VACUUM TUBE ~ 1K3 ~ ZENITH ~ Tested Good In B&K 625

NOS Zenith 1K3 Vacuum Tube - White box - Tested

(2) Zenith/Silvertone 1K3 Vacuum Tubes Tested

Zenith 25HX5 Vacuum Tube NOS in box TESTED @100% on B&K 700 Tester Made in Japan

Zenith 19CG3 Vacuum Tube NOS w/box TESTED @ 104% on B&K 700 Tester Made in USA

Zenith 17CK3 Vacuum Tube with box TESTED @ 88% on B&K 700 tester

Vacuum Tube Zenith 1j 3

Zenith 17AX3 Radionic Vacuum Tube NOS TESTED @ 92% on B&K 700 tester Made in USA