I imagine the poster means; http://microphone-parts.com/
Great site & service. They do have stuff go out of stock, but last time it happened, they gave me a discount coupon. I bought my RK47 capsule from them, and it was a great investment for my SP1 mod.
Thanks to player1 for the compliment! This thread has actually turned into a time investment, but it's given back some nice returns as well, in the form of input from the pro modders and builder community.
You're not alone in your confusion! There's tons of info, some contradictory, and very scattershot. I really just wanted to figure out what the best and most cost effective options were for upgrading the SP1, create a BOM and process, and let others have at it here at GS. My aim was to create a known path for folks to use when they mod this mic. If the interest continues, I would welcome a third party mod kit! I've kind of moved into trying to get a deeper understanding of the circuit, and how it works, beyond just trying to improve a cheap mic. I hope to eventually create some of my own designs and mods, based on the info gleaned digging into the SP1.
What's really interesting is the variety of info out there on the base designs of this circuit. Zapnspark recommends taking out the C13 capsule to FET cap entirely, along with the R5 resistor and a couple of other parts. Other modders retain the FET cap, but upgrade it.
I'd love to see more informed debate in this thread from the pro modders and builders on this design, and the variety of ways to make it work well. A mod kit could take any direction, as evidenced by the numerous approaches to modding this mic. Keep it coming!