NOS NIB Philips Mullard (Yugo made) 1960's EL84- We recently aquired 100 pcs of these old production Yugo made KM4 Philips/ Mullard version of the EL84 branded as EI made in the 1960's with double getter supports and extra thick copper support posts. We have super tight matching on quads of this awesome sounding tube! Blows away any current production junk and should definately NOT be confused with the recent EI production of today! They will never be made to this spec again! Notice the thick copper support post and the identical structure to the 1960's Mullard Yugo made tube shown next to the EI! Perfect for Manley amps, and guitar amps! This is a suitable replacement for any 6BQ5 = EL84 = CV2975 = E84L = 7189 tube type. Various brands available.