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Acknowledgment
The author wishes to express his appreciation to General Electric Com-
pany for their courtesy in supplying data used in the preparation of the
following curves:
6AM4 5840
6BY4 5844
12AU7 5899
12AX7 5902
5654 59655670 6005
5686 6021
5691 6072
5692 6111
5693 61125718 6134 6386
5719 6136 6414
5749 6137 6661
5751 6201 6679
5814A 6265 6829
ix
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Copyright 2008 for Phyllis K. Pullen, M.D.,
by Robert J. Legg