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BX-40 bass amp works great for about 10 minutes then starts to cut in and out?..I let it cool down for a while then the same issue every time? any ideas? Thanks , Craig

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It is having a thermal runaway as the output transitors are heating up to cut off . so first of all release the loaded speakers to test if the fault changes. If so you r speakers must be checked for mismatch of impedance.
Otherwise the power amp circuit must be checked for excessive biasing check stage by stage, check for leaks in preamp stage that makes the output run wild.

Posted on Sep 14, 2010

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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...


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)

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