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INTRODUCTION

 The “Conductance Curve Design Manual “ has been prepared to make
available to engineers, scientists, and technicians, a group of data
organized to help the user design circuits which function in the manner
desired, with a minimum of readjustment. It is divided into three
principal sections:

(1) a brief explanation of the special curves and their application
             in typical R-C amplifier designs.

(2) a set of tables useful in making tube  substitutions,  and  tables  to
             simplify the selection of tubes for given applications.

(3)  a special set of curves organized to facilitate tube circuit design.

  Chapter 1 describes briefly the forms of curves, and gives examples of
the use of the additional data. As the principal purpose of this Manual
is to provide data on the tubes, organized in a form which simplifies design,
a brief discussion of the different sets of curves is included here.

  Chapter 2  of the Manual  develops,  from  the  general  plate  current
equation for tubes, some of the more commonly used equations for both
triode and pentode  amplifiers. This discussion is intentionally limited
to several typical R-C amplifier problems as most of the design principles
are displayed in the examples. The use of the techniques on more complex
circuits can be readily deduced, or obtained from the appropriate
reference articles in the bibliography.

  Chapter 3 provides some typical design examples for both triodes and
pentodes,  showing the calculation of  amplification  and  distortion  and
the selection  of  bias.  In  addition,  the  problem  of  selecting  both  the
screen and cathode bypass capacitors is solved.

  The first of the two tables in the cross-reference data shows the
Manual  equivalents for several hundred common tubes, and includes
structure and basing data. The second table lists tubes for which curves
are included, and all their equivalents as provided in Table 1.

  The two power-handling tables, one for triodes and one for pentodes,
may be used  to  improve  operational  reliability.  These  tables  list  the
tubes in ascending order  of  plate  conductance  or  screen-to-plate  trans-
conductance.

  Tube curves themselves represent the characteristics of  71  tubes.  Low-
 
 
 

                                                                                                          v

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Copyright 2008 for Phyllis K. Pullen, M.D.,
by Robert J. Legg