[Elecraft] [KPA500] incredible hum from PA

[kevino z]

Just got my KPA500 and KAT500. I hooked the PA up to 240v (well, my Mains are 248v), so I made sure the assembled PA has the yellow transformer tap, from the factory.
When I engage the amp, there is a crazy buzz. I use a KPA500 at work, but it is on 120v and I never hear this buzz. Before I swap fuses, and switch over to 120v to test, does anyone else have this issue?
The KPA500 is hooked up to a KX3/KXPA100 combo, just in case someone would ask.
Thanks
-Kevin (KK4YEL)


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