EIA Vacuum-Tube Base Diagrams
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.
Related Pages on RF Cafe | - Tube Base Diagrams• Click here to order these tube bases in
- A Course in Radio Fundamentals-Vacuum Tubes
Sep 1942 QST
- Electrons on Parade
Tube Production Video by RCA c.1942
- NEETS Module 6 - Vacuum Tubes
- Vacuum Tube Vendors
• Virtual Valve Website
• The complete 1951 Sylvania Tube Catalog (15MB)
• Here are tube socket dimensioned drawings.