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Old 2nd January 2013, 12:33 AM   #21
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Cap measures 1uF, marked 105 630V.
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Old 2nd January 2013, 12:54 AM   #22
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If you place both probes on the same speaker terminal, do you get a perfectly clean trace that is precisely on the reference line?

If you connect a dummy load to the amp, does the current draw increase?
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Old 2nd January 2013, 04:32 AM   #23
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Quote:
Originally Posted by Perry Babin View Post
If you place both probes on the same speaker terminal, do you get a perfectly clean trace that is precisely on the reference line?

If you connect a dummy load to the amp, does the current draw increase?
I pulled the inductors, will check them on the lcr meter at work.


If I connect a load the amp will pull 30 amps immediately upon a signal being applied.
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Old 5th January 2013, 02:33 PM   #24
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With both probes on the + speaker terminal I see this waveform.

Click the image to open in full size.

Scope set to Add, channel 2 inverted, 50V/div, maybe 10uS/div
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Old 5th January 2013, 05:29 PM   #25
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Something is wrong. In differential mode, if you place the probes on the same point, the trace should not be deflected (should remain a straight line at the reference). It could be that the probes aren't matched well enough. Try placing them on a 12v DC source to see if they work properly. It could be a high-frequency response issue with one of the probes.
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Old 5th January 2013, 07:19 PM   #26
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Cal pot was messed up. Here is the output signal with 1khz input. Current increases until the signal starts to clip, then slowly drops.

Click the image to open in full size.
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Old 5th January 2013, 08:50 PM   #27
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Did you find a problem with the inductors?

What was their inductance?

Does it still draw excessive current when you connect a load to it with no input signal?
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Old 5th January 2013, 08:58 PM   #28
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Quote:
Originally Posted by Perry Babin View Post
Did you find a problem with the inductors?

What was their inductance?

Does it still draw excessive current when you connect a load to it with no input signal?
The inductors measured 20uH I believe, don't think it was 20mH.

If I load the output with 4 ohms the clip circuit is tripped. Then I get no output.

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Old 5th January 2013, 09:05 PM   #29
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What happens if you power it up with the load already connected?
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Old 5th January 2013, 09:16 PM   #30
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Clip light comes on, right away.
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