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challenger hum [message #6561] Tue, 17 January 2006 16:32   oldman93 Messages: 1 Registered: January 2006 Junior Member I'm trying to trouble-shoot a Challenger. When I switch the power on all I get is a low, pulsating hum. Can anyone point me in the right direction? Is it a problem with the transformer? Any suggestions would be helpful. Report message to a moderator

Re: challenger hum [message #6562 is a reply to message #6561] Wed, 18 January 2006 07:52   stevem Messages: 4737 Registered: June 2004 Location: NY Senior Member If you have a volt meter, set it for at least 40 volts DC, not a/c but DC..hook it up across the amps speaker output jack with a cable, or across a speaker, turn on the amp. You will probibly read more than 1/2 a volt dc, which means the driver and or output stage has a problem.If so dont leave the amp on for more than 3 to 4 seconds to limit more damage. Report message to a moderator

Re: challenger hum [message #6565 is a reply to message #6561] Wed, 18 January 2006 11:34 chicagobill Messages: 2005 Registered: April 2003 Senior Member Oldman93, Welcome to the board! I myself have no info on the Challenger, but I doubt that your transformer is at fault here. As Steve points out, it could be a power amp problem, or it could be a power supply problem or a pre-amp problem as well. First thing, try and isolate where the problem is. How loud is the hum? Is the hum affected by changing the volume or tone controls? Does the amp pass an audio signal? Are there any visible signs of damage? Burned or overheated components? Rust or corrosion? All of these questions will help point you in the right direction. If you don't have one, get a copy of the schematic. Check the power supply voltages. Then check the power amp section and continue to work backwards through the amp until you find the fault. There are dangerous voltages inside any amplifier. Work slowly and carefully, and never take on a project that is beyond your abilities. Bill Report message to a moderator

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