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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 14th February 2018, 07:31 PM   #11
wg_ski is offline wg_ski  United States
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There are one or two amp topologies where swapping out bipolar outputs for mosfets without circuit adjustment is possible. Amp in question is probably using CFP 's - for low voltage drop when the outputs clip. It will run the driver transistors at a higher quiescent current compared to BJT outputs, but require less of them at full drive. This trick only really works for modest size amps - if you try to scale it up to something big it will have problems. Those old RF amps aren't that big by today's standards.
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Old 15th February 2018, 01:35 AM   #12
Life is an Enigma is offline Life is an Enigma  United States
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Originally Posted by seankane View Post
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"
Thats good to know but what I need is a sub for the 2N6728 & 2N5716 they are no longer available / obsolete. I think I found a sub for the 2N6728 that is a MPS751 in TO-92 package but I stiil need a sub for 2N5716.

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Last edited by Life is an Enigma; 15th February 2018 at 01:40 AM.
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Old 15th February 2018, 05:07 AM   #13
seankane is offline seankane  United States
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I misread your first post. I thought you were looking for outputs not drivers, my apologies.


The later models used D41D8 and D40D8. I stock those. If the pin out is right maybe they will work.
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Old 16th February 2018, 03:33 AM   #14
wg_ski is offline wg_ski  United States
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I thought D40D series TO-202's were just as much unobtainum as those funny looking TO 92-ish things. Even the tall 1 watt To92 is pretty well gone. Could use KSA1120/KSC2690.... while you can still get 'em.
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Old 16th February 2018, 05:16 PM   #15
Perry Babin is offline Perry Babin  United States
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It's odd that all of the drivers would fail. Are you sure that you need to replace them? Sometimes subs can cause problems.
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Old 16th February 2018, 11:04 PM   #16
Life is an Enigma is offline Life is an Enigma  United States
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Originally Posted by Perry Babin View Post
It's odd that all of the drivers would fail. Are you sure that you need to replace them? Sometimes subs can cause problems.
I just pick up the Punch 75 tested it distorted outputs opened it up and found the fuses wrapped in tinfoil I guess they thought it would work better that way
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Old 17th February 2018, 01:37 AM   #17
Perry Babin is offline Perry Babin  United States
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Before replacing the fuses, squeeze the fuse holders together to ensure that they're tight.
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Old 18th February 2018, 07:10 PM   #18
seankane is offline seankane  United States
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Quote:
Originally Posted by wg_ski View Post
I thought D40D series TO-202's were just as much unobtainum as those funny looking TO 92-ish things. Even the tall 1 watt To92 is pretty well gone. Could use KSA1120/KSC2690.... while you can still get 'em.

You can still find them, their just expensive. I stock many of each.
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Old 22nd February 2018, 08:53 PM   #19
motronix is offline motronix  Israel
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2N6491+6488 Genuine ON Semi PNP+NPN 80V 15A Transistors

5 Pair 2N6491+6488 Genuine ON Semi PNP+NPN 80V 15A Transistors | eBay
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