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North Coast Music offers a replacement AC-50 slider board to correct this problem.
The AC 50 Mk III and Mk IV amp heads would typically have black Vox grill and use the later, "three field" Vox Amplifier serial plate, as shown at right.
This weakening has caused many of these slider boards to snap under the weight of the amp chassis.
Installing EL-34 tubes that are not rated to operate at the 460 plate voltage of an AC-50 can create premature failures.The "Big Box" cabinet also allowed the chassis to be mounted to a "slider board" for ease in service.To service the chassis, one only needed to remove six back screws, remove the rear panel and slide the chassis out of the cabinet like a drawer.The Mk IV replaced the 12AU7 tube formerly used in the first position of the preamp with a 12AX7.The higher gain offered by the 12AX7 preamp tube allowed the Mk IV to be both louder and more easily overdriven than previous AC-50 models.