BS 448-2:1981

Foreword
Cooperating organizations
Dimensions
Section one: General
1. Scope
2. References
3. Definitions
4. Drawings and dimensions
5. Pin (or contact) numbering
6. Pin soldering
7. Resilient pins
8. Tolerances on pin position
9. Gauging
10. Gauges and pin straightening tools
11. Function of spigot and key
Section two: Drawings and dimensions of electronic
tube caps
CT4
CT5
CT6 (screw type)
CT9
CT11 (cavity cap)
Section three: Drawings and dimensions of electronic
tube reference line gauges for CRTs
RL1
Section four: Drawings and dimensions of electronic
tube bases
B2D/1.1 (base)
B3G/1.1 (base)
B3G/2.1 (outline, without top cap)
B4A/1.1 (base)
B4A/1.2 (base pin and wafer slot position gauge)
B4B/1.1 (base)
B5/1.1 (base)
B5/1.2 (base pin position gauge)
B5A/1.1 (base)
B7/1.1 (base)
B7/1.2 (base pin position gauge)
B7D/1.1 (base)
B7G/D/1.1 (base)
B7G/D/1.2 (base pin position gauge)
B7G/F/1.1 (base)
B7G/F/2.1 (tube outline, without top cap)
B8F/1.1 (base)
B8F/1.2 (base pin and spigot position gauge)
B8F/1.5 (base contact ring gauge)
B8F/1.6a (base contact spigot gauge I)
B8F/1.6b (base contact spigot gauge II)
B8-MO/1.1 (Mazda octal base)
B8-MO/1.2 (Mazda octal base pin and spigot position
            gauge)
B9/1.1 (base)
B9/1.2 (base pin position gauge)
B9A/D/1.1 (base)
B9A/D/1.2 (pin and tubulation gauge)
B9A/D/1.3 (pin straightening tool)
B9A/F/1.1 (base)
B9A/F/2.1 (tube outline, without top cap)
B12E/1.1 (base)
B12F/1.1 (base)
B12F/1.2 (base pin position gauge)
B12J/1.1 (base)
B12J/1.2 (base pin position gauge)
B14B/1.1 (base)
B14B/1.2 (base pin position gauge)
B14E/1.1 (base)
B14E/1.2 (pin and tubulation position gauge)
B14E/1.3 (pin straightening tool)
B15B/1.1 (base)
B15B/1.2 (base pin position gauge)
B19A/1.1 (base)
B19A/1.2 (base pin position gauge)
B23A/1.1 (base)
B23A/1.2 (base pin position gauge)
B24A/1.1 (base)
B24A/1.2 (base pin and spigot position gauge)
B26A/1.1 (base)
B26A/1.2 (base pin position gauge)
B26A/1.3 (pin straightening tool)
Appendices
A. United Kingdom coded caps
B. United Kingdom coded reference line gauges
     for CRTs
C. United Kingdom coded bases

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.

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.