Amperex 4GK5 Vacuum Tube Valve NOS NIB Kapp 1008 Transconductance measured 28

Transconductance measured 28

Please note Tube Two’s centering pin is missing

79/77 where minimum (65%) is 50/50

Tube One (GE-MANUFACTURED

This trio of US-made 6X4 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Amperex 4GK5 Vacuum Tube Valve NOS NIB Kapp 1008 Transconductance measured 28This Amperex 4GK5 tube tested to spec on our Jackson 648 Mutual Conductance tester. 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 HAVE IT. PLEASE ALSO SEE