These are pretty good shots of this beast from an Ebay ad in which it did not sell. I have no connection with this, but I messaged this gentleman named Phil to get permission to post his pics. I am the happy owner of a Spectral DMC-6-II, so I am a huge fan of Spectral gear. Notice how externally, it kind of looks kike the DMC-20. It is like they started with that look, abandoned it for a few years, and then come back to it.
This is a short, but very interesting read.
This is a direct Quote From the Spectral Audio website:
The MS-ONE Preamplifier
The debut showing of the Spectral design philosophy. The MS-ONE was initially developed from an instrumentation preamplifier to investigate new devices and circuit topologies as a lab and review reference. Enthusiastic demand from those who heard it resulted in its going into production in 1977.
*First high speed audio preamplifier featuring DC-to-megahertz signal envelope.
*First preamplifier to accept a low level moving coil phono input directly with no additional gain stage. This required pushing device performance to reduce noise and increase gain to unprecedented levels.
*First solid-state dual monaural preamplifier.
*First ultra-close tolerance RIAA equalization components. Custom made to Spectral's specifications, these capacitors and resistors were from 10 to 100 times more precise than any used before.

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This is a short, but very interesting read.
This is a direct Quote From the Spectral Audio website:
The MS-ONE Preamplifier
The debut showing of the Spectral design philosophy. The MS-ONE was initially developed from an instrumentation preamplifier to investigate new devices and circuit topologies as a lab and review reference. Enthusiastic demand from those who heard it resulted in its going into production in 1977.
*First high speed audio preamplifier featuring DC-to-megahertz signal envelope.
*First preamplifier to accept a low level moving coil phono input directly with no additional gain stage. This required pushing device performance to reduce noise and increase gain to unprecedented levels.
*First solid-state dual monaural preamplifier.
*First ultra-close tolerance RIAA equalization components. Custom made to Spectral's specifications, these capacitors and resistors were from 10 to 100 times more precise than any used before.

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