PLATINUM Matched Quad (4) Electro-Harmonix 6973 tubes. Are perfectly matched on plate current (IP: 52.0). Each tube is burned in for 24 hours. Welcome to Tube Maze Store.Here you will find a wide selection of NOS and reissue tubes. All tubes are also tested for noise and microphonics. The item "PLATINUM Matched Quad (4) Electro-Harmonix 6973 tubes Russia" is in sale since Monday, July 12, 2021. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "tubemazestore" and is located in Melrose, Florida. This item can be shipped worldwide.