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Dbx 128 Mods
Old 18th March 2013
  #1
Lives for gear
 

Dbx 128 Mods

just a few pics of a dbx128 I recapped & modded





Im running LME49710NA opamps on the singles and ne5532s on the duals pretty clean beefed up the psu caps from 470uf to 1000uf as well.
Old 25th March 2013
  #2
Lives for gear
 

I noticed a low level hum in the unit and decided to keep modding it




pulled the transformer out and made my own diy wall wart supply now its very quiet with a self noise of -108db at -6db on the meters
Old 10th June 2013
  #3
Lives for gear
 

Where did you used the LME Opamps? Did you bypassed them?

How and which Powersupply did you used?

I have a Problem with my DBX, one of these boards is defective. One of the boards with the red caps next to the transformer. I cross changed them and so i know that one of them is defective. But i dont know what is defective. There is no Signal coming from board. Any Ideas? I thought that one of the transistors or maybe the tba331 could be defective. Any tip how i could find it out?
Old 14th June 2013
  #4
Lives for gear
 

id check the tantalum caps first. I had to change every one in mine. The opamp I picked is pretty mild and unity stable so it didn't need bypassing. I also pulled the noise reduction cards from mine which made it a dbx 118 in all reality.
Old 14th June 2013
  #5
Lives for gear
 

mine had some issues. the tantalumns were fu**ed up. changed them with panasonic fc series. Recapped the PSU. Then there was an defective Transistor Array on one of the cards. Now it works. Only problem is when i switch between linear and above threshold... the linear sounds **** on the first hit of the basedrum... dont know if this is normal or if there is something ****ed up. I changed 2 of the opamps for ne5532. I was thinking for swapping them with opa2134 which i like soundwise. LME49710NA they sound very clean and accurate, i like them but maybe not the right choice for a coloring box...

From what i can say after a few tries, this box makes a fatter sound. Nice for Drums and also for Bass and Musical Material. The good thing is i can switch to -10dbv on my interface so i can sent the right signal to it....

How do you use it?

Thanks for your help.
Old 15th June 2013
  #6
Lives for gear
 

parallel processing on the drum bus and on the bass, but most of the time I'm using the dbx 163x for the bass.
Old 7th January 2019
  #7
Here for the gear
 

This is my modded DBX 128 project. It has true bypass, 1/4 jacks, input and output gain control, attack and release control, an upgraded power supply, and a side chain input.

This is my modded DBX 128 project. It has true bypass, 1/4 jacks, input and output gain control, attack and release control, an upgraded power supply, and a side chain input.
Attached Thumbnails
Dbx 128 Mods-20190106_161732.jpg   Dbx 128 Mods-20190106_161759.jpg   Dbx 128 Mods-20190106_161717.jpg   Dbx 128 Mods-20190106_161759.jpg   Dbx 128 Mods-20190106_161717.jpg  

Dbx 128 Mods-20190106_161732.jpg  

Last edited by Synth Guru; 13th January 2019 at 09:06 PM.. Reason: Same thread
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