BS 448-2:1981

This standard BS 448-2:1981 Dimensions of electronic tubes and valves is classified in these ICS categories:

• 31.100 Electronic tubes

This Part of this British Standard covers such physical requirements of the bases, caps and outlines of electronic tubes as are necessary to ensure mechanical compatibility and satisfactory electrical contact. Associated gauges and pin straightening tools are also covered. This standard deals only with electronic tubes registered in the United Kingdom and not covered in BS 448-1.

Owing to the many variables involved, including tolerances on pin diameters and permissible pitch circle eccentricity, it is not practical or economical to ensure complete compatibility in isolated cases where many component parts are on extreme opposing limits.

The standard is divided into four sections. Section 1 specifies general requirements for bases and associated gauges and pin straightening tools. Sections 2, 3 and 4 contain data sheets specifying the dimensions of caps, bases, outlines and associated gauges and pin straightening tools.

Appendix A, Appendix B and Appendix C identify which Part of BS 448 deals with which particular component.

Data sheets give drawings and dimensions of bases, caps and associated gauges and pin straightening tools for those electronic tubes registered in the United Kingdom.