Good advice, thanks. Printed on the fuseholder is "300V maximum" so I think it's ok, but I will get the same fuses asap. In other news, a little arcy-sparky tonight when I stupidly tried to put the amp cover back on while the thing was running and caused a nasty spark on top of one the big caps. Huge "SNAP" and spark. No shock to me, but it was scary. Seared part of the PCB, too. But the thing is still running fine. That surprises me. I'm not so good with the electronics.