Don't get all hung up with advice about you having to have a digital oscillscope or having to buy a NEW scope. There are all kinds of high-end portable and laboratory-grade analog scopes available for pennies on the dollar from the on-line auctions. Bargains can be had. These scopes will generally run circles around all of the affordable digital scopes you can buy. Digital scopes offer some advantages over analog but I've been working without those "wonderful" features now for 40+ years and don't feel any loss. I own a Tektronix 7904 loaded with plug-ins, good for 500 MHz bandwidth and with the plug-in capability, can have all sorts of features a digital scope cannot such as semiconductor curve tracer, spectrum analyzer, logic analyzer, etc. and something like I have is going for under $500 in many instances -- a system that in 1997 would cost in the area of $20,000. Be smart, look at all the possible angles, prioritize on different items of test equipment and spend your hard-earned money wisely.