1973 Catalog recommends using the 1A5 instead of the W
Tektronix W Plug-in
This is a Tektronix W plug in - it is a High-Gain Differential Comparator with calibrated deflection factors
from 1 mv/cm to 50 V/cm and an astounding 20,000:1 common-mode rejection. As a differential comparator,
voltage measurements using the slide-back technique can be made with this unit. The high accuracy and
stability of the DC comparison voltage added differentially to the input signal makes more precise voltage
measurements possible than many other techniques. Using this mode of operation the W Unit has an equivalent
screen height of +/- 11,000 cm.