09-04-2015, 08:22 PM
I own a 163 and having talked to other owners, their current condition seems to depend critically on the environment(s) they've lived in.
The gm meter on mine exhibits a low coil resistance and needs rather more than 50uA to get to go FSD and so I've adopted the well-proven solution of using an op-amp to recover the scaling. Also, the same meter has undergone a most peculiar form of corrosion on the plated (2BA ???) bolts which provide the connection out of the casing, those being covered in a white powdery material. Had to clean it off and cover them in Vaseline. In contrast, the meter on the LHS is perfect, which makes me suspect that one of them has been replaced at some time.
Cleggy
The gm meter on mine exhibits a low coil resistance and needs rather more than 50uA to get to go FSD and so I've adopted the well-proven solution of using an op-amp to recover the scaling. Also, the same meter has undergone a most peculiar form of corrosion on the plated (2BA ???) bolts which provide the connection out of the casing, those being covered in a white powdery material. Had to clean it off and cover them in Vaseline. In contrast, the meter on the LHS is perfect, which makes me suspect that one of them has been replaced at some time.
Cleggy
