Brand new, (2023 date codes) re-issue Mullard EL84 / 6BQ5 Premium Matched quartet (4) power tube set. These are custom measured by Electron Harmonix for a lower plate current (Ip) and transconductance (Gm) matching numbers. We further test each set with a (post factory) 24 hour burn in on an amplifier at our shop. ( Please note: iP #s on box can vary from set in photo).
