I recently shipped my VAC Musicblocs back to the VAC factory via Fedex ground for service and upgrade. Even though I packed the amps better than shipped from the factory, the gentle-handed folks at Fedex managed to crack open one of the transformers, yet Kevin( in all his kindness) re-welded it back like new and charged me nothing for his services. I love my VAC amps and when and if I ever upgrade, I plan on staying in the VAC family.