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MEHSA
(Maximum Efficiency HeatSink Application) MEHSA is a proprietary process that yields up to 5 times better heat
transfer than traditional FET mounting techniques using the exact same components. A multi-layer insulated metal
substrate operating with minimal thermal resistance spreads heat both downward and outward to quickly dissipate
heat from each device across the heatsink. This process combined with our DSM technology and MOSFET devices
allow us to squeeze more watts per cubic inch from every output device as well as provide consistent thermal sta-
bility.
The MEHSA Way The Old Way
THE RESULT: Better reliability through faster heat dissipation.
Trans•ana
Trans•ana (TRANSconductance Active Nodal Amplifier) is a circuit that allows the audio signal to pass through the
amplifier at low voltage. The signal is directly level-shifted to the fixed high voltage rails via a pair of driver tran-
sistors. Signal linearity is assured by an active node formed by the driver transistors at ultrasonic frequencies. This
allows amplifier performance similar to Trans•nova which is highly stable and linear while utilizing the advantages
of a non-floating power supply.
THE RESULT: An extended frequency band width accurately supplied to the output stages of the
amplifier.
MOSFET Devices
HAFLER is one of the few manufacturers in the sound community to utilize MOSFET devices in both the power
supply and output stages.
MOSFET (Metal Oxide Semiconductor Field Effect Transistor) devices offer several
important inherent advantages over the 30-year-old technology of bi-polar design. These advantages include: ther-
mal stability, fast switching speed, ultra low output impedance and wide bandwidth linearity. In addition, MOSFETs
operate very similarly to vacuum tubes in that they are more linear than bipolar transistors. However, MOSFETs
can deliver the midrange clarity without the limitations of transient response and high frequency phase shifting
normally associated with tube operation.
THE RESULT: Thermal stability, fast switching speed, ultra low output impedance and wide bandwidth linearity.