One of the all times most fascinating DIY web sites on electronics, has to be The Lampizator. Lukasz Fikus has made it his mission in life to put tubes into every half decent sound producing device on this planet. I am not sure when this happened, but at some point he started deviating, crossing the solid state line and getting dangerously close to SMDs and other very much untubular things. This is not a bad thing. Not at all. For now Lukasz Fikus has given us an extremely detailed view into how to tweak some niftiness out of the Logitech Squeezebox Duet. If you are interested in real modding, do yourself a favour and pay this man a visit and enjoy his ongoing endeavours.