slystewart Posted December 30, 2016 Share Posted December 30, 2016 I have had this amp from new now just over two years old ,just before christmas at a gig on stage for 3 songs then no sound out of the amp with flashing green / red fault light on Got through the night and today checked it out to find at the back of the amp a red bias light on all of the time on the left side, turn it down a bit power on the amp it works but a hum there all the time alter the bias up a bit and amp shuts down to red /green fault any one at ideas thanks Stewart Quote Link to comment Share on other sites More sharing options...
Subthumper Posted December 30, 2016 Share Posted December 30, 2016 Sounds like you have a faulty power valve. There is a monitor system connected to each output valve, if even one is faulty it cuts the relay that switches the ht circuit on and prevents damage to the amp. There are a set of resistors ,one for each power valve across which the bias current in monitored which can end up blown if the valve goes short circuit. Suggest you get the amp to a tech who can test the valves and check out the cathode resistors and replace if necessary. Ive done a few of these on svt 2s which use the same circuit. It's not the end of the world but does need to be done by someone who knows what their doing due to the very high voltages within these amps. If you're in the Bristol area drop me a line. Quote Link to comment Share on other sites More sharing options...
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