Hi Kerry,

Contrary to what you might think from the e-bay listing, a Vectorscope is most 
certainly NOT an oscilloscope, and does not have X, Y, and Z 
(intensity/blanking) inputs. A vector scope allows one to visualize the color 
composition of (analogue) NTSC television signals. The input is usually a 
single composite signal. The 'vector' name relates to the fact that the _phase_ 
of the signal with respect to another reference is used to encode colour, and 
the vector scope lets you see those phase relationships. (Not a very precise 
explanation I admit!! :)

That's not to say you couldn't do a mod and tap into the X and Y amplifiers, 
and install a decent blanking circuit, but it might be a bit advanced. It would 
surely look nice, though!

I've been doing something similar with a Heathkit recently, over at 
http://oscilloclock.com (no plug intended). A future post will illustrate a bit 
more what needed to be done.

By the way, I LOVE vector scopes! I have a salivatingly valve-packed Tektronix 
529 Vector Scope, which I have mounted on a sliding and rotating rack in my 
shop - see http://oscilloclock.com/history/tektronix-529-vectorscope.

Cheers
Aaron

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