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OPA2134 Opamp Preamp - Big Brass Knob
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My third Burr-Brown OPA2134 based preamp sees a sleek red die-cast aluminum case of two coats of epoxy paint and a sexy 4 oz brass knob. This build is based around the 1uf Jupiter Bees Wax and Paper caps. See other photos for more info. The first thing I notice when playing this preamp through my valve monoblocks was a dramatic increase in bass. The other obvious audio advantage is an increase in stereo focus. Not only is bass deeper (and louder) but there appears to be more layers to it. Voice sounds earthier and more immediate. A 26V 3.5A computer PS powers the unit but each channel has its own and separate virtual PS. Five 220uF low ESR caps store power directly on the cct. brds. A suspended wooden floor in the case provides a base to suspend the cct. brds on. Silver wire and silver solder is used throughout with an Alps blue velvet attenuator. Very impressive sound. The very best one I have made to date.
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