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make a kac-9102d 1 ohm stable
make a kac-9102d 1 ohm stable
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Old 1st February 2011, 02:18 PM   #1
91h22a is offline 91h22a  United States
diyAudio Member
Join Date: Sep 2007
Default 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.


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


Last edited by 91h22a; 1st February 2011 at 02:22 PM.
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Old 1st February 2011, 02:31 PM   #2
Perry Babin is offline Perry Babin  United States
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)
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Old 1st February 2011, 05:37 PM   #3
91h22a is offline 91h22a  United States
diyAudio Member
Join Date: Sep 2007
Thanks Mr. Babin! I appreciate the fast response! I will order those as soon as I can.
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Old 2nd February 2011, 06:08 AM   #4
harvie256 is offline harvie256  Australia
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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