Need help with xr600c with 400BH amp

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JUSTMIKE
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Joined: Wed Aug 07, 2013 10:02 pm

Need help with xr600c with 400BH amp

Post by JUSTMIKE » Fri Jan 29, 2021 10:47 pm

My amp died after using it every week for years. Just went dead. I tested the voltages and all seems good so I hooked up a speaker and slowly brought it up with a 200hz 1.5 mv signal on the input pin of the amp board. I got to about 60V in drawing ~.25A and started hearing the 200hz. As I increased the line voltage the speaker pulled down hard so I shut it down. When I give it full line voltage with no load I see no DC on the speaker jack. Does anyone know what this could mean?

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Enzo
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Joined: Fri Sep 12, 2008 10:24 pm
Location: Lansing, Michigan

Re: Need help with xr600c with 400BH amp

Post by Enzo » Sat Jan 30, 2021 1:50 am

Amps are not stable at low voltages.

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