I’m not sure sorry. Depends if the tubes were true flat style or the earlier Toshiba A68LBT696X or something else all together. I haven’t seen that chassis mentioned by people using them in Astro Cities through to Blast Cities. Though they look just like all those chassis. There’s an eBay ad showing it running on a flat crt. https://www.ebay.com.au/itm/1650208...apEstSXRAm&var=&widget_ver=artemis&media=COPY