Both are never used, factory matched. See last picture for readings. The item "Factory Matched Pair Electro Harmonix 300B Tubes Gold Pins Ceramic Base" is in sale since Saturday, April 24, 2021.This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "retroeman" and is located in Vallejo, California. This item can be shipped worldwide.