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DBX 386 mic pre mods
Old 6th November 2007
  #1
Lives for gear
 
Chris Parsons's Avatar
 

Thread Starter
DBX 386 mic pre mods

Hello,

What could I do to my DBX 386 to make it sound less "consumer"? I figure I can change the 12AU7 tubes to something better. What about opamps? Has anyone ever modded one of these and gotten good results?

Thanks,

-Chris Parsons
Old 6th November 2007
  #2
Gear nut
 
soundeziner's Avatar
 

I've got one in my portable rack. Let me know the results if you decide to experiment with it.
Old 7th November 2007
  #3
Lives for gear
 
Chris Parsons's Avatar
 

Thread Starter
So should I mod the DBX or sell it off?
Old 8th November 2007
  #4
Gear Addict
 
HoPMiX's Avatar
i have one. It stopped working after about a year and a half. I just have it sitting in the rack as a spacer. JUNK
Old 8th November 2007
  #5
Lives for gear
 

i've got one here and love it... i've never really considered modding it... anybody got a schemo for this puppy????
Old 6th June 2009
  #6
Gear interested
 
reypina's Avatar
 

update?

Has anyone found any info on modding the 386 or done any experimenting? I've been searching all day for info with no luck. It seem strange that there is no info on a mod for this piece. Has anybody gotten their hands on a schematic?

Any info would be greatly appreciated.
Old 7th June 2009
  #7
Lives for gear
 
Stitch333's Avatar
 

The starting points I'd use would be:
-tube upgrade
-IC upgrade
-audio path component upgrade
-transformer balance output

Some of this can be done without schematics, some only with.
Tho I can pretty much smell the "tube"esque starved plate design with haze and mud everywhere to begin with...

Sell that box and build a couple of Hamptone pre's
Old 7th June 2009
  #8
Gear maniac
 
mildav's Avatar
 

dbx 386 is nice pre for the price....i considering to change tubes.....a friend of mine changed the chinese tubes inside with the mesaboogie 12ax7 and the result is best agressive sound
Old 8th June 2009
  #9
Lives for gear
 

Quote:
Originally Posted by Stitch333 View Post
Tho I can pretty much smell the "tube"esque starved plate design with haze and mud everywhere to begin with...

what this really smells like is the common misconception often associated with dbx by the ill informed....

there's 200V on that tube.... dont want to beliene it??? grab it once....tutt
Old 8th June 2009
  #10
Gear Head
 
denismcd's Avatar
 

Tried and sold the DBX386...great for AD conversion. The tube gain was not to my taste. It sounded to me like I was listening through a wool sweater.
Old 9th June 2009
  #11
Gear Head
 

I had one once and the only mod I got around to was a tube swap. I can't remember what I used, but it made a big difference over stock. It's a good place to start.

BTW, I could have sworn there was a schematic in the manual
Old 9th June 2009
  #12
One of these had the HV taps on the power transformer go out. No replacements available. I bypassed the tube sections and it sounded pretty good.

Jim Williams
Audio Upgrades
Old 26th February 2016
  #13
surely someone out there has modded one of these? I hit up Black lion Audio to have a crack, money no option, and they said they are currently a bit busy. I think with the current 2nd hand price point of these units (and i personally love the sound, had neve,ua,aphex,meek,warm,lindell,gap, and i like this pre the best for mojo. The 386 sounds alot more open to me than the 376. I personally don't believe transformer balanced out would suit this pre as it is already like a tone from the tube section and seems already warm. I reckon transformer input would be awesome though. I reckon their could be heaps gained from op amp change, converter decoupling etc. I too can't find any info what so ever on toying with this great device. Help needed
Old 9th January 2017
  #14
Quote:
Originally Posted by Chris Parsons View Post
Hello,

What could I do to my DBX 386 to make it sound less "consumer"? I figure I can change the 12AU7 tubes to something better. What about opamps? Has anyone ever modded one of these and gotten good results?

Thanks,

-Chris Parsons
Did you have a go at mod? Wanting some info on these also. Great unit if you ask me. I have seen pics of transformer in/out when searching google, and heard of Burr Brown mods. But can't seem to find any info what so ever
Old 13th February 2017
  #15
I have requested schematic from Harman. Think burr brown, and output transformer mod on the horizon will post results hopefully in next month or two. I really believe these units getting bad wrap is purely people liking the sound of there own voices sometimes. Got amazing reviews worldwide. I dig the mojo of these units big time
Old 14th February 2017
  #16
Finally here you go
Attached Files
File Type: pdf 386 digital schematic.pdf (406.1 KB, 40 views) File Type: pdf 386 analog schematic.pdf (984.9 KB, 53 views) File Type: pdf 376 schematic digital.pdf (406.1 KB, 29 views) File Type: pdf 376 schematic analog.pdf (941.7 KB, 34 views)
Old 6 days ago
  #17
Here for the gear
Did you ever get around to modding your 386? Or did anyone else and have any tips?
Old 4 days ago
  #18
Gear Maniac
 

I mod the analogue section for $225 for the 386, $165 for the 376. I require a 50% down payment, after your mod is done, I will contact you to collect the remainder 50% plus return shipping. My estimated turn around time about 12 days from when you ship it to me. I guarantee my work and extend warranty of the analogue section to five years.
Old 3 days ago
  #19
Here for the gear
Thanks for the offer, but being based in Europe, shipping and customs would be way to expensive.
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