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!

letterbeacon

Re: Dual 1073 style micpre & EQ in 1u
« Reply #92 on: June 03, 2020, 12:36:32 PM »
It looks amazing - congrats!

Re: Dual 1073 style micpre & EQ in 1u
« Reply #93 on: June 04, 2020, 01:25:35 AM »

darkus

Re: Dual 1073 style micpre & EQ in 1u
« Reply #94 on: June 05, 2020, 01:55:03 AM »
One more just because I love the look!

Did you keep track what was the total cost of building 2 channels with the rack?

Category 5

Re: Dual 1073 style micpre & EQ in 1u
« Reply #95 on: June 05, 2020, 02:43:40 AM »
Thanks guys.  David at DON Classics did an amazing job putting this together.  I can't believe it's not more talked about on here.

About the cost, the mustards didn't help, and I made so many separate orders all over the place, it's hard to calculate but it's in the 2's, and maybe even close to 3k (USD).  It's well worth it though, if you ask me.  The boards and metalwork are very refined, and the modular design is a great idea, especially for experimentation and troubleshooting.  The look is just awesome, but the sound is fantastic.  This isn't DIY for the sake of saving a buck.  It's DIY for the sake of building something better than you can go out and buy.  I talked myself out of a pair of vintage lo1166 many times, but they are just so inflated now I don't think there's any value there.  You could easily spend 4K if you wanted vintage iron though.

There is an extra (hidden) mid band, probably up around 8k too, which is cool, and the 1084 HF band is a cool option.  It's really just a few extra caps on the main board, a grayhill, and a pot.  The DI, which David says he designed as he imagined RN would have done it, is something special as well.