PauBass Posted November 5, 2010 Share Posted November 5, 2010 (edited) At band practice last night my SVT 4 Pro stopped working, well it didn't stop, the sound volume dropped and distortion was comnig through instead of clean tone. I use the Ampeg in mono bridge mode with the right cable, it's not the cab as I tried it with another amp and worked fine. I tried the two power amps separately and I found the problem lies on power amp A, B works fine but A is the one not pumping enough volume and distorting. Any ideas? Edited November 5, 2010 by PauBass Quote Link to comment Share on other sites More sharing options...
waynepunkdude Posted November 5, 2010 Share Posted November 5, 2010 I'm not a 100% but my 5Pro was doing a similar thing but with both power amp turned out to be the mosfets. Quote Link to comment Share on other sites More sharing options...
PauBass Posted November 5, 2010 Author Share Posted November 5, 2010 [quote name='waynepunkdude' post='1013442' date='Nov 5 2010, 04:02 PM']I'm not a 100% but my 5Pro was doing a similar thing but with both power amp turned out to be the mosfets.[/quote] Thanks! Where did you have it repaired, please? Was it expensive? Quote Link to comment Share on other sites More sharing options...
waynepunkdude Posted November 5, 2010 Share Posted November 5, 2010 [quote name='PauBass' post='1013575' date='Nov 5 2010, 06:17 PM']Thanks! Where did you have it repaired, please? Was it expensive? [/quote] These guys it was quite pricey but I had a full service done at the same time. [url="http://www.panicmusic.co.uk/"]http://www.panicmusic.co.uk/[/url] Quote Link to comment Share on other sites More sharing options...
PauBass Posted November 5, 2010 Author Share Posted November 5, 2010 [quote name='waynepunkdude' post='1013598' date='Nov 5 2010, 06:36 PM']These guys it was quite pricey but I had a full service done at the same time. [url="http://www.panicmusic.co.uk/"]http://www.panicmusic.co.uk/[/url][/quote] Great, cheers! I'll get in touch with them. Quote Link to comment Share on other sites More sharing options...
Subthumper Posted November 8, 2010 Share Posted November 8, 2010 Hi, I did some work on a svt 4 this year and though it was a different fault it was a bad solder joint which having trawled through numerous forums seems to be a common problem on these, even though ampeg themselves dont seem to aknowledge this problem. Its the first place I'd look, though it ca be a time consuming process. Also make sure all the efects send and return sockets are clean and not causing problems. Check the fuses too as if it were a problem with the mosfets they would uaually blow. Look for the simplest solution first. Good luck cheer Just Quote Link to comment Share on other sites More sharing options...
PauBass Posted November 10, 2010 Author Share Posted November 10, 2010 [quote name='Subthumper' post='1016738' date='Nov 8 2010, 07:01 PM']Hi, I did some work on a svt 4 this year and though it was a different fault it was a bad solder joint which having trawled through numerous forums seems to be a common problem on these, even though ampeg themselves dont seem to aknowledge this problem. Its the first place I'd look, though it ca be a time consuming process. Also make sure all the efects send and return sockets are clean and not causing problems. Check the fuses too as if it were a problem with the mosfets they would uaually blow. Look for the simplest solution first. Good luck cheer Just[/quote] Thanks for the advice, I'll check everything you've mentioned. Quote Link to comment Share on other sites More sharing options...
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