Question about Music
Posted by Anonymous on
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Posted on Jan 02, 2017
Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.
Posted on Jul 25, 2009
Nine times out of ten, any problem with an amp having no sound coming out, it's a wiring issue. Make sure all of the wires internal to the amp are propely hooked up. Also, try switching out the quarter inch cord you are using from your guitar to your amp. Could be a bad cable. Unless you have blown the speaker completely, something is loose or not hooked up properly.
Posted on Feb 28, 2009
Are you saying that the only indication that it is running at all is that the fans are running? So the tubes don't light up? No indicators on the front of the amp?
Power supplies that provide multiple voltages, which your amp has, can provide some of the voltages while having a problem that prevents them from providing others, all while not blowing a fuse. If you are not confident in your ability to work on a piece of electronic equipment that has 120VAC coming in and at least 175VDC or more present inside it, bring it to a service center.
The good news is that it is probably not horribly serious. Problems like this can almost always be repaired in a cost effective manner.
Posted on Apr 24, 2009
NEVER use switch cleaner such as DeOxit on pots !!!!!
I have used CRC226 available at Home Depot electrical dept.
I SUSPECT that the resistance element in that pot is cracked. This is common if the knob sustained a hit. Replacing the pot is the only cure if the element is cracked.
Reviewing the schematic, ALL audio passes through the wiper on the HIGH tone pots. If the wiper is intermittent, so will be the sound.
If your unit is solid state amp, the pot looks like a 10K ohm LINEAR taper.
If you have a tube type, then the pot is a 250K ohm LINEAR.
Note that the other tone pots in the units are AUDIO tapers, but the high is a linear taper.
Get repair parts from either DigiKey.com or Mouser.com
Posted on Mar 23, 2010
The next time it stops, unplug the cable from the guitar and touch the tip of the connector with your finger. If the amp hums, then the amp is still working and the problem is in the guitar. If there is no hum from doing this, then the amp has am intermittent.
Try this before it fails to see what to expect in the way of the hum from this test.
Common problems with the amp are OFTEN with a broken input connector or bad switch on the preamp output jack if it has one.
There are MANY other things and without troubleshooting it is hard to steer you to a fix.
Posted on Mar 27, 2010
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