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Oh that is a Very Good Set. It looks like an 1981 model.
These System 3 have Tri-Focus Picture Tubes on both of 19" and 25" models.
The Tri-focus picture tubes uses two differnt focus voltages. The picture quality are super sharp.
I have agreed with the ad (National Geographic) that the zenith sets gives a 25 % sharper than Ordinary sets.
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