I have looked all over the internet to find a schematic for the SVT-DI box. It's a little over 10 years old and is having a bit of trouble with the tube. I've taken it to a professional in Dallas but he also can't find the schematic. And he's never worked on an SVTDI before. Is there someone who knows where I can find the schematic? It's not on the Ampeg website. I've tried reaching out to Ampeg customer support and even sent an email to Obeid Khan (the lead engineer with Ampeg when the SVT DI was released). There hasnt been any response from either party. I love the DI! I'd love to be able to have it fixed. Thanks everyone!