This beam power tetrode can be used in place of 6550 and KT88. Sounds like great big EL34.
The price applies to one tube.
To get matched tubes you must order the number of tubes that you need and select the needed matching-option. For example: to get two quartet you must order 8 tubes and select the "quartet" matching. If you need a pair then order two tubes and choose the "pair" selection.
