One platinum matched quad (4 tubes) of rare EL84 6BQ5 Tungsram Hungary rebranded EI Yugoslavia made back in 70s, NOS NIB.
They are hi quality EL84 pentodes, made more than 40 years ago. Gray round plates, halo ring, copper grid posts. They can be used in all EL84 / 6BQ5 applications. You can find them also rebranded Siemens!
They are carefully matched by plate current and transconductance on my Metrix and Hickok testers from a big batch of same code tubes.