Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly box
All tubes will be tested before shipping.
On a mutual conductance tester=GM
Either on Hickok models 6000/A,539C,752A,800,VT-7D/U,I-117 military tester
1. Complete visual inspection
3. Test for actual real-life mutual conductance (life) of the tube
(including any shorts leakage and gas)
5. Repeat all tests for accuracy on another tester
If you purchased multiple tubes, I will combine shipping cost depending on weight and package size up to 1 pound anything over please request to combined shipping PLEASE USE "ADD TO CART" when making your multiple purchases within my listings. When done it will automatic combined. |