DBX 900 Mods

Link555

Well-Known Member
Joined
Mar 31, 2007
Location
North Vancouver
This 900a Series is in to get TRS jacks in to replace the terminal connectors. I made a Custom PCB to replace the board mount terminal connector and reuse the original metal work with a 3D printed mounting plate.
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Boswell

Moderator
Joined
Apr 19, 2006
Location
UK
Ah-ha, the old TO-127 package! It looks like the middle 4 Darlington transistors are in this package mating with the 0.156" connectors. The outer two regulators are conventional TO-220, going directly into 0.1" sockets.

Easy to take apart, but it's a very unreliable way of connecting to power device leads. Any increase in contact resistance through ageing can quickly build into a run-away failure.
 

Boswell

Moderator
Joined
Apr 19, 2006
Location
UK
Pretty impressive! Is the rear panel in the same position as it was originally, or did you have to move it back a bit to cater for the length of the TRS sockets?
 

Link555

Well-Known Member
Joined
Mar 31, 2007
Location
North Vancouver
And now repairing 8 dbx 900 series cards... 6 904 noise gates and 2 903 compressors.
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One compressor was the worst off three funky opamps and one internally disconnected 20k threshold pot.
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