2000s Ampeg SVT-2 Pro

[EGC]

My Svt-2 pro recently stopped working. As I started to play, it made a pop/boom noise, all audio cut, and the fault indicator started flashing. I had my amp guy look at it, and he tested the tubes. They are all working. He said it is probably an issue with some of the solid state technology, which he is not savvy with, so I have to send it to a different guy. The only reason I could think of it quitting on me is because I played the national anthem at a basketball game with an octave/fuzz pedal, at a fairly high volume. What do you guys think the problem is? 

[itu]

If @agedhorse and @Bill Fitzmaurice have nothing to say to this, there are very few left.

[Dood]

It’s be impossible to tell without looking at the amplifier. A bit like asking why a car won’t start. However, unlike cars, the schematic diagrams for the SVT 2 Pro are readily available and, any electronics engineer worth their salt would be able to fault find the boards, irrespective of it being a valve amplifier. I haven’t worked in fault diagnosis for many years, but I can see that the “fault condition” circuitry (if that isn’t at fault itself) checks for expected voltage levels in multiple areas of the schematic, so, I’d start by tracing those against expected voltages. (Taking the necessary safety steps as not to cause more damage to the amplifier). Ergo, take it to a tech. Contact Yamaha to find out where the nearest service centre is.. I have a sneaking suspicion it’s not in the UK if any official centre for the SVT..

Edited Thursday at 15:24 by Dood

[agedhorse]

It could be any number of issues. If the OP is in the US then any QUALIFIED, Ampeg authorized service center should be capable of properly diagnosing the fault (the first step in any repair) and then repair the amp.

 

If the OP is in the UK, Surrey Amps is qualified and capable of handling the diagnostics and repair.