Mission Cyrus One

gihe · 13th July 2010, 12:17 AM

Hello
Been lurking in these forums for a while but now I actually need some personal advice!

A couple of days ago, my trusty Mission Cyrus One amplifier suffered a drop in volume on the right channel. I'm having to compensate by adjusting the balance on my mixer.

Given that the amp is over 20 years old, does anyone have an idea what the usual suspects are in such a case?

Thanks

hardwareguy · 13th July 2010, 07:10 AM

Possibilities:
Dirty potentiometers
Dried up electrolytics in the signal path
Sulfide corrosion on switch contacts in the signal path
A weak transistor in the input stage

gihe · 13th July 2010, 08:26 AM

Thanks hardwareguy
There's no balance control on this amp and no crackling coming from the stepped volume pot. I also tried several inputs (CD, Aux, Tape) and the volume reduction was evident on all of them. Nevertheless, I'll check out your suggestions.

tinkerbelt · 26th July 2010, 07:28 AM

Did you find the problem? Someone on another forum has the same trouble with a Cyrus One.

13th July 2010, 12:17 AM	#1
gihe diyAudio Member Join Date: Jul 2010	Mission Cyrus One Hello Been lurking in these forums for a while but now I actually need some personal advice! A couple of days ago, my trusty Mission Cyrus One amplifier suffered a drop in volume on the right channel. I'm having to compensate by adjusting the balance on my mixer. Given that the amp is over 20 years old, does anyone have an idea what the usual suspects are in such a case? Thanks

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13th July 2010, 07:10 AM	#2
hardwareguy diyAudio Member Join Date: Apr 2009	Possibilities: Dirty potentiometers Dried up electrolytics in the signal path Sulfide corrosion on switch contacts in the signal path A weak transistor in the input stage

13th July 2010, 08:26 AM	#3
gihe diyAudio Member Join Date: Jul 2010	Thanks hardwareguy There's no balance control on this amp and no crackling coming from the stepped volume pot. I also tried several inputs (CD, Aux, Tape) and the volume reduction was evident on all of them. Nevertheless, I'll check out your suggestions.

26th July 2010, 07:28 AM	#4
tinkerbelt diyAudio Member Join Date: Jul 2010 Location: North East Scotland	Did you find the problem? Someone on another forum has the same trouble with a Cyrus One.

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