Bias adjustment for Punch150 transistor outputs - diyAudio
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Old 7th July 2010, 09:58 PM   #1
diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
Default Bias adjustment for Punch150 transistor outputs

Is the adjustment the same as the fet based outputs? Normally I monitor the voltage across my current sense resistor in series with incoming power and watch for it to take off. I then back it off a touch. I don't notice the "take off" point on this amp.

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Old 7th July 2010, 11:20 PM   #2
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Join Date: Nov 2003
Location: Louisiana
I think all Rockford amps tend to increase significantly at some point. Which components did you replace in the audio section of the amp?
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Old 8th July 2010, 12:39 AM   #3
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Join Date: Sep 2009
Location: Wisconsin
I didn't adjust far enough, about 3/4 turn of the pot it finally increased like I expect. Most of the newer amps don't get much past half turn before they increase. That is why I ask the question.

This amp had blown Buz11's in the power supply and one channel had a shorted 2n6487 and 2N6490. This amp was untouched when I got it, all components were originals, no signs of rework. The bias pots seem to be in the same position as when I recieved it.
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