Charliegibbons

Thanks for all the help! Some great things to look into. First things first, the second part of my question was easily remedies when I tested the brand new lead I bought and found it was defective so I went and got it replaced today. There's a nice little example of Occam's razor in action!

Hi everyone I recently picked up an old OHM head, an old english company that used to make PA gear. This particular amp seems to be for bass/ keyboard however and while it's sounding great so far one problem is that whenever I power the amp on or off it makes a very loud crackling popping noise through my cab for a few seconds which doesnt seem to be dependant upon volume. The thing that i've found to negate this is to only plug my cab after the head has powered up and to unplug it again before powering down the unit. Any idea what might be causing the problem? Also, while on the topic the amp doesnt seem to work well with speaker cables and won't send a signal through one at all. A normal guitar lead seems to work fine however, anybody got any ideas?