrive out of this head. This is fun to mess with but I don't think I would ever use it much in a band situation especially since this is a single channel amp and I am a set it and forget it type player. If I ever felt like I needed more than it could deliver without issue I would probably go the pedal route. Ideally I would expect it to be able to break up some when digging in without problems at gig-type levels.


Cranstonator said:
I recently contacted Loud Tech Inc. regarding this issue to understand EXACTLY why, that even in the REV 00C's, this issue still occurs and I got back what I believe to be a fairly straightforward response that clarified the whole situation for me:

The current revision of the SVT-7Pro is revision C and it is doing very well in the field.

If a SVT-7Pro is bought as new, the warranty is five years electronics and 90 days on accessories/tubes, based off of a copy of the invoice/sales receipt, covering manufacturer’s defects. Often times, we will have our products go into an authorized warranty service center for diagnosis to see if they can duplicate the problem.

However, with a symptom such as your describe, we first like to determine if the amp cutting out, is the result of a manufacturer’s defect or gain staging. The SVT-7Pro is a Class D amp and if it is sent a clipped signal/square wave it will gate itself. However, even if you aren’t seeing any Peak LED’s coming on, we can still overload the circuit. One thing we recommend doing is turning the compression all the way down when you set your initial levels, this way you can guarantee that you have a nice clean signal, and are then applying compression to that same signal.

Compressors are great for warming up a signal, but if one is clipping already it will just turns a very dynamic square wave into a smaller square wave.

Finally understanding the issue has at the very least gotten rid of the nagging doubt in the back of my mind when it comes to considering their products, because I now understand exactly why such a thing would occur in this particular product. I've been frantically researching because I bought the SVT7 just a few days ago and I am currently waiting for it to reach my front door to be paired with svt-410hlf!

I should be expecting it early next week and will test out this gain-staging theory although I feel confident it will go as expected. If I can't get a decent fuzz from overloading the amp without it cutting out, I MAY reconsider my purchase, but then again I can always rely on my Woolly Mammoth for that... Hopefully, this post will up helping some of you who are shopping around for new heads.
Click to expand...
 
#89
So I got my brand spankin' new SVT-7PRO (REV C00) a few days ago and within 5 minutes, there was a lot of hiss and nasty crackling. Granted, I was liking (not loving) the tone I was getting out of the head, but I didn't even get a chance to dial the EQ to my liking before this happened. My guess is that it had something to do with the preamp tube or transistors, but the fact that it let me down so quickly has turned me off to Ampeg altogether.

I really wanted to like this amp as I had tried it out before, but I can't risk this happening during a show. I would hate to be playing with even an ounce of doubt in the back of my mind. I went to my local music store and tried out a few Markbass heads with my SVT-410HLF and I must say, I was more than pleased with the sound I was getting. I've just purchased a Markbass LM800 Tube after trying it out along with the LMIII and the regular LM800. I've heard nothing but great things about Markbass especially when it comes to durability (even though these heads are light as a feather) and consistency in quality.

All in all, if you're considering an Ampeg head, be somewhat wary. As for the cabs, I strongly recommend the SVT-410HLF to fill out your bottom end, especially if you're playing a short scale. It sounds like a dream with my '63 Hofner violin bass and although I have to drastically change the EQ settings from what I use for the Hofner when playing my long scale Modulus Flea bass, it still sounds gorgeous through the LM800 Tube.
 
#91
Cranstonator said:
I recently contacted Loud Tech Inc. regarding this issue to understand EXACTLY why, that even in the REV 00C's, this issue still occurs and I got back what I believe to be a fairly straightforward response that clarified the whole situation for me:


However, with a symptom such as your describe, we first like to determine if the amp cutting out, is the result of a manufacturer’s defect or gain staging. The SVT-7Pro is a Class D amp and if it is sent a clipped signal/square wave it will gate itself. However, even if you aren’t seeing any Peak LED’s coming on, we can still overload the circuit. One thing we recommend doing is turning the compression all the way down when you set your initial levels, this way you can guarantee that you have a nice clean signal, and are then applying compression to that same signal.

Compressors are great for warming up a signal, but if one is clipping already it will just turns a very dynamic square wave into a smaller square wave.
Click to expand...

I'm not sure, but it sounds, unfortunately, as if you are being told in this reply that "if you push the pedal too far the wheels will be cut off the car, and we don't warranty that, it isn't a defect".

I don't like that......

Sure, it is a class-D.... OK, fine. You should be able to push it like any other amp without worrying that it will cut out or need to be reset, etc.

My understanding of the "C" version is that it substituted a "clipper" for the prior "limiter" to prevent overdriving the class-D modulator. That *should* be a pretty secure prevention of troubles....... there are other ways to deal with the problem also, depending on how the modulator works.

Again..... unless I don't understand this, it seems like the amp is being described BY LOUD as not self-protecting against "stuff that happens".

Maybe the customer service person does not understand correctly.
 
#92
I bought an SVT7-Pro about a month ago, special ordered from Sam Ash. I have been using it weeklyn at my bands rehearsal spot. I play it through a Genz Benz Uber 410, 4 ohm cabinet and playing a Fender American Standard P Bass with C# tuning.

Last night after about 2 hours it had cut out on me a few times. At first while I had the -15db out and also when the -15db was in. I just emailed Loud with the symptoms and my settings which I will post below - any suggestions would be appreciated. I am just past my 30 day refund and before my 45 day exchange with Sam Ash. Thanks all -

There were my settings, with 5 being at the 12:00 position, or straight up.

-15bd was initailly OUT, after it cut out like 3 times I pushed it IN and it still cut out.

Ultra Bass IN
Gain 6 or 7
Midrange 5
Frequencey was set to the 2 or 3 position
Treble 6 or 7
FX 0
Master 5
 
#93
Da Funky Fish said:
I bought an SVT7-Pro about a month ago, special ordered from Sam Ash. I have been using it weeklyn at my bands rehearsal spot. I play it through a Genz Benz Uber 410, 4 ohm cabinet and playing a Fender American Standard P Bass with C# tuning.

Last night after about 2 hours it had cut out on me a few times. At first while I had the -15db out and also when the -15db was in. I just emailed Loud with the symptoms and my settings which I will post below - any suggestions would be appreciated. I am just past my 30 day refund and before my 45 day exchange with Sam Ash. Thanks all -

There were my settings, with 5 being at the 12:00 position, or straight up.

-15bd was initailly OUT, after it cut out like 3 times I pushed it IN and it still cut out.

Ultra Bass IN
Gain 6 or 7
Midrange 5
Frequencey was set to the 2 or 3 position
Treble 6 or 7
FX 0
Master 5
Click to expand...

This is an old thread - anyway, this is my first thought - since Sam Ash will still exchange the amp and since it cutout a few times last night I’d exchange it for another 7Pro just incase you got a lemon. Ampeg sells thousands of 7Pro's so it wouldn’t be uncommon to have a few lemons slip out every once and while.
 
#94
If it can not be returned but can be exchanged the best advice anyone can give you with all the cut out reviews (far to many to be lemon issues) is to exchange and STRESS with samash that you need the latest revision as they have been reported to have the problem fixed.

In the future, search the web for reviews, I feel like no one should buy an SVT7 with out extreme cation now that this thread exist.

Da Funky Fish said:
I bought an SVT7-Pro about a month ago, special ordered from Sam Ash. I have been using it weeklyn at my bands rehearsal spot. I play it through a Genz Benz Uber 410, 4 ohm cabinet and playing a Fender American Standard P Bass with C# tuning.

Last night after about 2 hours it had cut out on me a few times. At first while I had the -15db out and also when the -15db was in. I just emailed Loud with the symptoms and my settings which I will post below - any suggestions would be appreciated. I am just past my 30 day refund and before my 45 day exchange with Sam Ash. Thanks all -

There were my settings, with 5 being at the 12:00 position, or straight up.

-15bd was initailly OUT, after it cut out like 3 times I pushed it IN and it still cut out.

Ultra Bass IN
Gain 6 or 7
Midrange 5
Frequencey was set to the 2 or 3 position
Treble 6 or 7
FX 0
Master 5
Click to expand...
 
#95
Joe Louvar said:
This is an old thread - anyway, this is my first thought - since Sam Ash will still exchange the amp and since it cutout a few times last night I’d exchange it for another 7Pro just incase you got a lemon. Ampeg sells thousands of 7Pro's so it wouldn’t be uncommon to have a few lemons slip out every once and while.
Click to expand...

I think it is obvious by now that these cut outs are not lemon issues but early version issues (if not something worse).
 
#96
OhulahanBass said:
I think it is obvious by now that these cut outs are not lemon issues but early version issues (if not something worse).
Click to expand...

No, the OP just bought it from Sam Ash so this should be the newest version and when you compare the few problem reports with all the praise reports I think it just a lemon - it happens, expressly when they sell thousands.
 
#97
Joe Louvar said:
No, the OP just bought it from Sam Ash so this should be the newest version and when you compare the few problem reports with all the praise reports I think it just a lemon - it happens, expressly when they sell thousands.
Click to expand...

Agreed, seems (from what I have read) new revisions have had little to no problems.

However, old stock of the first version could still exist at Sam Ash, which is why I would express the importance with Sam Ash that I need a rev. C or what ever the current revision is. If your SVT7 acts like an original version SVT7 or has the same non isolated issue Acoms Razor tells us most likely it is an original version or has the same issue.

Keep in mind the small talkbass sample set and frequency of reviews all reporting the same problem.
 
#98
I've done plenty of research and still decided to buy the SVT7-Pro and I do have a Rev C. I've emailed Loud and the Sam Ash salesperson is a friend so I have a little time to see what Loud says and I'm assuming 'exchange' with Sam Ash if necessary. I posted here after searching the forum with 'cutting out' so I figured I'd be a little helpful with my SVT7 issues/story.
 
#100
i just found my old 1978 Big Muff distortion unit (op amp version) and was playing it thru my 7Pro today at full clip. evidently mine doesn't seem to mine having a full clip square wave running thru it at all, not that i'd really ever use it that way. and BTW, when the red overload light was on almost continuously because i was just boosting it way too much, it did have a very slight gating effect a couple of times, but it never cut out (tried to protect itself). once i had it flickering about 50 percent, no gating, and like i said, no cutting out.

with certain 4 ohm cabs of mine, my GK 1001RBII will go into it's protect mode for about 5 seconds and then come back on (and it's not class D), so i think that the cutting out issue with some of these amps is a particular cab's impedance/load at different freqs and power levels that you're running them with.
 

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