Biasing Hartke HA 7000 - diyAudio
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Old 5th June 2012, 07:42 PM   #1
diyAudio Member
Join Date: Jun 2008
Default Biasing Hartke HA 7000

Hey gang,

Got a Hartke HA7000. One power module is cold at startup, but the other gets SUPER hot SUPER fast.

I'm going to check voltages, but I don't want to blow that power module.

I had replaces a set of 2SC5200 / 2Sa1943's on both boards.

What's the voltage I should see Going to the modules? For either a 5000 or a 7000 unit?

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Old 5th June 2012, 07:57 PM   #2
diyAudio Member
Join Date: Jun 2008
Both modules are getting:

51 VAC
+66 volts DC
-66 volts DC

One module is getting an inverted signal....thats on purpose.
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