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Old 6th September 2012, 10:11 PM   #11
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I've marked x's on the packages that get hot.
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Old 6th September 2012, 11:16 PM   #12
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There are 3 outputs grouped together but only one has an x on it. Remove it and clean the pads to ensure that there are no solder bridges. Does that change anything?
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Old 10th September 2012, 10:31 PM   #13
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I don't understand what you mean with the 3 outputs. It seems like the output(yellow wire) is connected to a group of 6 TO-220 packages(top left of picture). Can you further describe which package you are talking abot?
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Old 11th September 2012, 10:51 AM   #14
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There is a group of 6 outputs for one channel. There are two groups of 3 for that channel. One group of 3 had 3 Xs. The other group of 3 has 1 X. Remove the transistor with the X in that group of 3.
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Old 12th September 2012, 01:56 PM   #15
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That does seem to be the issue. Before removing the component I measured resistance to be ~200 ohms between pins 2 and 3. After removing it went up to Mohms.

I'm looking to find out what the part number is. The numbers are not legible, but it looks like 2N6438. I can only find that part as a TO-3, so it doesn't look like I'm able to read the part number well enough. How can I go about finding the part number, or selecting an appropriate alternate?
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Old 13th September 2012, 05:44 AM   #16
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2N6488. They have to be replaced in groups.
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Old 13th September 2012, 01:20 PM   #17
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Thank you Perry. By the way I did go ahead an turn on the amp(no load) to ensure the short was fixed and both channels now draw standby current of ~.8A.
I'll go ahead and replace all 6. Should I also be replacing the complementary 2N6490s or is it only important to change the ones in parallel with each other?
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Old 13th September 2012, 01:47 PM   #18
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If you want the amp to be as reliable as possible, replace the 2N6491s also.
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Old 13th September 2012, 07:09 PM   #19
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Great. Thank you again Perry, you've been a huge help.
I'll confirm all is well once I get these components in and test the amp.
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Old 10th October 2012, 10:51 PM   #20
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I tested the amp and after about 15 seconds on I heard a noise and smelled some smoke. I turned it off quickly, but now when I turn it on it draws ~15A (current limited on my power supply).

I am trying to trace the problem and I've found that there is no voltage on one of the inputs to the transformer, so I suppose it's the drive circuitry, but I am unsure how this amp is laid out. What components should I be look at or what tests should I perform?
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