Aero71 Posted June 22, 2016 Share Posted June 22, 2016 Hi fellows, Recently bought myself a bass with a bypassed preamp. [url="http://s1016.photobucket.com/user/vitaminesap/media/PHOTO_20160617_104711.jpg.html"][/url] It works prefectly in passive mode (vol push/pull), but ofcourse I want the preamp to work again. Black and grey wires were disconnected. What I found out it is a Noll preamp with colour codes: black: input grey: output purple: ground white: +9V brown/red/orange: bass blue/green/yellow: treble So I have to resolder the black and grey wire. But where to? I know how to solder and a bit about electronics, but a little confused about this. Got a volume pot with push/pull function, blend and treble and bass. Someone who knows how to deal with this? Quote Link to comment Share on other sites More sharing options...
HowieBass Posted June 22, 2016 Share Posted June 22, 2016 There are schematics for current preamps on the Noll website but the colour coding looks to have changed from when your bass was constructed. Have you tried asking for help directly from Noll? http://noll-electronic.de/ Quote Link to comment Share on other sites More sharing options...
Aero71 Posted June 22, 2016 Author Share Posted June 22, 2016 Check! Did that. It's a 90's bass, so probably an older preamp which isn't made anymore. Ofcourse I could mail Noll, but thought BC is much quicker. Quote Link to comment Share on other sites More sharing options...
ikay Posted June 22, 2016 Share Posted June 22, 2016 The key to this lies in the wiring of the passive blend and vol. The two pickups are presumably wired to the blend pot. There should be a single (hot) wire from the blend pot to the volume pot and then another wire from the vol pot to the output jack. Unsolder this last wire from the output jack and connect it to the black wire (preamp in). Then solder the grey wire (preamp out) to the output jack. Assuming the other preamp wires are all properly connected to treble/bass pots, ground and battery this should work. If it doesn't I'll delete this post and deny any involvement 1 Quote Link to comment Share on other sites More sharing options...
Aero71 Posted June 22, 2016 Author Share Posted June 22, 2016 Woohoo, that worked! Thanks, Ian. Quote Link to comment Share on other sites More sharing options...
HowieBass Posted June 22, 2016 Share Posted June 22, 2016 Basschat scores again! http://youtu.be/K7gDP3vIKdU Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.