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RE: I thought that the KT77 is a beam tetrode...

But doesn't the pentode have an additional beam forming plate, so the the two aren't exactly the same; tetrode with four elements (cathode, control grid, screen grid and anode) and pentode with five elements, the fifth being the suppressor grid? If there are only four elements in a KT77, why would you want to call it a pentode? Do you believe the two function in exactly the same manner?
Open up your mind, in pours the trash. - Meat Puppets, 1987


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