The Electro-Harmonix EF86 is a later entry into the valve market and was designed as a low noise pentode. This is unusual used a as pre-amp valve and unusually is a small pentode
The first EF86’s arrived on the market in 1954 . It is manufactured in Russia and is a very durable valve. This is a faithful up to date version of the EF86 of the 1950’s.
It is fully tested by us and has a 120 day warranty.