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Crown D75 snap, crackle, pops
Crown D75 snap, crackle, pops
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Old 26th March 2020, 02:34 AM   #1
Michael F is offline Michael F  Canada
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Default Crown D75 snap, crackle, pops

When adjusting the attenuators. It used to be much worse prior to Deox-ing them. There is a DC component present while crackling which is of too short duration to be accurately measured.
Can this be the effect of failing capacitors somewhere?
Thanks for looking
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Old 26th March 2020, 02:47 AM   #2
rayma is offline rayma  United States
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Would have to be the C101, unless the pot is just worn out.
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Old 26th March 2020, 03:37 PM   #3
ubergeeknz is offline ubergeeknz  New Zealand
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You need to remove any unwanted breakfast cereal mascots. If you can do that I'm sure it will sound grrrrrreat again

Crown D75 snap, crackle, pops
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Old 26th March 2020, 08:53 PM   #4
indianajo is offline indianajo  United States
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So the rails are +-30 vdc. Is that what you get on + & - terminals of C1, C2?
Warning to newbies, work only with one hand when checking with the power on. Use alligator clip to connect DVM negative to speaker return. >24 VDC across your heart can stop it. Wear no jewelry on hands or neck. 1 vdc @ 30 amps can burn your flesh to charcoal. Touch no metal with flesh until checked <1vdc and unit unplugged from AC.
Volume pots often wear out on old amps.
You can download service manual from eserviceinfo.com
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Old 26th March 2020, 11:26 PM   #5
Michael F is offline Michael F  Canada
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I just downloaded the service manual, C101 and C201 seem like a good place to start looking. I`ll report back with my findings.
Thanks to all who chimed in
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Old 26th March 2020, 11:47 PM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by Michael F View Post
I just downloaded the service manual, C101 and C201 seem like a good place to start looking.
Use bipolar types only. They're overdue for replacement anyway.
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Old 27th March 2020, 12:10 AM   #7
Michael F is offline Michael F  Canada
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What role does that cap play exactly?
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Old 27th March 2020, 01:39 AM   #8
rayma is offline rayma  United States
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Quote:
Originally Posted by Michael F View Post
What role does that cap play exactly?
Input blocking capacitor, just after the level control.
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