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Old 1st February 2011, 02:18 PM   #1
91h22a is offline 91h22a  United States
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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.

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.
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Old 1st February 2011, 02:31 PM   #2
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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
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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
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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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