Signal Art Electronics U47 Vacuum Tube Microphone - Used  From Other

This listing is for the Standard Version U47 - however, the below description is for the PREMIUM Version, as there is no description available online for the Standard Edition:

https://www.signalartelectronics.com/product-page/u47-premium-edition

Our premium edition 47 is an elegant, open, detailed, clean, clear, rich, authentic sounding 47 microphone that we believe stands up perfectly well against microphones costing 2, 3, even 5x what we are asking.  Using nothing but the absolute best parts available and putting meticulous TLC into the build, the premium edition 47 is build to last a lifetime and create beautifully captured takes.  

The tube compliment is a matched pair of Western Electric 408a (6028) pentode valves that we have selected, cleaned (pin descaling), tested, and burned in.  We have tested every 408a variant out there over the years and to us, the Western Electric has the perfect balance of weight, presence, top end, and midrange.  It is neither muddy, nor bright and anemic, as some variants we have sampled.  To that end, we have invested in one of the largest reserves of this tube variant, to ensure a consistent product.  Each 408a is fitted with a custom tube damper ring made for us by hi-fi expert Sandy Levy using pure aerospace (high temp rated) silicon. 

We use mostly teflon coated silver hookup wire internally, and hand make both the 7 pin and 3 pin XLR cables using Gotham's finest cable stocks available from Gotham Audio LLC, the US division of the legendary high end cable manufacturer.  We include a premium hospital grade IEC power cable.

Our power supply enclosure is manufactured to our specs, and made twice as dense as most other power supply enclosures.  This box is practically indestructible.  Inside is a beautifully hand-wired power supply starting with a shielded, over-spec'd hospital grade toroidal supply transformer, fed by an over-sized and shielded Corcom AC input EMI filter, and made with our own lab-grade '47 PSU PCB and premium Nichicon and other long-life components.

For this premium edition, we use a custom wound BV8 transformer made in the USA.  This transformer is a true BV8 in every sense of the word, utlizing the same original winding technique and turns ratio as well as the same size UI30 laminations as the original German part.  The results are simply open, rich, and musical.  This part is based on a meticulous study of our own personal favorite vintage BV8 specimen.  It was prototyped many times until we matched the exact sonic character, bandwidth, tone, and THD profile of our favorite vintage German part.

With the premium edition 47, we also include an extra selected (noise graded, cleaned, and tested) pair of 408a tubes, and a handmade 6ft. IEC power cable using shielded Gotham AC power cable and Wattgate audiophile grade connectors.  We also include a custom made wood box for the 47.