skipwave

A couple new boxes finished. These both sound amazing, I'm very pleased, although the Jung-Markell stands out. In a brief test on acoustic guitar it really captured all of the natural overtones and harmonics that other preamps don't translate. The THAT1512 pre was close, very fast and clean, maybe just a touch bright sounding because of the speed and surgical precision of it.

THAT1512 pres on top, PCBs from mcs. Unbalanced outs, but plenty of room for add on balancing measures, thanks to Mikkel's great board layout. More people should consider these for a project, his kits are inexpensive and a quick build, despite the SMD gain setting resistors. I was proud that I only lost one (though I was scouring the floor at least three times for runaways), and easily subbed a regular leaded resistor.
Kits here, click "THAT Preamp":
http://electronics.dantimax.dk/Kits/Preamps_-_poweramps/index.html

Jung-Markell pre on bottom, my PCB design (and not a very good one at that, was difficult to work with). Jensen input transformers, Edcor outputs, with unbalanced output via switching jacks.
http://waltjung.org/PDFs/LT1115_Mic_Preamp.pdf





Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.


nielsk

That pre
« Reply #1 on: June 01, 2007, 07:11:45 PM »
Schematic for That pre?

skipwave

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #2 on: June 01, 2007, 11:42:38 PM »
Full details on the THAT pre in this thread:
http://www.groupdiy.com/index.php?topic=10417&start=30

And its evolution into a mixer design in this:
http://www.groupdiy.com/index.php?topic=19888&start=15

The THAT pre really does sound good, and the kit makes it a quick build. I hope people consider it along with the usual suspects for a transformerless preamp, like the GreenPre.

The Jung-Markell also delivers amazing quality for low cost and non-complexity. I might build another pair with Cinemag CMMI-2C, which are probably right on par with the Jensen and considerably less expensive. Although, it would be really nice if someone offers quality PCBs. I used one that I designed and had ExpressPCB make. It really made me appreciate the luxury of professional PCBs, with solder mask, plated through holes, and more spacious layouts.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.

SonsOfThunder

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #3 on: June 02, 2007, 12:56:04 AM »
Nice job, Skipwave!

Any project that gets finished and working is a GOOD project, imo.  And not a bad job for your first layout!  You should try home etching...that's a lot more "fun".

Peace!
"The sow would rather have her ear than a purse." - PRR

skipwave

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #4 on: June 02, 2007, 01:28:10 PM »
Thanks guys!

I plan to home etch some simpler designs, but the Jung-Markell pre really needed dual layer, ground plane construction. I came off overly critical of my PCB layout, it works well, I just wanted to preempt any requests for the layout, because it should be reworked a little. The Jung-Markell design really does sound great!

The 1512 is impressive. I'm thinking of adding the THAT1646 on the output, after reading about all the cool things Roger and Wayne are doing with it. For now I just run it to 6k-10k inputs.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.

mcs

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #5 on: June 09, 2007, 08:52:19 AM »
Nice to see my boards used in projects other than my own :grin:

Glad you like them!

I'm currently finishing the 10-channel mixer version...

Best regards,

Mikkel C. Simonsen

Randall Dibble

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #6 on: June 09, 2007, 06:31:54 PM »
Detail Please!

I have a gutted Yamaha MC1202 Case a waiting for a project of this type.

bigugly

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #7 on: June 09, 2007, 09:22:39 PM »
I noticed this post earlier today and figured since I didn't have anything else going on I'd design a PCB for the LT1115 pre.

Here is the schem and PCB:




If anyone notices a problem with these let me know and I will fix it. Any and all suggestions are welcome. I don't have the finances to get a batch made but I will post the gerbers and and artwork for anyone who wants them.

JL

I updated the images. I'm etching a prototype and ordering the parts. I'll let everyone know how it's going. Once I have it built I'll put it on the Neutrik A2 and see how it specs out. If everything is okay I'll put together an order for some PCBs if anyone is interested.
"...the land of the free*, and the home of the brave"
*some restrictions may apply, see Congress for details

pstamler

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #8 on: June 10, 2007, 02:41:50 AM »
You might try doing what I did on the Gamp supply board and am now doing on the Tri-Way supply board: put together a one-time group buy with other forum participants. The more people sign up, the cheaper each board is. That way we share the set-up costs.

Peace,
Paul

skipwave

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #9 on: June 10, 2007, 06:45:24 PM »
Bigugly - That layout looks pretty similar to mine, though better component distribution. I squeezed a pair of pres onto a small board.

Paul - I owe you special thanks for answering my questions in the original Jung-Markell discussion thread. I learned a lot from tackling this design.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.


New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #10 on: June 11, 2007, 03:31:09 AM »
Nice work Skip!  Can you post some samples?  i could host them if you email me a couple.

skipwave

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #11 on: June 13, 2007, 12:55:50 AM »
EDIT: Samples dumped, needed server space.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #12 on: June 13, 2007, 02:18:20 AM »
Thanks, that was quick!  2 small problems though..... both files are not dl-ing

Samuel Groner

    Z├╝rich, Switzerland
  • Posts: 2935
New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #13 on: June 13, 2007, 02:43:33 AM »
Quote
Here is the schem and PCB:

What's R3 for?

Samuel

bigugly

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #14 on: June 13, 2007, 04:10:51 AM »
Samuel,

I don't know. I really didn't study the schematic. I just copied it, from the pdf, verbatim into Proteus so I could make a PCB layout. I thought it was odd too, but I figured the original designers knew what they were doing so I left it in.

James
"...the land of the free*, and the home of the brave"
*some restrictions may apply, see Congress for details

skipwave

New preamp builds Jung-Markell and THAT1512 - Samples added!
« Reply #15 on: June 13, 2007, 11:47:04 AM »
Quote from: "guavatone"
Thanks, that was quick!  2 small problems though..... both files are not dl-ing


EDIT: Like I said; Samples gone.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.


 

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