ROCKFORD PRO 301 SP a bad right channel (burns TC11) - Page 3 - diyAudio
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Old 4th August 2011, 05:43 AM   #21
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50mv is quite high and will likely make the amp run hot. Where did you get that value from?

If the value is the voltage across the source resistors, you would connect one meter probe to each end of the source resistor.

I'd suggest setting it as shown in the following demo.
http://www.bcae1.com/temp/ausettingbias.swf

No matter the method you use, you must have all transistors clamped to the heatsink when setting the bias.
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Old 4th August 2011, 08:34 AM   #22
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The 50mV are in the library test procedures rockford corporation technique 2002 (300S amplifier) So, this value (50mV) is not applicable at this stage?
Okay, I'll do what you say.
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Old 4th August 2011, 09:34 AM   #23
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The test procedure says 50ma (milliamps, not millivolts) per FET. That's 0.005v across a 0.1 ohm resistor. In my opinion that is still a bit high but may not be high enough to make the amp run hot. If you set it to 0.005v, drive the amp until it's near thermal and make sure that the bias doesn't increase when it's hot.
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Old 4th August 2011, 12:18 PM   #24
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If .... is true, I have it wrong again (I'm much mistaken, sorry, I thought I had seen mv.)
I'll do what you say.
I'll tell you ....
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Old 4th August 2011, 10:28 PM   #25
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What reason were you, Perry! with IRF540 in place, and bias in the halfway, the stage works perfectly! even at high input levels, the warming is normal, everything perfect, another problem solved, thank you very much for the help, you're a genius.
Well, do not bother more.
(maybe within 15 days, you have to help me with 1501bd)
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Old 5th August 2011, 07:26 AM   #26
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Start a new thread for any new repairs.
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