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Old 10th March 2013, 04:13 AM   #61
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If you used the same signal source material (mp3 file), maybe the MP3 file is distorted. For testing, you need to leave the files in wav or another lossless format.
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Old 10th March 2013, 04:30 AM   #62
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Quote:
Originally Posted by Zeptoplix View Post
I must have a shorted output now though correct? Ill put everything back, and yes that was the first change.
Not unless the short is in the 2 we left connected, which I was gambling against so I am going to presume the outputs are fine until further notice. The components you got the results from disconnecting were the feedback link so that is operating as well. Bear in mind this is incredibly unorthodox troubleshooting but it at least tells me a few things without having it in front of me. Once you get everything resoldered you'll want to power it up once more with a measurement just to verify that nothing was made worse. I'll assume it wasn't, but just be sure.

Next, clamp your negative meter probe down in the speaker ground terminal and leave it there. You will use no input source for any of this, no speakers hooked up.

1) turn the bias pot fully counter clockwise.
2) note the measurement at the + speaker terminal (post it as well, including the polarity the meter is reading +/-)
3) measure and post the voltage at the gate of q42 & the gate of q10 (be as exact as possible.)
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Old 10th March 2013, 09:45 PM   #63
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Hi,

We actually left four connected; there are two that do not have an emitter resistor on them, one on the positive and on on the negative rail.

Things have went from bad to much worse. Last night when I was working on the amp, my desoldering braid managed to get under the board and it shorted against a capacitor and now I have +38VDC on speaker out.

I've pulled all the of the 2SC3263's from the positive rail. The voltage only dropped to +29VDC.
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Old 11th March 2013, 12:06 AM   #64
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Awesome.. What cap was it and what was it shorted to? itself? across the pcb? You never gave me my measurements at the other two points, you need to keep your work area open and clean and if you have things missing from the PCB it helps to tell me that.
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Old 11th March 2013, 12:14 AM   #65
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I do not know which cap it shorted to, or what it hit as it did not arc it self together. I have an idea which cap it is, but I have had a hard time removing it from the board.

Also I have not moved forward with the extra tests due to the new problem of +38VDC.

I pulled all the outputs on the positive rail, and the voltage only dropped down to +29VDC.

When we originally started testing, the board was complete and no parts were missing.
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Old 11th March 2013, 12:24 AM   #66
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Ok,

Put as many things as you have BACK in the PCB, perform test #3 in post #62
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Old 11th March 2013, 01:02 AM   #67
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Ok, I'll do so in a bit when I get back from supper. I reinstalled everything as it was originally. I have +40VDC on the output again.

Also, will I be turning V1 or VR2?

Last edited by Zeptoplix; 11th March 2013 at 01:04 AM. Reason: Added info.
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Old 11th March 2013, 04:29 AM   #68
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+38VDC before any adjustments.

+38VDC with the pot turned fully counter clockwise.

Q42 is a 2SC3263 and it does not have a gate, it has base collector and emitter. I tested on the emitter and got around +25.8VDC. I know you want precision, however it does not settle on one number, it constantly fluctuates down.

Q10 is a 2SA1294 and it does not have a gate, it has base collector and emitter. I test on the emitter and got around +25.8VDC.
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Old 11th March 2013, 06:45 AM   #69
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gate = base. I know, semantics.. I figured you might have guessed. I need the measurements at the bases.
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Old 11th March 2013, 05:20 PM   #70
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Of course out of three possibilities, I guess wrong.

On the base I get +38.5 on Q42
On the base I get 19.3 on Q10

I will have to confirm the polarity on Q10, I tested quickly this morning before coming in to work.

Again, this is as accurate as I can get, since these numebers constantly drop by a little bit the longer that I I hold the test prob in position.
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