A Google search netted many images of Bugera 1990 amp wiring diagrams and schematics.. here is one source with a .pdf that has both wiring and schematic:
http://www.amprepairparts.com/schematics.htm
Hi, If you put " a schematic for the Bugera 1990 guitar amplifier?" in your search engine, you will get a selection of schematic web sites. Chose "frinthylcprobin.files.wordpress.com" There you will be able to download the schematic.
Kind regards
David
SOURCE: schematic for guitar amplifier
You didn't mention the make and model of the guitar amp, so I'll leave a link for several amps:
http://www.prowessamplifiers.com/schematics/
Enjoy!
SOURCE: Need Schematices
Try posting on some of the guitar forums. The schematics you are looking for are only available to licensed repair persons but you might get lucky and find someone who will send them to you. Be sure to state what model amplifier you want. If you are a tech try looking at some schematics for a similar amp and tracing the circuit.
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I have to assume you have looked at the web site below. Joining their community and asking a question from them might help find someone who would volunteer to provide you the schematic, rather than the company itself.
https://www.musictri.be/brand/bugera/sup...
http://forum.musictri.be forumdisplay.php?81-BUGERA
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