One NOS NIB matched sleeve (set of 5) of Amperex (New York USA plant) E810F / 7788 Vacuum Tubes. The printed brand is Haltron but they have the classic Amperex USA EIA code of *. Gray plates, O getters.
* Quads are available - please order a quantity of "2" for a quad - make sure to email us first to check if the quantity in stock is less than 4 *
Tested and matched within 10% or less on a calibrated Hickok TV-7D/U. Fully guaranteed against any defects including noise or microphonics.