EAT KT88 Diamond Valve A KT88 tube that is in a league of it's own. This KT88 tube is available in factory-matched pairs, quads, octets and 16tets. It's construction features include black plates, black metal base, and gold pins. ...more Brand: European Audio Team Feature Option: Matched PairMatched Quad (+$1,000.00)Matched Octet (+$4,000.00)Matched 16tet (+$13,505.00) $995.00