Our first product and entry level microphone is the most affordable true '47' you will ever see available. Made using our own custom made M7 capsule manufactured in the USA by Eric Heiserman, American made steel power supply enclosure, American made NOS tubes, American made transformer, American made hook up wire, and all wired and assembled by hand here in Baton Rouge, down to the high quality Gotham cables.
U47 Baseline Edition
Our most affordable mic and beyond a doubt the most affordable 'true' 47 you will ever come across, this mic is a solid, thoroughly thought out rendition of the original classic that may be a no-frills approach but packs an incredible sonic punch. Made using our own custom made M7 capsule made in the USA by Eric Heiserman (the same exact capsule used in our premium edition!), our very own custom wound output transformer made for us by AMI (and inspired by our favorite specimen of the original BV8 German part), NOS (new old stock) military grade paper-in-oil capacitors, NOS polystyrene capacitors, and a matched pair of NOS Western Electric 408a pentode valves fitted with a pair of Sandy Levy tube dampers made from high temp aerospace silicone. Our stock NOS tubes are cleaned, tested, and burned in at our lab.
Low price doesn't mean lower performance at Signal Art: the baseline edition 47 is in most respects as good as any other microphone we offer. The differences lie more in liberties taken with a few components to afford easier manufacture, which may venture slight further astray from a strict adherence to vintage specifications. For instance, the T47 transformer by AMI in Washington state is a BV08-style transformer that is spun on more modern and readily available laminations of similar size and property, and mounted to a PCB-pin bobbin for direct board-mounting rather than spot-welded to wire leads, making a great transformer that is simply far easier to build and thus more affordable. Sonically, it holds up quite well to the historic BV08; audibly, it tends to sound a tiny bit thicker/weightier/darker with slightly less air at the very top. Bear in mind these differences are slight, and in some situations we prefer the T47 to the classic part. No matter which version of the microphone we make, we never compromise on attention to detail and the quality of semiconductors, wire, and craftsmanship that goes into the product.
Our own power supply enclosure is made to our specifications here in the states by Collective Cases, using American steel, and uses a high quality Triad Magnetics toroidal transformer, fed by a shielded Corcom EMI filtering AC inlet.
Our 47 microphone body replica is sourced from a trusted US importer who assembles them in California from both US and Asian sub-components.
We make every cable for our microphones here in Baton Rouge, sourcing the highest quality available preminum Gotham microphone and tube microphone cable stock from Gotham Audio LLC, the official US division of Gotham Cable. We use Cardas silver solder and Neutrik style connectors.
Our imported custom K47 capsule is made to our exact specs in very small batches by a small overseas shop that we have worked closely with (almost daily) for many years. It is a K47 in the true sense of the word, meaning that it is a dual diaphragm, single brass backplate design, tuned to a polarization voltage of 63v in remaining true to the original 47 circuit. It is skinned with 24k gold sputtered, 6 micron, pre-aged (more than 20 yrs) NOS Japanese PET film (Mylar). We are very proud of how this capsule came out. It punches far above its weight and truly blurs the lines between the expensive handcrafted capsules made in small numbers and the oft-maligned world of mass produced capsules. Considering that large asian factories sometimes make capsules by the thousands, while master craftsmen make one a time; these capsules are made about half a dozen at a time in a very clean, small-lab environment, and carefully tested.
Our imported 47 box is custom made for us in Germany by a master box maker.