| stalker |
Hi,
My Fender champ clone was oscillating when i pushed it to the maximum( hi Trout ):) and desperate, after hours trying to fix the problem, i plugged it into my pc output just to listen to some music to calm my nerves...no oscillation at normal levels but i had to try didn't i? so i pushed it again and now my pc is mute. Soundcard was integrated in the motherboard so i guess now i have to buy a new PC.( :(
Some questions:
What the %$·! did it happen?
Would my soundcard be still alive with a cap in the amp's input?
Thanks. |
|
|
| Giaime |
Hi stalker,
I don't think that an oscillating amp INPUT can do something to your soundcard. Maybe if you connected the speaker output or a line out to your soundcard in, it would harm, but this way... :whazzat:
Maybe you've got a bad solder joint on the sound card output jack, that's an easy fix, I've seen this many times. Otherwise, check your software settings.
Anyway, if you're still suspicious, measure with a dmm the voltage present at your amp input when it's oscillating. It should be zero volts DC and AC with or without oscillation. |
|
|
| karma |
even if the onboard sound card was fried you can add a pci sound card and turn off the onboard in the bios
motherboards still good just stay away from onboard vga:D
caps in the amp's input would be a good idea if your using it on the pc sound card.
i found this out the hard way in the past;) |
|
|
| stalker |
| quote: | | I don't think that an oscillating amp INPUT can do something to your soundcard. Maybe if you connected the speaker output or a line out to your soundcard in, it would harm, but this way... |
So what happened? Software is ok, no bad solders.
| quote: | | Anyway, if you're still suspicious, measure with a dmm the voltage present at your amp input when it's oscillating. It should be zero volts DC and AC with or without oscillation. |
The amp doesn't oscillate anymore so ...
The souncard headphone output doesn't work either nor the internal speaker...just mute:dead:
| quote: | | even if the onboard sound card was fried you can add a pci sound card and turn off the onboard in the bios |
no pci slots ... i was thinking maybe an usb soundcard would work.
Thanks for the replies. |
|
|
| Trout |
| quote: | Originally posted by stalker
Hi,
My Fender champ clone was oscillating when I pushed it to the maximum( hi Trout ):) and desperate, after hours trying to fix the problem, I plugged it into my pc output just to listen to some music to calm my nerves...no oscillation at normal levels but I had to try didn't i? so I pushed it again and now my pc is mute. Soundcard was integrated in the motherboard so I guess now I have to buy a new PC.( :(
Some questions:
What the %$·! did it happen?
Would my soundcard be still alive with a cap in the amp's input?
Thanks. |
Have you determined the source of the oscillation?
| quote: | | The amp doesn't oscillate anymore so ... |
I still have a champ sitting here with a suspected bad oscillation at 3/4 - full volume.
I exhausted every known cure and about 15 replaced parts and have not cured mine. (waiting on the arrival of a new PT)
I have built 5 of those little champs and just love them, But the one here is a real mystery.
I take it with the lack of a PCI slot your using a laptop? I ask because I often use my laptop to drive an occasional amp and If there is a suggested method of input protection for this I would be jumping to try it here too.
Trout |
|
|
| stalker |
Hi Trout:
| quote: | | Have you determined the source of the oscillation? |
Well i did change caps, pots and tubes with no result. Then with the amp oscillating i began to move around the signal wire until it stopped. I must say that it's still on the verge cause if i start touching the insides again the oscillation comes back. In my case it was a matter of a few inches, i didn't follow the original layout, by the way if you want to see it, here it is:
http://www.pisotones.com/TheChamp/5E1.htm
| quote: | | I still have a champ sitting here with a suspected bad oscillation at 3/4 - full volume. |
I know:) Read the whole thread.
| quote: | | I take it with the lack of a PCI slot your using a laptop? I ask because I often use my laptop to drive an occasional amp and If there is a suggested method of input protection for this I would be jumping to try it here too. |
Yes, a laptop. For me it's too late but i still don't understand what went wrong. |
|
|
| Trout |
| quote: | | http://www.pisotones.com/TheChamp/5E1.htm |
That is truly a fine unit. ( Also VERY Valuable) Its very rare to see one in that condition and being a transition Model/Year makes it even more rare. I noticed the lack of a choke as soon as I visited your site.
Looking closely at the pictures, I noticed that 1 of the input jacks appears to be open rather than its normally closed position. ( Might be viewing angle in photo).
I know on my good unit it got very weird with oxidation on a jack, Even started picking up radio signals
:xeye:
Everything inside yours looks great!!
Gene |
|
|
|
