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-   -   Crown D75 snap, crackle, pops (https://www.diyaudio.com/forums/solid-state/351680-crown-d75-snap-crackle-pops.html)

Michael F 26th March 2020 02:34 AM

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 :)

rayma 26th March 2020 02:47 AM

Would have to be the C101, unless the pot is just worn out.

ubergeeknz 26th March 2020 03:37 PM

You need to remove any unwanted breakfast cereal mascots. If you can do that I'm sure it will sound grrrrrreat again

[emoji1787]

indianajo 26th March 2020 08:53 PM

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

Michael F 26th March 2020 11:26 PM

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 :)

rayma 26th March 2020 11:47 PM

Quote:

Originally Posted by Michael F (https://www.diyaudio.com/forums/solid-state/351680-crown-d75-snap-crackle-pops-post6135898.html#post6135898)
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.

Michael F 27th March 2020 12:10 AM

What role does that cap play exactly?

rayma 27th March 2020 01:39 AM

Quote:

Originally Posted by Michael F (https://www.diyaudio.com/forums/solid-state/351680-crown-d75-snap-crackle-pops-post6135957.html#post6135957)
What role does that cap play exactly?

Input blocking capacitor, just after the level control.


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