cromwell

Re: MXL 603 -> KM84 Replacement PCB
« Reply #20 on: August 29, 2019, 05:22:30 AM »
Hi there, are those pcbs available and does anyone know if they fit into the t.bone SC140?

Cheers

Eric


benqbasic

Re: MXL 603 -> KM84 Replacement PCB
« Reply #21 on: August 30, 2019, 03:07:10 AM »
Hi from Auckland  :)

Strick9

Re: MXL 603 -> KM84 Replacement PCB
« Reply #22 on: November 20, 2019, 01:34:57 PM »
Are these PCBs still available?

Re: MXL 603 -> KM84 Replacement PCB
« Reply #23 on: November 26, 2019, 12:56:39 AM »
Hi,

Are these pcb’s available?

Thanks,

Kris

GraemeWoller

Re: MXL 603 -> KM84 Replacement PCB
« Reply #24 on: March 10, 2020, 06:05:20 PM »
Good morning everyone.

I'm sorry about the long quiet stretch, there's been a bit going on, but I'm above water now and I have new stock of the MXL KM84 PCBs ready to go. It's a wonderfully simple circuit to DIY, and a great way to add a little extra spunk to any 603s you have around. (Plus it's fun).

Those who have already PM'd me have received messages directly letting you know what's going on.

Hit me up if you're keen on getting a board or two.

Rock On!

G

GraemeWoller

Re: MXL 603 -> KM84 Replacement PCB
« Reply #25 on: March 20, 2020, 11:39:57 PM »
Hey everyone,

I hope you're all keeping safe and healthy where ever you are in the world. This thing's having such a huge impact all over, and I hope you're all ok.

I just wanted to say a big thanks to everyone who's been interested in the PCBs so far, I really appreciate it and it's been a wonderful vote of confidence in my little project. Thanks!!  :D

Stay safe everyone!!

xx

G

GraemeWoller

Re: MXL 603 -> KM84 Replacement PCB
« Reply #26 on: May 04, 2020, 09:17:20 PM »
Gidday folks,

Life is returning back to normal here in New Zealand, (our people have done a really great job of keeping us safe over the last month and a bit), and the post office has opened up for service again. If anyone is interested in getting one of these KM84 MXL 603 replacement boards I can finally start getting them out to people.

I hope everyone is in the safest of situations, I know there's so much weight on everyone's lives right now, but stay safe in whatever space you're in. Keep well!

xx

G

JerryPbury

Re: MXL 603 -> KM84 Replacement PCB
« Reply #27 on: March 07, 2021, 10:37:11 AM »
I am looking for a pair of these boards.

JerryPbury

Re: MXL 603 -> KM84 Replacement PCB
« Reply #28 on: March 12, 2021, 07:02:42 PM »
Graeme, any reason why you changed C4 from 1uf to 4.7uf?

Re: MXL 603 -> KM84 Replacement PCB
« Reply #29 on: March 13, 2021, 04:14:14 AM »
Graeme, any reason why you changed C4 from 1uf to 4.7uf?
These were draw mistakes, C4 and R4 drain resistor, hopefully corrected to original schematics.


GraemeWoller

Re: MXL 603 -> KM84 Replacement PCB
« Reply #30 on: March 13, 2021, 07:35:23 PM »
"Graeme, any reason why you changed C4 from 1uf to 4.7uf?"
Hi Jerry, yeah the reason I originally changed C4 is because I had a bunch of 4.7s and no 1uf on hand when I was testing this circuit out. I poked the 4.7uf in there as a stop gap in the early days and found no audible difference so it's stayed that way.

"These were draw mistakes, C4 and R4 drain resistor, hopefully corrected to original schematics."
Nope, C4 wasn't a mistake, it was a choice for the reason above. BUT, I'd encourage anyone who wants to change it out with the original value to give it a go. It's no extra effort, or confusion, and I'm always super-happy to hear about what other people have noticed and heard. Please post up your observations if you have any.

I'm not sure what you mean about R4 though. That hasn't changed from the Neumann schematic. Could you flesh out your thoughts on R4 for me, please?

Re: MXL 603 -> KM84 Replacement PCB
« Reply #31 on: March 25, 2021, 03:54:54 AM »
Yes, not so mistake,  C4 must be large enough to hold the voltage across itself constant at audio frequencies so the signal passes on to the transformer primary.

GraemeWoller

Re: MXL 603 -> KM84 Replacement PCB
« Reply #32 on: March 25, 2021, 09:15:29 PM »
Yeah, certainly haven't had any issues at all. :)

JerryPbury

Re: MXL 603 -> KM84 Replacement PCB
« Reply #33 on: April 06, 2021, 08:33:41 PM »
I got a couple of these from Graeme and they have become foundational mics for my studio.

In the us, you can buy mxl 603/991 for $30 really easily.  I ended up with 6 or 7 of them and did the “gus” mods that were popular years ago.  All of the capsules are different, and some of them are much better than others.

The gus mod sounds pretty good.  The km84 pcb with a cinemag sounds noticeably better. 

I ordered 4 capsules from 3u audio, and those sound way better!  In fact, a head to head comparison with my real km84 revealed that on some sources they were indistinguishable, and on others they had a different flavor, but were still really good sounding.

I’ve been using the 603 with graeme’s boards, cinemag transformer and 3 u capsule on toms and acoustic guitars, and they are really awesome on both.  On toms I love how the leakage is natural and not that crappy dynamic kind of annoying leakage you have to worry about.

What did you have to do to the 603 to get the 3U capsules to work?


 

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