so far i remember the astro comes with a curved toshiba tube like my old sega naomi . here in euroland i would check the market for an old 15k scart tv with toshi a68kju or kzn tube . or maybe a 29-27 inch semi curved philips . both will fit 100 % into the mounting brackets . the monitor bezel may not be 100 % snug , there might be a gap , but maybe a naomi semi flat bezel is working on the astro , i dont know for sure . sold my astro some time ago . those old curved 15 k toshis are very rare . i only know a few old grundigs with this kinda tube .
during my last year visit to canada i noticed they had lots of toshiba tvs with yuv input . i should have asked my bro if it handles progressive mode 640x480 60 hertz via yuv like some european tvs via vga input . i do have some vga tv to arcade pimp cabs with x1 , x360 and dc , but i dont like lowres on a 29 inch monster screen . lg ( philips ) could be another alternative . some of them are coming with vga input but flat tube .