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With GE, who knows! They already had the solid state "XB" chassis out. The XB chassis was around from around '73 until the early '80's. Your tube chassis was probably kept in production as a means to use up existing parts and was likely a cheaper set than the solid state sets. The same basic portacolor chassis design was in use from the beginning (mid '60's) until the end of the portacolors. The portacolors are confirmed to have been made as late as '78 and rumor has it that they were being made as late as 1980. GE was the master at getting by on the cheap.
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