vintageTEK · PI, P7, and PI 1 phosphors were al- so available in the 'T321. The stand- ard...
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vintageTEK · PI, P7, and PI 1 phosphors were al- so available in the 'T321. The stand- ard phosphor was changed to P31 in 1962 for higher brightness. The T321 became a T 3210 in
