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Channel one doesn't work

When I first got the amp I didn't read the little sticker with the tube positions so I misplaced some AT7 with 12AX7 and viceverse, it was working until I drived the amp louder and then the amp make a realy loud ugly sound like something was screaming and tearing at the same time. I turned it off and back on. Channel one was making this strange sound while I was moving the Volume Pot but no sound out of my guitar, channel two was working fine except for Vibrato which wasn't working and still isnt. I did what I should've done in the first place and searched the web for tube postions, removed 1 blown tube at V1 (AT7) and fixed the rest up. now every single tube lights and they're placed as they should but channel one isn't working neither vibrato and the tone is also messed up

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The 12AT7 is usually the driver tube for the tubes before it ( the input channels ). It can also be the driver for the reverb or tremelo channel. I'm not sure what model of amp you have or the manufacturer but there are plenty of places to look on the internet for info. http://duncanamps.com/index.htm is a good place to start. If you can't find the schematic for your amp try and find one that is similar to give you some ideas. If you don't have the basic tools like a volt/ohm meter and a capacitance tester. You might have to consider a pro to look at it. You will be looking for resistors and capacitors in the same circuit as the tubes that you originally mixed up. If its a hybrid solid state/ tube amp you will also need a transistor tester. Of course good soldering abilities are necessary and ABSOLUTELY do not work on the amp while it is plugged in and make sure you properly discharge the filter capacitors in a safe and proper manner before touching the circuit. All the info you need to sucessfully do it yourself is available at the library or on the net as long as you are confident in your abilities and first and foremost work in an absolutely informed and safe manner. Hope this helps.

Posted on Jul 16, 2009

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Do you turn on standby every time and wait for the tubes to heat up first? If you don't, it can severely damage the tubes.
But a common cause of this could be just old tubes. Like any other piece of technology, tubes get old. If you like to play your amp LOUD then they wear out a lot quicker. You have to replace tubes every now and then. Because I'm not there to check out your amp, I can't give you an exact answer but it sounds like that's the problem. This isn't always a bad thing. You can make the sound of your amp exponentially better with nicer, new tubes. Your amp has 12AX7 tubes. Very common tubes to use actually. I'm not sure what kind of music you play, I'm assuming mostly rock and blues. But here is a list of tubes and reviews on them.
http://thetubestore.com/12ax7review.html
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Upkeep on a tube amp:
http://www.ehow.com/video_4438295_replace-tubes-guitar-amp.html
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