Tungsol 5881 is manufactured at the Sovtek factory in St. Petersburg, Russia.

A great alternative to the military spec Sovtek 5881 used in Fender Hot Rod Deluxe amplifiers (re-branded by Fender / Groove Tube). The Tungsol 5881 has a smoother sound and is less harsh on the top end. Certainly recommend trying these in Fender Deluxe amplifiers.

Add a Jensen P12N Alnico magnet speaker, and you have yourself a superior amplifier in tone and performance.