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Old 22nd March 2011, 03:19 PM   #11
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There is no version of the 064 with the specs they have on the site. They were entered into the system incorrectly. Those appear to be out of stock also. I'd suggest telling the owner to wait until you can get the parts at a reasonable price. For what you'd have to charge, he could almost buy another amp.

The orientation of the driver board isn't significant when they're laying out the amp.
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Old 22nd March 2011, 06:14 PM   #12
Dr Zeus is offline Dr Zeus  United States
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IC that now. This seems to be a better deal. I dont like purchasing components like this off fleabay (EEK!!) but have you any experience buying from ActiveParts seller?

IRFP064N lot of 25 units costs ~$37.

IRFP064N MOSFET 55V, 110A, 200W BY IR LOT OF 25 - eBay (item 390018359734 end time Apr-07-11 22:23:41 PDT)
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Old 22nd March 2011, 07:09 PM   #13
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I've never purchased anything from them.
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Old 23rd March 2011, 12:16 AM   #14
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Quote:
Originally Posted by Dr Zeus View Post
IC that now. This seems to be a better deal. I dont like purchasing components like this off fleabay (EEK!!) but have you any experience buying from ActiveParts seller?

IRFP064N lot of 25 units costs ~$37.

IRFP064N MOSFET 55V, 110A, 200W BY IR LOT OF 25 - eBay (item 390018359734 end time Apr-07-11 22:23:41 PDT)
I have bought tons of parts from Activeparts on ebay and always recieved quality parts and fast shipping without ever having any issues. I would not hesitate at all.
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Old 23rd March 2011, 03:13 PM   #15
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ive bought from activeparts on ebay as well.. fast shipping and good cust service..
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Old 23rd March 2011, 03:33 PM   #16
Dr Zeus is offline Dr Zeus  United States
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Thanks guys I'll just give ActiveParts a shot. Hopefully the cost/benefit works out because otherwise it would cost over $100 for the same quantity of parts from any other place.

This amp still has issues, likely from bad drivers in the audio section. I've split up the surviving PS fets so that the amp produces correct positive and negative voltage throughout including proper rail and regulated voltages. Within about 5-10 seconds, the remaining IRF9640 outputs get very hot to the touch which the IRF640s remain relativly cool. The outputs are not measuring shorted so it leads me to think something is bad in the driver circuit.

Before I pull the remaining outputs, is anyone familiar with the driver board in these style amplifiers?
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Old 23rd March 2011, 09:58 PM   #17
Dr Zeus is offline Dr Zeus  United States
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I found something I did which wasnt right. I had replaced the the KA7912 with a +12 regulator instead of a -12v regulator. I've since fixed that issue. Now when I power the amp, the IRF9640N outputs no longer get hot, but the other outputs IRF640N at Q220 thru Q224 get hot after just a few seconds.
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Old 23rd March 2011, 10:09 PM   #18
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In the middle picture of the driver board .
R31 looks damaged
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Old 23rd March 2011, 11:15 PM   #19
Dr Zeus is offline Dr Zeus  United States
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The images above are actually off of Perry's DVD. The board Im looking at looks to be alright in terms of everything checking out. I've tested most of the transistors off of the board, and of the half that services the affected side of the amp I've only got Q8 and Q10 left to test. All other small and medium sized transistors seem to be alright.

One thing I notice, is with the outputs removed and the scope set to AC coupling; theres a fairly fine looking square wave on the gates. When I put one output fet in place, the gate waveform is jagged on the negative/lower half.
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Old 23rd March 2011, 11:38 PM   #20
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When you checked the transistors, did you confirm that every one had two good junctions?
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