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I have a crate BX 160 that shuts down at the point where it starts limiting and then after a about 30 seconds. it starts back up. I would like to get a schematic on this particular piece of equipment however all the online order sites do not list the BX 160. Could you tell me where I might download a schematic for this Bass Amplifier

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I just saw your post. I happen to have a Crate BX-160 and was able to call Crate in St. Louis and talked with a tech there at the plant and he actually sent me full schematics for free.

Your problem, based on my electrical background and fixing audio equipment for 10 years, seems to be related to the built-in limiter in the power transformer. In other words, you might just need a new power transformer and it is a piece of cake to install (all push-on connections).

The schematic will show you the many test points for voltage checks, but unless you know what you are looking for, its just information overload. It is a rather simple amplifier and built resonably well. I have been using mine since 2003 and have fixed it a few times (age related problems like loose connections). There just is not much to go wrong on them except for the fact the amp is subjected to extream vibration. THis causes physical connections to fail resulting in vexing issues that are hard to solve. This is not unique to this amp (all bass amps).

I would bet anything your problem is the power supply shut-down circuitry is malfunctioning. In my expereience with amps, unless the amp is drawing current (failing power circuitry) and making strange sounds, the failure is usually not related to the power section failing (like power transformers going out). Likely, the built in limiter is the problem.

I hope this helps!

-mike
(development engineer)

Posted on Mar 30, 2009

  • Art the Man Feb 15, 2013

    Hey Mike. can you help on push -on connectors? i was reasembling my amp and cant figure out where 2 red wires go..? they same colour and i not wont to connect them wrong...can you advise?

  • Art the Man Feb 15, 2013

    hey Mike. can you advise on push-on connectors schematic? i disconected 2 red wires from main bord..and cant figure out how to connect them properly. couse they are both red. any ideas?thanks .

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