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Help with CSP (Read 2357 times)
Mr Content
Ex Member



Help with CSP
04/28/06 at 06:17:38
 
Hi Guys. I am going to try and fix my pre myself. I have changed all the tubes, and they all light up and get warm, but there is no sound. Where should I check next. I have a digital multimeter, and half a brain. Grin Thanks for your help. Smiley

Mr C
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gnat leader
Ex Member



Re: Help with CSP
Reply #1 - 04/28/06 at 07:28:28
 
Hi C,
Wish I could help ya but I don't know where to start.

Btw, thanks to  your comments my Charlize project is underway.
Will prob use it for a second system. What mod's have you done to yours?  I've almost got the chassis work  finished and ready to start soldering...

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« Last Edit: 04/28/06 at 07:30:44 by Brad »  
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Mr Content
Ex Member



Re: Help with CSP
Reply #2 - 04/28/06 at 08:00:13
 
Nice case Brad. Where did you get it. I tried a few different brand caps, but in the end went back to the caps that came with it. Different caps = different flavors, but not better. The biggest improvement was soldering the input IC's and speaker cables straight to the board. Also, don't worry about caps in the supply line, I tried lots of different values up to 10,000uf, and like it much better without any. Give it about 50 hours and try it in your main system. Thanks for for the reply. Grin

Mr C
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selmerdave
Ex Member



Re: Help with CSP
Reply #3 - 04/28/06 at 13:42:12
 
I would measure the plate voltages on each of the tubes, so power it up upside-down or on it's side with the bottom off.  *DO NOT* touch anything on the inside (with your fingers), but measure the voltages to ground at pins 1 and 6 of each of the 6922's (they are what it uses, right?).  These are DC voltages.  Be careful not to touch other things with the multimeter probes (try not to short other parts together).  I'm not sure what the design voltages would be, but if you're getting no voltage to the plates that would be a sign of something amiss in the power supply.

Dave
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Mr Content
Ex Member



Re: Help with CSP
Reply #4 - 04/28/06 at 15:32:41
 
Thanks Dave. I will do that first thing in the morning. Smiley

Mr C
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Mr Content
Ex Member



Re: Help with CSP
Reply #5 - 05/09/06 at 04:04:44
 
I am glad to tell everyone my CSP is now working again, dead quiet and sounding wonderful again Grin

Mr C
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veryoldcat
Ex Member



Re: Help with CSP
Reply #6 - 05/09/06 at 05:47:39
 
waddidya do that fixed it, Nigel?

Karl
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Mr Content
Ex Member



Re: Help with CSP
Reply #7 - 05/09/06 at 10:04:15
 
Hi Karl, a wire had come of the rectifyer base. Easy fix, now I want to mod it. I remember Steve saying you could take it to the next level, so I wanna Grin

Mr C
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ado420
Ex Member



Re: Help with CSP
Reply #8 - 05/09/06 at 19:40:21
 
all u need now is a Zbox to mod alongside it, and then you'll be singing with more correct tone  :D
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Mr Content
Ex Member



Re: Help with CSP
Reply #9 - 05/10/06 at 09:09:35
 
Getting there Smiley

Mr C
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