Amperex 6DJ8 ECC88 Matched Pair Yellow Tip - HP Select - Holland 1961 GA0 - NOS

Perfectly matched & balanced pair of vintage HP Select Amperex 6DJ8 ECC88 audio tubes - Heerlen sound from 1961 - Super Strong NOS - Very Rare Tube Summary These are the legendary "medical tubes" made by Amperex Holland for Hewlett-Packard's medical devices distributed around the world. Each tube had to go through rigorous test and selection processes designed, implemented and monitored by HP. What you get is the best from the best candidates in build quality and low noise.  Sound Qualities Despite the HP label, you get the "textbook" Amperex Holland midrange presentation that is transparent, natural and expansive, with a slight touch of warmth that illuminates your musical world. The top end is super airy, smooth and nicely extended like one would expect from the best Siemens tubes. Vocals are intimate, sweet and forward (but not right in your face) and that always reminds me how the vocals sound on the best Mullard tubes. Bass is deep and well controlled and the accuracy fe