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In this newly found 1969 line brochure, they have their flagship Astro-Sonic combo ($1195 list) that appears to have 25"? squarer tube - "295 sq.in." they say, not stating diagonal measure.
I once had an earlier iteration of the Astro-Sonic running (magnificent woodwork) - 23", rounder, with green escutcheon, pre 'MX500' tube series?. It had a warm yellow/red phosphor character and also had Auto Tint via a slide switch on rear thumbwheel presets. They couldn't have been too proud of the Auto Tint hiding it at the back?
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