Well, I decided I couldn't handle the noise anymore, and decided to try to ground the leads to the amp. I am pleased to say that it worked a charm :) The empeg now sounds perfect (well, as perfect as it can, since I economised by only replacing some of the original speakers - until next payday anyway!)
I will have to make a few more adjustments to the amp's gain, because they tried to compensate for the interference by boosting the amp and lowering the gain on the empeg, so right now it's deafening me with the empeg's volume set at about -20dB :)
Oh well, I'll let them know next time I see them, and they can do better next time - live and learn :)
They asked if they could take a picture of the empeg to put on their website, as I told them mine was the first (and still the only?) empeg in Northern Ireland :)
Geoff
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Reg No. 554, s/n 00064 - It's mine I tell you.... all mine :)
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Geoff
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Mk1 Blue - was 4GB, now 16GB
Mk2 Red - was 12GB, now 60GB