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 KT88/6550 tubes Russia" is in sale since Tuesday, February 16, 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.