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Old 28th February 2012, 09:52 PM   #1
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Default punch 500x bias voltage

what voltage should the bias be in this amp?

i also have a small punch with no info on it.It is a two channel using 1 irf540 and 1 irf9540 per ch.Two PS FETs.I set this one at 0.1mv and it seems to be playing good.Any idea where it should be?
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Old 29th February 2012, 12:41 AM   #2
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This is how I generally set them for Rockford amps.
http://www.bcae1.com/temp/ausettingbias.swf
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Old 29th February 2012, 01:31 AM   #3
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The amp has 4 ports .If i set one at the right gage how would i no when the oder 3 is at the right gage?
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Old 29th February 2012, 11:28 AM   #4
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Each channel would show the same tiny increase in current draw.
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Old 29th February 2012, 02:26 PM   #5
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One of the channels is giving me a hard time to set.I set the other 3 ch @0.2mv but the next ch bias starts at 4.3mv and up.I change the port but no change.

Also the 2/4 ch input switch in making the amp draw more current when it is in the 2 ch position.where does this switch have to be when setting the bias?

I have a 50w light bulb for limmiter
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Old 1st March 2012, 02:53 AM   #6
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The switch shouldn't make a difference in the idle current. Don't have speakers or RCAS connected when setting the bias.

Did you replace the outputs in the channel with higher bias?
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Old 1st March 2012, 12:17 PM   #7
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I only replace 4 PS FETs
I think the owener of the amp turn up the bias trying to get more power from it.

The input switch is making the amp draw a little more amps when it is set to 2ch
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Old 1st March 2012, 01:08 PM   #8
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I found a leak on one of the FET in the same ch.I will change it and see what happen
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Old 1st March 2012, 01:29 PM   #9
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I used a next meter and FET is good
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Old 1st March 2012, 09:26 PM   #10
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Short the collector and emitter of the bias channel for the defective channel. Does that cause the bias voltage across the source resistors to go to 0.000v DC?
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