Amperex 6922 Preamp Tubes D-getter - HP Select - 1960 USA - Matching codes - NOS

Perfect matched & balanced pair of HP Select Amperex 6922 D-getter tubes - Made in USA in 1960 - Strong NOS - Super Rare Tube Summary These are the legendary "medical tubes" made by Amperex for Hewlett-Packard's medical devices distributed around the world. Each tube had to go through rigorous testing and selection processes designed, implemented and monitored by HP. What you get is the best from the best Amperex tubes in build quality, life span and ultra low noise.  Sound Qualities Among the greatest Amperex tubes ever made, the USA 6922 D-getter version is undoubtedly one of the most sought after by serious audiophiles. They are as sweet and airy as the Amperex Holland 6922's, with even better detail and very spacious sound stage, and the tone is smooth and absolutely grainless. Bass is deep and accurate but nevertheless well controlled and doesn't feel too punchy. Vocals on these tubes are a slightly more forward than their Holland counterparts and they sound very war