Added another 7603 to the fleet today


When I got it back to the shop and looked at the SN, was surprised to see EX-3. I have a number of prototypes/lab mules that start with A or B, or E, but not with EX. Can anybody shed any light? The plug in's all appear to be regular production, 7A12, 7A26, and 7B71. Fires up, but the usual dirty pots and switches. One board at the top has a bit of water damage, already going at it with Iso and Q-tips.

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