In my experience, the HP-180 scopes are still an excellent value. They don't
use impossible-to-obtain parts; are well designed and well built. The actual
bandwidth of the 180 mainframe is 100 MHz, and with the correct plug-ins
will make that number. Documentation is easy to find also.
Some Tektronix scopes still bring too high a price, and it may be difficult
to obtain replacement parts, because they are custom-made by TEK.
50 MHz probably is OK for your application. You also might consider the HP
1740 series of scopes.You also might look at the Philips/Fluke scopes. Whatever
you get, make sure that you can get the operating and service information.
I currently have a 200 MHz 4 channel Philips/Fluke, a 400 MHz Tektronix and
a portable Tektronix 100 MHz portable and a couple of HP scopes. Each has it
best points.
Stuart K6YAZ
Los Angeles, CA
