We’re excited to announce the release of a series of microphone modification kits that give you all the joys of DIY microphone building with none of the painful guesswork.
Search online and you’ll find dozens of incomplete and contradictory recommendations for component upgrades. But what all those well-intentioned DIY forum posts are missing is a comprehensive, tested, and tuned circuit plan.
Our FET mod kits were designed by audio circuit guru Jim Williams (of Audio Upgrades). Jim no longer performs commercial mic mods, but we’ve been able to capture the magic of his favorite mods in kit form. If you can drive a soldering iron, you can turn some popular inexpensive mics into serious pieces of studio gear. Because Mr. Williams performed hundreds of these mods over the years — including about a dozen for himself — he had the opportunity to develop, revise, and refine a specific recipe that yields an extraordinary sonic bang for the buck.
Our Apex 460 / Alctron T-11 mod kit was designed by Brian Fox of Fox Audio Research. Brian’s non-nonsense, test-driven approach to circuit optimization yields a fantastic upgrade for this popular tube mic.
We source all the best components, hand-select and match all the paired resistors and capacitors, and package them up with a detailed, model-specific, full-color installation manual. We want to make sure your mic fires up and sounds awesome on the first try.
Available Mod Kits
We have mod kits in stock for the following microphones. Click any mic photo for details.
Tube Mic Mods
Apex 460 Mod Kit: |
Alctron T-11 (HST-11A) Mod Kit: |
t.bone SCT 700 Mod Kit: (Coming soon!) |
FET Mic Mods
MXL 990 Mod Kits: |
MCA SP-1 Mod Kits: |
MXL 770 Mod Kit: |
MXL 2006 Mod Kits: |
MXL 990S Mod Kit: |
MXL V250 Mod Kits: |
MXL V63M Mod Kits: |
Order Mod Kits
To order microphone mod kits, click the specific model above.
Testimonials
FYI. I had never worked on a PCB before and I still tried the advanced mod. It went off without a hitch thanks to the clear instructions. And, the mic sounds incredible. Thanks.
Jim Heath / Reverend Horton Heat
Mod parts arrived yesterday and I installed them all already. All tested and working, and result is stunning! Thanks!
Djani Pervan
Received the kit yesterday and successfully put it all together. tested perfect!!! thanks for the awesome instructions and the super cool opportunity to modify my mediocre mics!! cheers , i’ll be ordering another kit soon…
Jason Morales
I bought your Advanced Mod Kit (plus RK-47 capsule) for an MXL 990. I am in no way good with electronics, but managed to get through all the steps and found it fairly simple with the included booklet. [I am] very happy with this; the mic sounds nothing like the piece of junk it was before… It’s smooth as butter!
Denis Normandeau
Just wanted to drop you a note to let you know how pleased I am with the mod kit. I just got my first microphone completed and it fired right up! The instructions were clear and easy to follow. I appreciated having the pictures handy for reference. Haven’t had a chance to do much testing with it yet but it sounds awesome so far. I’m really liking the RK-12 capsule too. Having a kit like this where all the hard work sourcing parts and having the circuit mods all mapped out was a great idea. Now I can’t decide if I want to record with my new mic or start on the second one!
Jeff Baxter
The mic powered up fine – no issues at all. I couldn’t do any qualitative analysis of it without having the full rig on – but it is quite a bit quieter than previous. So, the mod kit is great – there were no errors in it all. Well done!
Good call with the Rk47 capsule selection on my mic – love it… Quite frankly, it’s spectacular.Darren James Morton
I am very happy with the new revoiced sound… To my ears, it definitely sounds like a more refined and… well… more expensive microphone. I’m very happy with this mod and I’m very happy to recommend it to anyone with an MXL990 they want to improve. In fact, I’d say it’s worth buying an MXL990 with the express intention of getting this kit to modify it straight away.
Dave Boulden
Just did my first real recording with the RK-47 and Jim Williams mods, and it sounds great…
Thanks again, I’ll most likely be buying more from you in the future, and thanks for the personal attention….
Garvin Yee