Hafler 9505 Specifications
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Amplifier
9505
CIRCUITRY
• All Discrete Circuitry
• JFET Front End
• trans• nova Amplifier Topology
• MOSFET Output Devices
• DIAMOND Driver Stage
• Internal Rail Fuses
• No Fan! Convection Cooled
CONTROLS & INDICATORS
• 5.25” Rack Mount (3-rack spaces)
• Stereo/Bridged Mono
• XLR or 1/4” Balanced Inputs
• Gold-Plated RCA Unbalanced Inputs
• Gold-Plated 5-Way Binding Posts
• Power Lamp
• Chassis/Float Ground Switch
• Rack Mount Handles
WARRANTY
• 7 Year Warranty
FEATURES
®
DESCRIPTION
The 9505 model sets a new standard of sonic excellence for professional
applications. Utilizing Jim Strickland’s JFET input/MOSFET output trans•nova
circuitry along with his brilliant DIAMOND driver stage creates the ultimate
balanced amplifier.
The TRANSconductance Nodal Voltage Amplifier
(patent #4467288) is a simple three-stage design
delivering unparalleled speed and accuracy. The
Dynamically Invariant Amplification Optimized
Nodal Drive combines the linearity of Class A op-
eration with the current headroom of a Class B sys-
tem, resulting in a significant advancement in the
art of power amplifier design. The sonic result of all
this unique technology presents a deep, wide sound stage with in-
credible musical transparency and detail.
Many so-called “balanced” amplifiers are merely conventional unbalanced
designs with a balanced-to-unbalanced converter (usually IC op-amp based)
preceding the power amplifier. The 9505, however, is a true differential input
power amplifier.
Starting with the much acclaimed trans•nova amplifier core, each (+) and (–)
port of the input differential stage has been buffered with a high impedance
buffer pair. This allows direct signal access to the differential amplifier, with-
out conversion to unbalanced form. Deactivating the balanced mode is ac-
complished via a rear panel switch that grounds the (–) balanced inputs,
effectively converting the amplifier to unbalanced operation.
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Series 9505
Power amplifier
True-balanced JFET input
MADE
USA
IN THE