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9 times outa 10 its the power supply not the amp. I would check the mosfets one or both are either bad ro shorted. Also check for burnt resistors. On my RW-10 Q402 went bad and shorted blowing fuses instantly.

Replace TL082CN in the preamp (CP-1)

Replace TL082CN in the preamp

Replace the TL082CN chip in the preamp. Should be less than 5$ + shipping. DigiKey has them. Then if the loudness problem between the speakers still exists replace the other 2 preamp chips. Luckily mine worked fine with the TL082CN replaced. That goo inside is normal.

I was having problems with static and pops. The speakers would make the noises even when nothing was plugged in. SOLUTION I took apart the CP-1 and replaced the TL082CN J-fet dual op chip. This little 8 pin chip cost me under $5 and the system once again works flawless. I removed the line input jack to reduce some humming. If you turn the volume up and touch the metal ring on the CP-1 you will notice the humming will stop. This is some kind of ground issue for that jack. Finaly I replaced the 2 main resistors with 3watt versions of 47k and 680 ohm. I checked all the voltages and they were right on after those changes. I left the leads as long as possible and bent them away from the capacitors. This should keep some heat off the board and surrounding components. Origional Resistor measurements 48.1k ohms 647 ohms Replacement Measurements 45.6k ohms 673 ohms *Both are within about 5% Here are my voltage measurements 120v - in 164v - board 1 54v - board 2 7.5v - to the amp boards +15v -15v - to CP1

Well the parts are installed and the unit is alive again. I'm pretty happy. Im alittle concerned about proper voltages going through the power supply the measured values of my resistors are 46.5k and 671 ohms the measurements of the ones in my good systerm were 48k and 651 ohms.....Should I be worried about this?

Just to confirm that these parts are correct and will work.......R26 47k R12 680 I measured my working unit and R26 was 48k and R12 was 658 both of which are 5% from 47k and 680 This is my order from digikey. I sure hope these will work. I know 3 watt is large but hey atleast it wont burn out as fast. Index Quantity Part Number Description Unit Price USD Extended Price USD 1 2 IRF740IR-ND MOSFET N-CH 400V 10A TO-220AB 3.37000 $6.74 2 5 BC47KW-3JCT-ND RES 47K OHM METAL FILM 3W 5% 0.54200 $2.71 3 5 PPC680W-3JCT-ND RES 680 OHM METAL FILM 3W 5% 0.41800 $2.09 Subtotal $11.54

I recently discovered my 4.1's dead. I loved this system so I decided I needed to fix it. I have 2 of the systems. I compared the power lines running through. On the dead system I have 180vDC comming into the 640014 power supply but nothing coming out. The fuse was blown and also one of the IRF740 fets. I ordered 2 new fets and for the hell of it I checked my 47k r26 resistor. That also had a nice crack hiding on the bottom. I am going to replace these parts and report back......any tips from the veterans? On the other power supply board the large resistor shows signs of getting very hot. Any way to keep these cooler? ~Wayne