How Long Should a First Watt SIT3 Last ?

One of the pair of QS Mid Monos was acting up. I took both in to be serviced and it was a capacitor that needed replaced.The tech replaced the cap on both and they're still going strong several years later at my brother's house. The repair was $85.

Any shop that works on guitar amps will be able to diagnose and repair the QS if you decide to have them checked out. What I didn't mention before so as not to throw shade on Mike Sanders, is I initially shipped him the amp that wasn't working.What he told me was he hooked it up,plugged it in, and it worked fine.He didn't do any testing and sent it back to me. One power tube still red plated and there was no sound. The shop I chose to check both of them out found the issue quickly and had them back to me in a week.We all have bad days and make mistakes so there's no hard feelings from me at all. He didn't even charge me a bench fee.

One thing the tech at the shop advised is he recommended to stick with EL34s with the mid monos and not push them hard with more powerful tubes.

Good to hear! Have a happy 4th:-)