My SVT-6 Pro has 4 tubes in the power section, but it's also solid state. Do I need to load the amp to play or can I use it for DI purposes without a cab? Ampeg addressed the issue in their faq, but unfortunately didn't cover the 6 Pro. "Any Ampeg amplifier with a solid state output (SVT-4PRO, SVT-3PRO, SVT-350H, B-5,4, and 3R) can be used for recording purposes using only the line output to record and without speakers attached to the speaker jacks. The amp must have a speaker load if the amp has a tube output section (SVT-CL, SVT-2PRO, and V-4B), not doing so can result in extensive damage to the amplifier."