N.U. 5Z4GT Vacuum Tube. For sale I have a new in original box National Union 5Z4GT/G vacuum tube. Tube carefully tested for emissions, shorts, gas, life and leakage. No tube is sold that has any gas, leakage or fails life and strength tests.
N.U. 5Z4GT Vacuum Tube. For sale I have a new in original box National Union 5Z4GT/G vacuum tube. Tube carefully tested for emissions, shorts, gas, life and leakage. No tube is sold that has any gas, leakage or fails life and strength tests.