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About the HD Preamp
The Nagra HD PREAMP is a reference-class, two-chassis, fully tube-based line preamplifier introduced in 2017. It uses two independently regulated SuperCap power-supply sections and two Nagra-selected NOS E88CC tubes, with one triode input stage per channel. The design provides balanced and single-ended connectivity, selectable input-level modes, bypass/throughput functionality, record output routing, ground-lift controls, and Nagra’s signature modulometer. Nagra claims exceptionally low noise, very wide bandwidth, excellent phase integrity, and an unusually low output impedance. Published specifications vary slightly by source and test method; figures below distinguish manufacturer claims from independent laboratory measurements where available.
Specifications
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