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Old 12th January 2011, 10:44 PM   #21
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Yes but you need to remove all defective outputs (check gate to drain).

Check the gate resistors after removing the FETs to confirm that they're within tolerance.

Install them and measure the gate voltage. Make sure that both sides have ~5v DC on the gates. If the voltage is not the same from one side to the other, there may be a problem with the drive circuit.

When measuring the voltage on the gates, do so with ONLY remote and ground connected. Do NOT connect the B+.

I got it to turn on and played music through the good channel i only did this for a few seconds! It turns on, i stuck 3 buz10s inside for testing and it turns on!! Does this mean it's going to survive?? All i got to do is get the 3205s and gate resistors, right? And of course new output transistors. Btw can you please direct me to the correct gate resistors? Thanks, thanks!
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Old 12th January 2011, 10:57 PM   #22
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The gate resistors are nothing special. 0805 size, 47 ohms.

I can't answer the question about the outputs without knowing 'precisely' which transistors failed.
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Old 12th January 2011, 11:07 PM   #23
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Quote:
Originally Posted by Perry Babin View Post
The gate resistors are nothing special. 0805 size, 47 ohms.

I can't answer the question about the outputs without knowing 'precisely' which transistors failed.
Left channel failed I measured continuity on the driver transistors and I get 647 ohms from base, collector, emitter. And that's for both transistors but a couple gate resistors are reading 0.8 ohm.
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Old 13th January 2011, 06:01 AM   #24
chipper is offline chipper  United States
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Just wondering what is better? IRF3205 or STP80NF55-06? And if i went with the ST mosfet will i still need to change the gate resistor value?
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Old 13th January 2011, 11:19 AM   #25
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How do you define 'better'?
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Old 13th January 2011, 01:33 PM   #26
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
How do you define 'better'?
I mean when I said 'which is better' which fet will be able to handle alot of stress in a switch mode power supply? Not that I'm going abuse the amplifier & run it below it's recommended load. I'm going to use it for daily driving (bridged to a single 4 ohm woofer) and I want make sure it will last along time. Also I ordered new outputs and gate resistors haven't got anything for the power supply because I'm still deciding on a "good" fet to use. Thanks
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Old 13th January 2011, 01:43 PM   #27
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I don't know if the other FET will be more reliable but I've installed the 3205s in hundreds (literally) of Rockford amps and they have proven to be reliable.
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Old 13th January 2011, 02:14 PM   #28
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
I don't know if the other FET will be more reliable but I've installed the 3205s in hundreds (literally) of Rockford amps and they have proven to be reliable.
Okay I'm going to get IRF3205s, what if I left the original gate resistors in place? Since they read 69 to 70 ohms a piece. Would those cause problem?
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Old 13th January 2011, 02:25 PM   #29
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The 68 ohm resistors are borderline OK. I'd suggest using the 47 ohm.
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Old 13th January 2011, 09:22 PM   #30
chipper is offline chipper  United States
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Is a Futurlec.com a good online shop to buy from?
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