Just to be clear, this is a modification service where you send in your working microphone and I upgrade it and return it to you. Postage is covered for the US, for outside the US, I will invoice for actual shipping costs.
The 47jr is based on a modern and particularly neutral circuit design, intended to accept a wide range of capsules and to pass through all of the characteristcs of that capsule unimpeded. The subtle problems arise when putting a particularly voiced capsule into this circuit, such as a K47 or CEK12, that the peaks and voicings of the capsule are not softened by the circuit design any, and can become somewhat harsh. What is certainly true of a U67 or U87 and their variants where there is a defined pre-emphasis (capsule) and de-emphasis (circuit) exchange within the mic design, is true to a lesser degree still with other capsules.
In that spirit, I worked with my capsule designer to import a specifically designed ultra neutral and highly articulate capsule based around the K87 but with none of the pre-emphasis frequency boosts. The result is a much smoother, more extended and articulate microphone; but still with some degree of character reminiscent of a U87. If you are happy with the sound of your mic currently, don't change anything; but if you understand that it cannot really sound like a FET47 or U47 and would like to see what more it can be on its own merits, this mod could be for you. The result sounds like a mic that hits far above its price point.
WA 47jr modification
for an additional $40, we will include a 6 meter Gotham XLR cable.