DIY Mic Pre Kits, Lunchbox Mic Preamp Kits, Power Supply Kits

Hey Owel,

Just got the kit today! Looks great... and i couldn't help but break it open and start assembling.

I just wanted to verify... in the assembly manual you said:



That means that a DOA will fit even with those parts installed (minus the actual PDIP opamp)? Those parts will not affect the operation of the amp with the DOA installed, correct?

I would like to interchange monolithic and DOA's and compare, and i would like to do this in the easiest way possible hehe. Just wanted to make sure.

Also, there appears to be 4 spots for 10k resistors... R7, R16, R27 AND the unmarked 10K at the very top middle of the board. There's only 3 10k r's in the kit. Is one of those resistors not used?

Hehe ok last Q. There's two pads for the orange and yellow wires from the output transformer... does it matter which one i use?

Yes, you can solder Millmax pins on the board, remove the PDIP8 chip and the DOA chip will sit just fine on the Millmaxsockets. - This is the preferred method.

You have to remove the PDIP8 chip if you'll be using a DOA. The height of the PDIP8 socket and PDIP8 will prevent the DOA from mating with the millmax sockets.

By using option A: You can do your listening test, remove the DOA, and insert the PDIP8 and do your listening test again.


Option B is soldering the DOA on the board itself, and moving the other components that are inside the square silkscreen, outside.

See the latest PDF guide. (don't know if you have that one yet).

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Yes, just (3) 10K resistors in the kit... for R7, R16, R27.

The unmarked 10K at the top of the board (near the DOA outline) is the alternative location for R27 (the resistor inside the DOA outline) if you'll be using Option B to solder your DOA directly to the board.

Again, please see the PDF. More clearer instructions are on the latest PDF.

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They're unused. They go to the 4th pair of windings on the output trafo.

So you can just solder the orange and yellow wires there.

In fact, you can use it as a secondary output for the preamp! at -6dB less gain, 1:1 )

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Ahhhh ok great! Fired her up tonight with a bench PSU. It sounds great! I can already tell... this, coupled with a SM7b, will be my new go-to setup for rock vocals!

As always... great work, sir!

Cool! Glad you like it!

I think it's going to be great on a lot of sources.

What did you use? A DOA or the PDIP8 chip?

If you don't mind, do me a favor and send some buzz on PPro and/or Gearslutz.

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Um i just have the PDIP chip in there now. I don't have a 990 yet which i was planning on trying. I may try one of the 2520's i have kicking around... see how it compares.




Most definitely. I'll snap some pics and make a few recordings as soon as i can and try and help get the word out! Thanks again.