Crest vs-900

SS64 · 31st January 2012, 07:48 PM

Ok started a new thread because the other one was soo old. Ok here's my problem. Just picked up this amp. brought it home and found this. Channel A seems to be perfect. But channel B seems have a issue. When a relatively low signal is applied the channel sounds ok. but as more signal is applied the clipping light comes on relatively quick and starts to sound rough around the edges. With even more signal applied the amp goes into protect. as soon as the drive is reduced the amp comes out of protect and continues to play.

whats going on?

Original Burnedfingers · 1st February 2012, 10:28 AM

Do you have a scope?

Been years since I owned a Crest VS900 power amp.

You need to look at the front end of the amplifier. I believe there is a 5532 op amp in the front end. That is where I would start.

I believe that when I took a good hard look at the one I had my supply feeding the op amp had a problem that I corrected and it worked fine after that.

SS64 · 2nd February 2012, 03:03 AM

Ok thanks. I have to see if my scope still works. I took a break form the audio relm for awhile.

rizqi · 2nd February 2012, 03:29 PM

any Schema?

djk · 5th February 2012, 07:25 AM

Send me your e-mail address and I will send the schematics.

SS64 · 8th February 2012, 01:58 AM

Scope is broke. I'm just going to replace the sk chip and see what happens..

rizqi · 8th February 2012, 08:36 AM

Quote:

Originally Posted by djk

Send me your e-mail address and I will send the schematics.

ugho_mdlx@yahoo.com

31st January 2012, 07:48 PM	#1
SS64 diyAudio Member Join Date: Mar 2008	Crest vs-900 Ok started a new thread because the other one was soo old. Ok here's my problem. Just picked up this amp. brought it home and found this. Channel A seems to be perfect. But channel B seems have a issue. When a relatively low signal is applied the channel sounds ok. but as more signal is applied the clipping light comes on relatively quick and starts to sound rough around the edges. With even more signal applied the amp goes into protect. as soon as the drive is reduced the amp comes out of protect and continues to play. whats going on? __________________ It isn't fun unless it can kill you!

2nd February 2012, 03:03 AM	#3
SS64 diyAudio Member Join Date: Mar 2008	Ok thanks. I have to see if my scope still works. I took a break form the audio relm for awhile. __________________ It isn't fun unless it can kill you!

5th February 2012, 07:25 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	Send me your e-mail address and I will send the schematics. __________________ Candidates for the Darwin Award should not read this author.

8th February 2012, 01:58 AM	#6
SS64 diyAudio Member Join Date: Mar 2008	Scope is broke. I'm just going to replace the sk chip and see what happens.. __________________ It isn't fun unless it can kill you!

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1st February 2012, 10:28 AM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Do you have a scope? Been years since I owned a Crest VS900 power amp. You need to look at the front end of the amplifier. I believe there is a 5532 op amp in the front end. That is where I would start. I believe that when I took a good hard look at the one I had my supply feeding the op amp had a problem that I corrected and it worked fine after that.

2nd February 2012, 03:29 PM	#4
rizqi diyAudio Member Join Date: Nov 2011 Location: central java	any Schema?

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