3 Zenith 17CK3 Vacuum Tubes Valves NOS NIB Lot Of Three Tray 9P This tube has black plates

This tube has black plates

new in box Sylvania 5BC3 tested to spec on our Paul Hart-calibrated TV7/U

harp-shaped getters and anode radiators for cooler operation and longer tube life

They tested as follows: 55

Is it a Mullard

3 Zenith 17CK3 Vacuum Tubes Valves NOS NIB Lot Of Three Tray 9P This tube has black platesThes three new old stock, new in box Zenith 17CK3 tubes tested to spec on our Paul Hart calibrated TV7 U. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY