Thanks for the response guys!
I really love the gk sound but seem to have no luck with their stuff., I have an old 2000rb that is one channel, (the other is toast)I bought it like that as a back up to my 2001.
I have the 4x12 which "grumbles" at low volume, it's fine when loud tho,
I also have an mb800 which is noisey
And the biggy.... 2001rb which is what I am really looking at getting sorted.
This thing blew, got repaired, and then blew again after being used twice. It has been through 3 different very highly regarded amp techs since, and they all say it's a pretty complicated/pain to work on. The last tech has spoken to gallien directly to source parts which totalled something like £800. Polar audio quoted me £15 per 15 minutes inspection time just to isolate the fault, then the price of the parts and a higher rate repair and then hefty return shipping, which was also cost prohibitive when you can pick a 2001 up for £500
No one seems to be able to repair this at a rate worth saving the amp and it's a damn tragedy to throw a 2001 in a skip.
Looking for ideas:)