| challenger volume issue [message #18191] |
Sat, 16 February 2013 15:08  |
gwedo1971
Messages: 9
Registered: February 2013
Location: Taylorville, IL.
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Junior Member |
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First off i would like to say hi to everyone. im new here and thanks for having me, well i just got my hands on a very super clean almost mint kustom challenger combo (black) with cover and footswitch its been hiding in a closet since 1973 (he thinks anyhow) i got it home tryed it out and it works sorta typical rca jack corrosion and so on any way tor it down new switch, grounded power cord, cleaned pots and jacks, and all works great other than the volume does not turn down all the way, pulled the pot hand cleaned it put it back and same thing puled it again got a new cts 250k had to swap the d shaft into it tests good re-installed and same thing volume just dont go to zero is this common for these amps or do i have somthing else wrong.
thanks
eric
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| Re: challenger volume issue [message #18192 is a reply to message #18191] |
Sat, 16 February 2013 15:46  |
Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN
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Senior Member |
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YES! They got the name correct on them, they are a challenge to keep going. I have owned a bunch of these, I love them, but I hate them too. They are one of the best sounding small amps made by Kustom, but they are not reliable.
They have a funny way of letting you down when you need them. Mine would work for 5-6 months and then go to crap. I would get it repaired and then something else. then some thing else. and then and then and then and then. I would get it fixed and sold it. I had 4 at one time and found the most reliable one and kept it and the rest went. I saved the mint condition one.
[Updated on: Sat, 16 February 2013 16:02] Report message to a moderator |
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| Re: challenger volume issue [message #18193 is a reply to message #18192] |
Sat, 16 February 2013 16:03 |
gwedo1971
Messages: 9
Registered: February 2013
Location: Taylorville, IL.
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Junior Member |
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it works great and sounds awesome its just odd that it wont turn all the way down i found a schematic so ill be pulling the poor thing apart again to do some testing also i see people saying its 25 watts but this schematic says its 50 
[Updated on: Sat, 16 February 2013 16:04] Report message to a moderator |
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| Re: challenger volume issue [message #18279 is a reply to message #18191] |
Tue, 26 February 2013 11:54 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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I must have an older schematic, there's nothing about a diode between pins 8 and 9. In fact pins 8 and 9 are connected together on mine.
Well, the amp was working before, so it's something that happened when you did the work. Go back and double check everything that you did and hope that the 540 chip is still okay.
Carefully take voltage readings and compare them to the schematic.
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| Re: challenger volume issue [message #18281 is a reply to message #18191] |
Tue, 26 February 2013 13:14 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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That's a drag. I see them on eBay NOS all the time. Maybe Bart will have some more options, as he is Mr. Challenger.
If you do replace it be sure to use the best heatsink that you can fit on it, as it is running at maximum voltage levels in this circuit.
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