I just acquired my first Marshall, a 1978 MKII 100w head. It's kind of rough but it looks to be about 99% original inside. But I really don't know anything. So I'll be looking for info. Well I do know not to mess with the big blue caps! A couple things I'd like to find out about is, the cooling fan, is it original? And why All the other Marshalls I see have a black ink build tag? inside and mine has a red? I would also like to know what others think on modding old Marshall's or restoring, and how far to go? Any opinions, ideas, pointers, wisecracks are welcome. Thanks.