The G gauge 3/2 boards have a heat sink on the FETs and a remotely mounted rectifier (so it can be attached to a BF heatsink in the loco). The boards were modified to mount the rectifier on the PCB for use in O and Tinplate. The modified heat sink I was talking about is the bracket that attaches to the rectifier. It may not fit correctly because the rectifier is set too deep in the PCB.
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