[Milsurplus] Tektronix Oscilloscope 545

[Floyd Petri]

I have some questions about a Tektroxix Oscilloscope Model 545.  Just how 
old and obsolute are they?  Are they still good, useful and reliable?  Are 
they expensive and where can you get them?  Is it better to find someone 
with one to sell or buy from a business?  Most important is the plug in 
units.  Are they interchangable among different model oscilloscopes?  If I 
had some plug in units is there a better scope than the 545 that I can get 
to use the plug in units?  About what would I expect to pay for one?  I 
figure shipping will be a killer.

Floyd 
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