Whats the difference between KT88, 6550, EL34, 6L6, EL84 tube types?
In order to keep the subject matter concise and relevant to FRYETTE amplifier designs, we’ll break these tube types down into 3 basic categories: High Power Output, Medium Power Output and Low Power Output. High Power Output: KT88, KT90, 6550 Although not widely used in the guitar amp industry, we find these to be ideally suited to players who want power punch and articulation. We use KT88s in a variety of configurations, mostly in pairs and quartets and in some cases, sextets. The KT88 is unique in that it behaves a little like a cross between a 6L6 and an EL34 with smooth silky upper harmonics and good bottom end clarity. They are capable of delivering 100 watts per pair and this is the typical application in which they are applied in the TWO/NINETY/TWO and TWENTY ONE FIFTY power amps and SIG:X head. They can also be operated more conservatively as is done on the PITTBULL ULTRA-LEAD and DELIVERANCE ONE TWENTY and in the DELIVERANCE SIXTY where they typically deliver about 60 watts pe
