Size of Board: 52mm WIDE x 41mm HEIGHT (1590B Box Ok!)
The slashed part are changes needed to build RC.
For AC, use 2 diodes in RV and 1 in FW clipper group.
For RC, use 3 diodes in both RV and FW clipper group.
Transistor in the original unit is 2SC1815 (view from top, left to right = ECB)
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