The variable power supply to an amplifier in an electrical circuit is dynamically controlled through the use of a lookup table responsive to one or more operating conditions of the electrical circuit. An input signal is amplified using a plurality of amplifiers by dividing the input signal into a plurality of inputs signals, amplifying the plurality of input signals with the plurality of amplifiers and combining the amplified output signals of the plurality of amplifiers into a single amplified output signal. The resist film is subjected to pattern exposure and development so as to form a resist pattern from the resist film. The first and second stiffeners are coaxially wound exterior to the proximal inner liner.