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Old 4th December 2008, 09:11 PM   #1
Solosound is offline Solosound  Mexico
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Exclamation New sick amplifier

Again arrive to me this broken amplifier.

This is one 4040DSM by the punch.

The power source is blown.
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I find two different mosfets; are two IRFZ44 and two IRFZ46.
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¿What are the right part number?

¿Some one remember the right part for the drivers? I view two resoldered marked like “2A”
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The rectifiers diodes, one is resoldered (maybe changed) marked LM7915CT and the original is 7815CT.

The amplifier section, apear be fine.

I will buy some parts today from Newark. ¿should I buy any more to prevent time delay?
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Old 4th December 2008, 10:44 PM   #2
Eva is offline Eva  Spain
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7815 and 7915 are +15V and -15V regulator ICs respectively.

The mix of IRFZ44 and IRFZ46 in the power supply is probably due to a bad repair job and it's enough by itself to cause trouble.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 4th December 2008, 10:49 PM   #3
Perry Babin is offline Perry Babin  United States
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The 2A parts are MMBT3906s.

The original FETs were probably BUZ11s but either the Z44 or the Z46 would be a good sub.
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Old 5th December 2008, 02:29 AM   #4
ppia600 is offline ppia600  United States
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Yeah, replace all four power supply fets with the same part number. Irfz44 seems to be a good all around replacement these days.
Don't worry... you can always turn the gain down!
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