Tung-Sol KT150

The ultimate Octal Beam Tetrode, with 70W plate dissipation. Most powerful tube in the 6550/KT88/KT90/KT120 family, developed to improve thermal dissipation and maintain a superior vacuum for the best sound. Impervious to overload when used at parameters found in existing 6550/KT88/KT90/KT120 circuits.

See matched version: https://shop.ehx.com/item/KT150TUNGSOL%20PL

Tube Specs: http://shop.ehx.com/catalog/tubes-specs/KT150%20TS.pdf