[Elecraft] Recomendations on Oscilloscopes

[Doug Person]

I have no formal electronics training. just what I learned along the way 
as a ham for 45 years.  I am interesting in learning about and how to 
use oscilloscopes.  I would like to learn how to trace and debug digital 
as well as analog radio circuits.

I'm have an old Elenco 1251 dual-trace 20mhz.  No idea how well it works 
or how well calibrated.  I was thinking of finding something a little 
newer and maybe better bandwidth.

Any recommendations on a good used scope?  Any thoughts on any books 
that might provide a useful overview of using a scope to debug rf and 
digital problems?

Any assistance gratefully appreciated,

73, Doug -- KØDXV