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Rockford fosgate punch 75 TO-237-3 Transistors
Rockford fosgate punch 75 TO-237-3 Transistors
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Old 13th February 2018, 04:41 AM   #1
Life is an Enigma is offline Life is an Enigma  United States
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Default Rockford fosgate punch 75 TO-237-3 Transistors

Ok I am working on a 1th gen Fosgate Punch 75 I am replacing the output transistors 2N6487 & 2N6490 Mouser has them in stock with a G on the end of the number but I can not find the drivers 2N6728 & 2N5716 in TO-237-3 package. Is there a substitute I can use in their place?

Last edited by Life is an Enigma; 13th February 2018 at 05:07 AM.
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Old 13th February 2018, 09:52 AM   #2
MarioRestucci is offline MarioRestucci  Italy
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TO-237 is an old package.
You can replace with other package type with same key parameters and pinout.
if you are willing to reverse pins 2 and 3, you can easily use a pair of bd139 and bd140 (which have a slightly different pinout)
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Old 14th February 2018, 01:37 AM   #3
seankane is offline seankane  United States
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Use IRF540 and IRF9540. Do not use the "N" version.


I have used these in many of these amps as a sub with high success.
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Old 14th February 2018, 01:54 AM   #4
ppia600 is offline ppia600  United States
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Quote:
Originally Posted by seankane View Post
Use IRF540 and IRF9540. Do not use the "N" version.


I have used these in many of these amps as a sub with high success.
He mentioned non-mosfet 2n6487 and 2n6490 as outputs. I thought the first gen 75 had non mosfet outputs? What would the 540 and 9540 be for?
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Old 14th February 2018, 02:08 AM   #5
seankane is offline seankane  United States
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I did read his post, but thanks for looking out.


I have used IRF540 and IRF9540 in these amps many times with no problems. The IRF540 is "N" channel used in the "NPN" location and IRF9540 are "P" channel used in the "PNP" location.


Example: IRF540 "N" channel will be used for 2N6487 "NPN"
Example: IRF9540 "P" channel will be used for 2N6490 "PNP"
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Old 14th February 2018, 02:17 AM   #6
ppia600 is offline ppia600  United States
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That's pretty badass, didn't realize they would interchange. Does that help the amp run cooler and/or improve sq?

How would an amp like a ppi with the same outputs react with 540 and 9540 in their places react?
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Last edited by ppia600; 14th February 2018 at 02:21 AM.
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Old 14th February 2018, 02:17 AM   #7
seankane is offline seankane  United States
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Quote:
Originally Posted by ppia600 View Post
He mentioned non-mosfet 2n6487 and 2n6490 as outputs. I thought the first gen 75 had non mosfet outputs? What would the 540 and 9540 be for?


I must add the ones I subbed were for MTP3055A and MTP12P05. You may be right on this one PPIA600.
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Old 14th February 2018, 02:19 AM   #8
seankane is offline seankane  United States
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Quote:
Originally Posted by ppia600 View Post
That's pretty badass, didn't realize they would interchange. Does that help the amp run cooler and/or improve sq?


I'm almost positive I have done it with the other ones as well. I have did it on many power 650 and power 300 amps too. Let me check my notes.
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Old 14th February 2018, 02:32 AM   #9
seankane is offline seankane  United States
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I think as long as they are this configuration it will work.
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Old 14th February 2018, 07:50 AM   #10
MarioRestucci is offline MarioRestucci  Italy
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Originally Posted by seankane View Post
I think as long as they are this configuration it will work.
I did not know that a mosfet could be installed in place of a bjt without problems.
Are 2 types of different devices, will it work normally?
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