make a kac-9102d 1 ohm stable

91h22a · 02:22 PM

Hello everyone I recently purchased what I thought would be a non functioning kac-9152d off of ebay but instead I received a kac-9102d. I tried to contact seller but no response... so after reviewing the schematic and a small amount of troubleshooting I got the amp functional again(open R58 in -15avr circuit). I did notice that it seems there are only minor differences with the 9152d and the 9102d. The main difference I see to make the 9152d 1 ohm stable is the slightly more beefy power supply section...namely the addition of two 2sk3662's in positions q15 and q17 i believe this could possibly what I need to make the amp more desirable. If anyone has a moment I would truly appreciate your input. I am not concerned about the remote bass control as I feel it is unnecessary for my needs.

If this is a feasible endeavor what should I use in place of the 2sk3662's as I cannot find any supplier with a reasonable price..i.e. $10 ea. from parts store.

Here is a link to schematic for any interested.

http://www.eserviceinfo.com/download...02D,9152D.html

Thanks to all who reply and I appreciate your time and consideration.

-David-

Perry Babin · 1st February 2011, 02:31 PM

If the board has the open locations for the gate resistors and FETs, the following FET should work. Replace all of the power supply FETs so that they'll match.

844-IRFIZ48GPBF (mouser)

91h22a · 1st February 2011, 05:37 PM

Thanks Mr. Babin! I appreciate the fast response! I will order those as soon as I can.

harvie256 · 2nd February 2011, 06:08 AM

Certainly from the parts cross ref chart it would appear that those extra mosfets are the only change between the two amps. While part numbers are the same, I would keep an eye on the temp of the transformer in case the winding thickness was any different. Shouldn't be, but worth a look.

If fact the whole thing would be worth testing at 1ohm on the bench before any install that consumed considerable time. Just be aware that if testing with a continuous sinewave that it is a very hard thermal test on an amp/power supply. Often it doesn't take too long for overheat protection to cut in. A good lazer temp instrument can be great here.

1st February 2011, 02:18 PM	#1
91h22a diyAudio Member Join Date: Sep 2007	make a kac-9102d 1 ohm stable Hello everyone I recently purchased what I thought would be a non functioning kac-9152d off of ebay but instead I received a kac-9102d. I tried to contact seller but no response... so after reviewing the schematic and a small amount of troubleshooting I got the amp functional again(open R58 in -15avr circuit). I did notice that it seems there are only minor differences with the 9152d and the 9102d. The main difference I see to make the 9152d 1 ohm stable is the slightly more beefy power supply section...namely the addition of two 2sk3662's in positions q15 and q17 i believe this could possibly what I need to make the amp more desirable. If anyone has a moment I would truly appreciate your input. I am not concerned about the remote bass control as I feel it is unnecessary for my needs. If this is a feasible endeavor what should I use in place of the 2sk3662's as I cannot find any supplier with a reasonable price..i.e. $10 ea. from parts store. Here is a link to schematic for any interested. http://www.eserviceinfo.com/download...02D,9152D.html Thanks to all who reply and I appreciate your time and consideration. -David- Last edited by 91h22a; 1st February 2011 at 02:22 PM.

1st February 2011, 02:31 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If the board has the open locations for the gate resistors and FETs, the following FET should work. Replace all of the power supply FETs so that they'll match. 844-IRFIZ48GPBF (mouser) __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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1st February 2011, 05:37 PM	#3
91h22a diyAudio Member Join Date: Sep 2007	Thanks Mr. Babin! I appreciate the fast response! I will order those as soon as I can.

2nd February 2011, 06:08 AM	#4
harvie256 diyAudio Member Join Date: Oct 2009	Certainly from the parts cross ref chart it would appear that those extra mosfets are the only change between the two amps. While part numbers are the same, I would keep an eye on the temp of the transformer in case the winding thickness was any different. Shouldn't be, but worth a look. If fact the whole thing would be worth testing at 1ohm on the bench before any install that consumed considerable time. Just be aware that if testing with a continuous sinewave that it is a very hard thermal test on an amp/power supply. Often it doesn't take too long for overheat protection to cut in. A good lazer temp instrument can be great here.

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