The fragile sockets are the weak spot of an otherwise great amp. Your best bet is to buy the set of sockets direct and find a good electrical repair shop to fit them. I got a complete set of replacement sockets from Tag McLaren for £35. Local TV/electrical repair shop charged me £25 to fit them. Sounds sweeter than ever now. This is as opposed to £120 - £190 quoted from hi-fi dealers for supply and fitting of the sockets.