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Ampeg SVT 8 Pro confusion

#21
stingraysvt said:
Tom what's the lowdown on the 8 pro? I like the simulated tube power amp section and power reduction capabilities.

I read on eBay there were only 30 US made 8 pros?
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I really love the 8Pro. It has a similar tone to the 4Pro and 7Pro, but is more harmonically rich/complex, and you can really dial in a huge range of useable grit/grind/overdrive. It does the clean thing very well, too. We did test mine briefly with BGM's Audio Precision system, and it absolutely lives up to its published specs.
 
#22
I have a korean made SVT 8 Pro. I had/have it listed here for sale, but i decided to bring it with me to my last gig and it really blew me away. Definitely going to keep it. I like it much more than the SVT 4 pro. It would be cool if it had all of the biamp capabilities of the 4 pro, but the tone more than makes up for it.
 
#23
There were something over 30 made.... IIRC it was closer to 100, but it got complicated because so many of those went straight to the Artist Relations department...... i.e. endorsers. Those were never accounted for, quite, they were stacked up in the "outgoing", and then they were not there.....

I have never seen a Korean made 8PRO, I have no idea what may or may not have been changed in the process of moving it over there. I assume they are still universal voltage etc....

There were some QC issues that needed to be addressed with regard to some transformers, which were a bit hard to make, and had a high reject rate.... With a bad transformer, the unit would tend to randomly trip off for a "power supply overvoltage" issue... A slight change to the transformer would have made it much easier to make.
(For the SMPS wonks, if any, the secondary side leakage inductance of the main 66 kHz transformer in "bad" units was turning out higher than expected, and "ringing" charged up the supply faster than the existing bleeders would discharge the energy.)
 
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#25
I think any that were shipped should be fine..... it was more an issue of units that needed re-work, and transformers that couldn't be used.

In any case, it only took doubling up the "bleeder" resistors to fix it, IIRC, so it wasn't by any means an insoluble problem. But the place on the PWB only accepted a certain wattage part, extras would have to be added "on top", which is not quite up to ruggedness standards.

I wouldn't worry too much about it.

For the SMPS "wonks"..... when you make an SMPS that is able to supply over 50A short term, it can get tricky if the load can be as little as 50 mA with the amp idling..... that's about a 1000:1 load ratio, when most SMPS are capable of only 10:1 or so.
 
#26
Jerrold Tiers said:
For the SMPS "wonks"..... when you make an SMPS that is able to supply over 50A short term, it can get tricky if the load can be as little as 50 mA with the amp idling..... that's about a 1000:1 load ratio, when most SMPS are capable of only 10:1 or so.
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Interesting! Thanks for sharing (and for dreaming up the 8Pro!). :cool:
 

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