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Senior Member
Username: edwin

Post Number: 1774
Registered: 5-2002
Posted on Monday, May 26, 2014 - 2:59 pm:   Edit Post

Hi all,
I've discovered that my ancient DS-5 has gotten noisy. When I replace it with the DS-5R, all is quiet. The noise is not hum, it's more like weird hash, I guess it's possible it's the filter caps (it is pretty old, I don't remember if I've replaced the caps or not), but my understanding is that bad filter caps introduce hum, not hash.

I'll take a look inside, but I thought I'd see if anyone has experienced anything similar.

Senior Member
Username: sonicus

Post Number: 3403
Registered: 5-2009
Posted on Monday, May 26, 2014 - 3:26 pm:   Edit Post

HI , Edwin ,I have heard a variety of noise from bad caps. I have replaced caps in the channel strips of a Soundcraft analog board and cut rid of such noise. As long as you are in there perhaps replace the full bridge rectifier for just a few dollars more maybe .

Usual disclaimers ___ (lol)

Senior Member
Username: keith_h

Post Number: 2003
Registered: 2-2005
Posted on Tuesday, May 27, 2014 - 5:38 am:   Edit Post

What wolf said. I don't have an original box but have had the stereo/mono switch on my DS-5R cause noise when I used it after a long period of disuse. After exercising the switch it cleared up.

Senior Member
Username: edwin

Post Number: 1775
Registered: 5-2002
Posted on Tuesday, May 27, 2014 - 8:00 am:   Edit Post

Thanks, guys. I'm pretty familiar with caps doing funny things when they go bad, but the caps in a channel strip function differently from power supply caps. Bad power supply caps should just create hum in cases like this. But, I guess it can't hurt to replace them after so many decades. I'll try cleaning the switching jack, first though. That might be a source of something like I'm hearing. If I were to compare it to anything I've heard before, it sounds a bit like what you get when the plate resistors on a blackface Fender go bad.

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