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Internal linear power supply (updated from the original two-box design)
power supply design
the HD 820 uses Gorilla Glass ear cup covers with a concave design borrowed from reflector telescope technology to redirect sound reflections away from the driver
Audiophiles who want the SP3000's flagship audio performance in a pocketable package
SW1X PRE II Pre-Owned Internal linear power supply (updatedThe SW1X PRE II is a pure Class A, zero negative feedback line preamplifier with an Output Transformerless (OTL) power valve output stage, a natural extension of the SW1X DAC and LPU phono stage ecosystem, using 6V6GT power tubes to reduce output impedance and add authority, fullness, and dynamic expressiveness to any source connected before it. Type and Technology Line preamplifier with optional phono stage, single ended Class A vacuum tube. OTL
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