All photo evidence I see points to this date, and it's malfunction of Budman, as the day and reason that he began to use the Mc2500. Starting with this event, it was used up until around the middle to fall of 83 when another Mc2300 with a steal your face is seen as well as Budmans return. The thought was that maybe he had switched amps to get more power. Truth is he either blew up the output transistors on one side of Budman after the first solo of Minglewood, OR the Thermal Cutout switches cut the power to the amp until it cooled down. Excessive heat can cause both scenarios. Doesn't help that Budman man is a first year production Mc2300(1Y) that has fans that blow the air into the amp instead of out of the amp like later runs. Either way, this is the reason why we see the brief almost yearlong appearance of the Mc2500.
May not be interesting info for all, but for a GD Gearhead Geek like me, it is pretty cool.