NOS 5687 "Kuhl Tube" Cryo Treated low-noise matched pair
Tungsol Black Plates "U" getter from 1950's rebranded Raytheon
These tubes have not been used.
https://www.tubeworld.com/kuhltube.htm$90 (cost >$150 from tubeworld.com) obo
payment via Paypal, buyer pays actual shipping
