Turning off when hot

[Knightstick]

Hello, my crack has been working wonderfully for almost a month now but started having trouble this morning. It was running perfect for about 15 minutes and then just faded out. Neither of the tubes were glowing at that point, and all input was double checked and was good. I waited about 30 minutes, and tried again. It ran perfectly again for about 15 minutes, and then shut down. I'm kinda at a loss as to what's going on. Any help would be greatly appreciated. Thanks in advance.

[Paul Birkeland]

You almost certainly have a loose connection in your amp.  If the tubes aren't glowing, then you either have a loose connection between the power inlet and your power transformer, or the green twisted pair of wires leaving the transformer and going to the B socket isn't well connected.