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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 3rd April 2019, 04:37 AM   #101
Chopperbuilder is offline Chopperbuilder  United States
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The left channel is slightly distorted.
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Old 3rd April 2019, 05:53 AM   #102
Perry Babin is offline Perry Babin  United States
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Are you getting your scope back soon?

Distortion is easier to troubleshoot if you can see the distorted waveform.

What's the voltage drop across your three 6 ohm resistors with the 40w lamp in the supply feeding the left channel?
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Old 3rd April 2019, 06:08 AM   #103
Chopperbuilder is offline Chopperbuilder  United States
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I have my scope now. I'm going to try to get the caps for it tomorrow or at least get them ordered. It is still usable at the moment.



Voltage across my limiter is +3.70v with the 40w lamp in the supply feeding the left channel
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Old 3rd April 2019, 06:44 AM   #104
Chopperbuilder is offline Chopperbuilder  United States
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A photo of one of the driver base signals just to show what a heat gun does to a capacitor that needs to warm up to work.
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File Type: jpg 20190403_013849.jpg (867.6 KB, 24 views)
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Old 3rd April 2019, 06:46 AM   #105
Perry Babin is offline Perry Babin  United States
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Beautiful, ain't it.
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Old 3rd April 2019, 06:47 AM   #106
Chopperbuilder is offline Chopperbuilder  United States
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Ain't that the truth!
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Old 3rd April 2019, 06:59 AM   #107
Chopperbuilder is offline Chopperbuilder  United States
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So should we look for what in the audio circuit is causing the PS FET's to heat up or look for what is causing the distorted output? Or if they are maybe one in the same...
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Old 3rd April 2019, 07:08 AM   #108
Perry Babin is offline Perry Babin  United States
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You need to post a scope image of the distorted waveform. Try with no load. The lamp will limit current so it won't be able to drive very hard without distorting.

If there is more than about 1v across the lamp at idle, I think something in the audio section is drawing too much current.
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Old 3rd April 2019, 07:57 AM   #109
Chopperbuilder is offline Chopperbuilder  United States
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I'm not doing something right here. I cannot get a waveform (correct waveform) to show on the scope. I tried another amp and still couldn't get it. I'm apparently not hooking something up right...


If I hooked up the multimeter correctly (one lead on each terminal of the lamp plug in) it has +24.95v DC across it.
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Old 3rd April 2019, 08:14 AM   #110
Perry Babin is offline Perry Babin  United States
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Black probe on the RCA shield.

Voltage on all 3 legs of one 6488 and one 6491 on the left channel.
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