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Old 19th October 2006, 09:12 AM   #1
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Default kenwood 923

im working on a kennwood 923 old school amp when the gain is all the way down lowest setting amp plays fine as soon as u turn up the gain even a lil bit it distorts like crazy someone told me to replace the preamp drivers i did still the same what sshould i check next all the outputs and power transistors check fine
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Old 19th October 2006, 11:25 AM   #2
Dan2 is offline Dan2  South Africa
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Maybe your input signal is too high. is the amp loud with the gain turned down??
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Old 19th October 2006, 12:11 PM   #3
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Also could be a bad volume pot on the amp.
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Old 19th October 2006, 03:42 PM   #4
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While I'm not familiar with that amp, look for broken foil and connections on any vertical board where it solders to the main board. If the amp is driven to full power when it becomes distorted, you may be losing feedback to a preamp or power amp circuit (could be from a bad pot as was mentioned) or it could be from bad connections.

While you're in it, check the solder connections on the transformer.
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Old 20th October 2006, 11:56 AM   #5
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i found on one of the coils in the pwer supply i re solderd the connections but on one of the pins the trace is burnt off the circuit bord so i scraped a lil off the board to reveal copper but all thats under it is board so i tryed to tace it down further and its just board unerneath so im wondering do they use this lead on the coil or not and if so what do i need to solder it to on that leg its not a trace that runs all over it was just a lil circle around the leg and thats it didnt have traces running to it
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Old 20th October 2006, 12:13 PM   #6
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The main power transformer may have extra pins that do not connect to traces. Inductors typically don't have extra pins but there are exceptions.
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