Distorted output [message #16770] |
Thu, 08 March 2012 14:37 |
cassent5150
Messages: 341 Registered: August 2009
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Senior Member |
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I have a K200-2 I'm working on and I'm having a problem with the preamp signals when they are both hooked up. Each channel sounds great when hooked up independently. This came in as an empty chassis with a 303 board and face plate. I robbed the transformer, rectifier, power filter caps and output section from a K-III (PC-5065). I got the 303 up and running and installed a PC-105 in the non effects side and ran each pre amp outputs through a 33 K resistor and hooked them together into the input of the PC-5065. I found that this reduced the signal a bit too much. I went strait in with no resistor and had plenty of volume on the 105 but the 303 is dim and distorted. I tried putting resistance in the 105 output but can't get the distortion out of the 303 unless I totally unhook the 105. The 303 is clean and strong then. Anyone have any ideas?????
Steve C
[Updated on: Thu, 08 March 2012 14:38] Report message to a moderator
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Re: Distorted output [message #16777 is a reply to message #16773] |
Fri, 09 March 2012 00:24 |
cassent5150
Messages: 341 Registered: August 2009
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Senior Member |
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I replaced both caps at pre amp output wire and voltage is .05+ and .02+. The caps on both boards were in backwards compared to a good PC-105 I had handy. We have clean signal on both channels. I think we're good now. Thanks for the advice!!! Steve C
Steve C
[Updated on: Fri, 09 March 2012 00:29] Report message to a moderator
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Re: Distorted output [message #16778 is a reply to message #16770] |
Fri, 09 March 2012 01:20 |
chicagobill
Messages: 2006 Registered: April 2003
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Senior Member |
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Good to hear that it's working.
Just be sure that when you measure the voltage across the cap that it is higher on the positive marked side.
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Re: Distorted output [message #16780 is a reply to message #16779] |
Fri, 09 March 2012 10:03 |
cassent5150
Messages: 341 Registered: August 2009
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Senior Member |
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Yes the simple fixes are a pleasure. Now, maybe I can figure out that PC-900 with the darn + voltage in the output. I'm cooled off enough to give it a rational look over. Steve C
PS Thanks chicagobill for the tip on the higher voltage at the + side of the outputs coupling cap
Steve C
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