2G11 Lampholder,4-pin Lamp Socket Connector for Fluorescent or LED Tube Lamp (Pack-2) - Amazon.com
Benjamin 4 PIN SUSPEND TWIST LOCK BAYONET BAKELITE TUBE SOCKET 00A 01A 12A 71A | eBay
Tube socket - Wikipedia
Sylvania 55W Long Twin Tube 4-Pin 2G11 Plug-In base 3500K fluorescent – BulbAmerica
Electronic Valve - RCA, Triode, Type WD11, circa 1922
2 Radio Tube Base Adapter(s) type WD-11 to UX four pin 99 01A 864 199 299 RCA GE | #2017792752
WD-11UX Adapters
Tube Sockets & Plugs - 4 PIN - Radio Daze LLC
1pc Gold plated 1A5/1Q5 TO instead WD-11 tube converter adapter | eBay
Vacuum Tube Socket 4 Pin, Brown Bakelite, Radio, WD-11 | #39664500
Benjamin 4 PIN SUSPEND TWIST LOCK BAYONET BAKELITE TUBE SOCKET 00A 01A 12A 71A | eBay
Substitutes for the WD-11
Vacuum Tube Socket 4 Pin, Brown Bakelite, Radio, WD-11 | #39664500
WD-11 - Wikipedia
Tube Socket: Most Up-to-Date Encyclopedia, News & Reviews
2G11 Lampholder,4-pin Lamp Socket Connector for Fluorescent or LED Tube Lamp (Pack-2) - Amazon.com
WD-11 Vacuum Tube Substitute
Tube Socket: Most Up-to-Date Encyclopedia, News & Reviews
WD-11 Vacuum Tube Substitute
1pc Gold plated 1A5/1Q5 TO instead WD-11 tube converter adapter | eBay
GE 13W 4 Pin G24q1 Neutral White Double Twin Tube CFL Bulb | F13DBX/835/ECO4P (4-Pin) | Bulbs.com
WD-11 - Wikipedia
List of vacuum tubes - Wikipedia
1920s Na-ald 2 in 1 WD11 or UV-201A 4 Pin Tube Socket SO-0055 - Etsy
2 Radio Tube Base Adapter(s) type WD-11 to UX four pin 99 01A 864 199 299 RCA GE | #2017792752
WD-11 vacuum tube base
Festo - NTSD-WD-9 - Plug Socket, angled, for valve mfld, 4 pin terminal, 250V, PG9 cable gland conn - RS
