chipss36

Re: Dual 1073 style micpre & EQ in 1u
« Reply #80 on: November 01, 2019, 03:21:36 AM »
https://ibb.co/w0shygv
Looks like I am first.
Still working on the build, very impressive David.
Power rails are running fine, made a few changes to bom, solid shaft potmeters, center detent on cut boost pots, went all vishay 1813 on caps, becuse of ocd, still curve tracing transistors, have a few old bc184c’s
With good hfe levels.
All the new ones on bom, but ordered a few mpsa18’s, noise and gain on data sheet look impressive on them, want to test a few.
Still not sure what I will use yet.
« Last Edit: November 01, 2019, 03:28:55 AM by chipss36 »


Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #81 on: February 12, 2020, 10:37:59 AM »
Just stumbled on this project and though I don’t need another mic pre (I’ve got 48 channels already!). I can hardly resist.

Anyone experimented with alternate parts?  I see a lot of parts from the mouser cart not available, so it’s going to be multiple vendor orders anyway.

I have a 24v/48v power supply in an old gen 1 sca rack that has been on the garbage pile for years but managed to stick around. It would be perfect for this. 

Anyone who has completed a build please share your thoughts, or talk me out of this!

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #82 on: February 23, 2020, 11:22:31 PM »
Well, I'm all in for two channels of 73+.  Mind blown by the attention to detail.  How is this not everyone's project right now?  Rupert himself would dig this implementation.

Waiting on a ton of parts that are on the way but PSU and output trims done.




Ricardus

Re: Dual 1073 style micpre & EQ in 1u
« Reply #83 on: February 27, 2020, 10:05:51 AM »
Is this still available?
Audio mastering for hire..

kante1603

Re: Dual 1073 style micpre & EQ in 1u
« Reply #84 on: February 27, 2020, 11:12:11 AM »
Is this still available?
Hi Ricardus,look here:


http://www.thedonclassics.com/#rack-kits


Best regards,


Udo.

chipss36

Re: Dual 1073 style micpre & EQ in 1u
« Reply #85 on: March 06, 2020, 02:45:31 PM »
I need to finish this up, mouser in the USA was indeed back ordered on a few parts,  I left it all in back order so others many have them parts in stock, I also wanted all vishay caps so subbed some caps, transistors I am still
Not set on, I have some old nos that have much less gain than say mpsa18’s
Same with the 2n3055, I have curve traced what I have and am still not sure what in the end I will do,..

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #86 on: March 25, 2020, 03:22:41 PM »
Looks very nice chipss.  I decided that life wasn't difficult enough, so went about sourcing old mustard caps for mine.  It was expensive and tedious.  Anyone looking to do the same, I recommend avoiding anything rated above 160V.  Even the 160V parts are huge for the higher values.  I had to get creative and build in 3D.  I have two sets of boards, so I will do one with 1813s and compare.  I doubt there will be much actual difference.  Even with the vintage caps I was able to get them matched into pretty close pairs, surprisingly.  Also, I recommend you sand the leads a little and use plenty of flux.  Solder does not like to stick to old, oxidized leads at any temperature.

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #87 on: May 24, 2020, 02:38:15 PM »
I finally got the rest of the parts I was waiting on and finished this bad boy up.  I had to improvise on a couple of parts that just don't seem to be coming back in stock this year.  I decided early on to source all vintage mustards, underestimating the size of the larger values.  In hindsight, I probably wouldn't choose that path again.  MKT1813 are known to be analogous, easy to source, and fit perfectly.  I could not find a reliable source for BC184, so I use BC550 and BC549 throughout.

Design and fit of all these parts is damn near perfect.  I can tell David put a ton of time into the development of this project.   It's not cheap, or simple when all is said and done, but it's probably the best no-compromise Neve project I have seen.   No wiring!   I was going to try and get some vintage transformers, but they are going for just ridiculous prices now.  I can't imagine who is paying $500 for lo1166 but I wouldn't go over $300, and even then I'd feel a little bit taken.

The preamp sounds incredible, as does the EQ, as expected, but the one big surprise here is the DI.  It sounds amazing, and has quite a neve-esque air about it.  I plugged in my strat just to test it, and found myself loving the tone I got straight through my interface and focal solos.  This is my new favorite DI folks, and I barely took note that one was included when I decided to do this build.  I plan to do a second unit, this time with all modern caps.  David will sell you a second set of boards if you want to experiment with different types.  The modules pop in and out just like op-amps.  This will also make it easier to diagnose issues withe the amplifier modules themselves too.


Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #88 on: May 24, 2020, 02:40:55 PM »
The DI board close up
« Last Edit: May 24, 2020, 02:45:45 PM by Category 5 »

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #89 on: May 24, 2020, 02:42:33 PM »
I made a little 3d printed saddle and used some bus wire to secure the EQ switches.  Grayhill makes a fine part specifically for this task, but it is impossible to get, and stock is nowhere in sight.  This worked just as well, and IMO is not a compromise at all.


Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #90 on: May 24, 2020, 02:44:53 PM »
I also decided to print these little spacers to hold all the boards at even height.  David recommends soldering a few of the sockets closed for this task, but I chose a different approach.  Maybe I just really wanted to play with the new 3d printer.

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #91 on: May 24, 2020, 02:47:11 PM »
One more just because I love the look!