HP Select Amperex 6DJ8 ECC88 Preamps Tubes Matched Pair - Holland 1965 - NOS

Perfectly matched & balanced pair of vintage HP Select Amperex 6DJ8(ECC88) audio tubes - Heerlen sound from 1965 - Super Strong NOS - Very Rare Product 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. Manufactured and released only in limited quantity, these tubes are elusive to find and remain top choices of critical listeners and tube enthusiasts.  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