NOS Sylvania 6AX4GTB Vacuum Tube - White Box - Tested

Vintage Sylvania Electron/ Vacuum Tube 6AX4 TESTED With Photos!

SYLVANIA - NOS 6AX4GTB Electronic Tube - Tested STRONG

(3) GE 6AX4GTB electronic tubes With Boxes Tested Good On Sylvania Type 220

6AX4 GTB TUBE SYLVANIA TESTED & BOXED VINTAGE COMMERCIAL SURPLUS

NOS Sylvania 6S4A Vacuum Tube - White Box - Tested

Sylvania 6AX4GTB New Old Stock Tube, Hickok Tested PERFECT BRAND NEW

SYLVANIA 12AX4 GTB TUBE SINGLE NOS NIB MINT BRAND NEW IN ORIGINAL BOX