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EIA Vacuum-Tube Base Diagrams
Base diagrams correspond to the codes in "Base" columns of the tube-data tables. Bottom views are shown throughout. Base connections are abbreviated as follows:
BS - Base Sleeve NC - No Connection F - Filament P - Plate G - Grid PB F - Beam Plates H- Heater S - Shell IC - Internal Connection K - Cathode
Alphabetical subscripts indicate structures in multistructure tubes.
D = diode, P = pentode, T = triode, HX = hexode Subscript CT indicates filament or heater center tap.
Generally, when Pin 1 of a metal-envelope tube (except all triodes) is shown connected to the envelope, Pin 1 of a glass-envelope counterpart (suffix G or GT) is connected to an internal shield.
These tube bases are derived from the 2001 ARRL Handbook.
"Tube Bases for Visio" Copyrighted by RF Cafe 2003
Note: Numbers shown are NOT total page views; they are unique IP addresses for each 24-hour period (i.e., unique visitors). Typical page view counts are at least twice the reported unique visitor number.
RF Cafe Erie, PA (814) 833-1967
A Disruptive Web Presence™ GPS Coordinates: N 42°04.577', W 080°11.757'
