Is this correct and 100 w vs 50 w are different or is it the years that are different? Ive never seen a 74 100w wiring to know.
I have a 74 50 watt that has the newer selector rotoray on the back and I assume its wired properly at 4 = yellow, 8 = green, 16 = grey. In the case of converting 480 volts to 120 volts, a step-down transformer would be used. From everything I have found this is wrong but Im wondering if there is a reason someone would have done this? It was serviced by plexi palace years back and its hard to think this would be overlooked. Black or black with stripe AC mains input. A step-up transformer increases the voltage from the primary to the secondary coil, while a step-down transformer decreases the voltage. So when you hook it up you get 4 = green, 8 = yellow, 16 = black. On the inside it is wired just like the 72 but on the back, the selector switch numbers for 4 and 16 appear to be scratched off and swapped with new writing. Someone has resoldered the connections at some point but it appears to be right. I have a 72 100 watt that seems to be correct at 4 = black. I am trying to find answers on vintage marshall color codes for OT to make sure my amp/cab is matched.
