Ampeg VH-140 c

[dlimmel]

Hey all, Im new here and I have an older Ampeg VH-140 c guitar head, it has worked great in the past. I just bought a Line 6 cabinet and when I went to plug in the Ampeg I heard a pop, and now it doesnt want to power up. I opened up the back and checked to see if I was getting power with a voltage meter, and everything from the fuse and power outlets are fine. I also made sure I had proper ohms, so I was wondering if anyone had some advice on what I could check for next or any kind of help, mostly appreciated.