RAYTHEON Made in USA Rare Matched Pair JRP 5670 2C51 Valves Tubes JAN Military Spec With extra thick glass envelope, Triple mica and heavy plate construction, which all add to reduce microphonics Grey Plates, Rare Windmill Getters Fully Tested & Matched on Avo VCM 163 Unused, New Old Stock Supplied in Original Military Boxes |