Hello Steve
Polar Instruments that used to manufacture the Polar T6000 have two left of the C.R.T's used on this impedance signature analyzer. The C.R.T. used was a AEG D7-233GY.
Have a look on this link:-
http://www.sphere.bc.ca/test/crts2.htmlThis company claims the D7-233GY is good for the Huntron Tracker.
If the price is right from Polar I may buy one of these tubes as spare for my still working Polar T6000.
The one useful feature on the PolarT6000 is "Beep mode".
You just set the tolerance and then can compare a known good PCB with a failed PCB without having to look up at the trace on the T6000. Makes comparing several test points that much quicker.
The T6000 beeps every time the tolerance goes out of the set tolerance.
Hope this helps.
Polar Instruments address:-
Polar Instruments Ltd
Garenne Park
Rue de la Cache
St. Sampson
Guernsey UK
GY2 4AF
Email:- martyn.gaudion@polarinstruments.com