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Old 6th February 2013, 03:34 AM   #1
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Default Rockford Punch 45

Hello have an older Punch 45 before they had fuses.

It had a shorted output. I removed the shorted output and the amp powers up and produces audio on the remaining good channel.

Dont have a schematic need to know what the burned resistor is next to the white power wire. I assume it burned while the amp was drawing current from being powered with a shorted output.

Can I replace MTP12P05 with IRF9540?
Can I replace MTP3055A with IRF540?

I have 200 MTP3055E in stock not sure if they are the same as the "a" version?

I can still order the MTP12P05 but I think I would rather use the 540/9540 if they will work in this amp??
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Old 6th February 2013, 03:42 AM   #2
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The resistor is likely OK. It's a 120 ohm.

The 540/9540 would be my choice.
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Old 6th February 2013, 04:21 AM   #3
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Thanks.
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Old 11th February 2013, 06:53 AM   #4
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Replaced the outputs, amp works great.

Can you tell me what year this model is?
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Old 11th February 2013, 07:39 AM   #5
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I don't know the exact year but if that's the date code on the op-amp, the op-amp was manufactured in the 12th week of 1987.
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