AT Tuning
The AT kit uses a completely different principle to the Arbiter Autotune to achieve the same goal of single lug tuning. As a by-product it has a similar appearance, being lugless with large chrome rims.
The Autotune system is sometimes called the 'jam jar lid' kit, because of the way the whole rim screw down onto the shells. Folklore has it that Ivor got the idea for the AT 'Advanced Tuning' method from the high pressure exhaust pipe coupling on his yacht.
Here, each pipe (A and B) are widened at the ends to form a flange. These flanges are pulled together by the circular clamp, C.
In this case the clamp is tightened until the two pipes are pulled together firmly and form a gas tight seal. In the case of the AT drum, one flange is fitted to the wooden shell and the other flange is formed on the bottom of the tensioning hoop.
In this case the drum head keeps the two flanges apart and the clamp forces them together. By adjusting the tension on the clamp we smoothly and evenly adjust the tension on the skin.
