There is a 250 here: Refurbing an old school classic Orion 250 HCCA x2!!! - Amp Guts - A Car Audio Enthusiast Forum | SMD | Meade916 that has a blue board if that helps?
This whole Orion old school and vintage amps id stuff is extremely mixed up.Has anyone seen anything other than red circuit boards in any of the orion HCCA amplifiers?