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Old 26th February 2013, 12:19 AM   #11
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Join Date: Aug 2009
Rechecked the legs of Q16 and no it was .922 volts dc. Ran out of time at the end of the day as far as reassembly and sound test. Will do it first thing in the morning and give you an update.

What does that low voltage on Q16 tell you? I also heated the solder around all the legs of Q15 & Q16again to ensure solid connection to the board.
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Old 26th February 2013, 12:22 AM   #12
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Location: Louisiana
Q16 appears to be defective.
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Old 26th February 2013, 01:15 AM   #13
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What are the chances these two are the only bad parts?

If they are where would i want to purchase replacements online from?

What part #s should i buy?

I'm also assuming i should replace both Q15 & Q16?
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Old 26th February 2013, 01:22 AM   #14
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Location: Louisiana
What are the part numbers on the original parts?
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Old 26th February 2013, 01:48 AM   #15
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I will post all the original part numbers in the morning. I am working on the amp during the day at the tire shop i work for. I have all the bench power and dmm stuff there not at home. Just wanted to thank you again for helping. You dont know how much i appreciate it. I wouldnt have known the first place to start without your assistance.
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Old 26th February 2013, 01:53 PM   #16
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I just tested for sound and got nothing.
I also tested +/-15 volt pins and got +15, -.919
part #s are as follows
Q15 UTCOLOB
2SD662
Q16 UTCOLOA
2SB649
Q212 DE048
TIP36C
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Old 26th February 2013, 05:29 PM   #17
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Join Date: Nov 2003
Location: Louisiana
I'd recommend that you use a 2N6488 and 2N6491 as replacements and install clip-on heatsinks as shown below.

I'd also suggest that you replace all 4 output transistors in the blown channel.

Digi-key
2N6491GOS-ND
2N6488GOS-ND
HS333-ND order 2
TIP35CGOS-ND order 2
TIP36CGOS-ND order 2

You'll also need heatsink compound.
345-1006-ND order 2
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Last edited by Perry Babin; 26th February 2013 at 05:44 PM.
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Old 26th February 2013, 06:56 PM   #18
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I found a website called digikey that had all of the above listed parts.
Would you recommend this vendor or is there another you prefer?
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Old 26th February 2013, 07:40 PM   #19
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Sorry Perry I didn't see that you recommended digikey. in your parts list. I will order the parts and let you know my results. Thanks again.
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Old 2nd March 2013, 06:15 PM   #20
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Parts just arrived. Where should I begin with removal and reinstall?

Also which part numbers go in which positions on the amp?
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