Methods of forming sintered valve metal are described. The protection constituent is used to protect a silicon nitride and its concentration is between 0. This prevents any malfunction caused by output noise generated during the data sense operation of the sense amplifier. The system and method taught can be applied to other data networks where performance guarantees are important. Handrails may be provided on either side of the platform, forward of the platform, and adjacent the ladder for stabilizing the operator during servicing of the implement.