This X-202 is destined to end up with my brother to pair with his K-horns, it was full of problems being bone stock when I received it. After a full recap that included HH can caps, screen stability resistors, modded bias setting test points, and new 1% large resistors throughout, it had a dead right channel. I went back and triple checked my solder joints and components, feeling confident all was good, I turned my attention to the controls. After finding a few bad connections on the volume pots, I re soldered them and started to get good sound out of the right channel. Thinking I solved the problem, I put the bottom back on and moved the amp from its side to sitting like it should. I turned it back on and got horrible crackling in the right channel while turning the volume up, but once I turned it past 1/4 volume it cleared up and sounded perfect. I again deoxed all controls and tried again, with this test showing the right channel crackling without even moving it.
By this time I was really frustrated, so it was time to take a step back and breath deeply. I slept on it overnight, and no that doesn't mean I used it as a pillow, but I did think about it enough to consider there could be a piece of junk in the right volume pot that moves around and causes these problems. I decided to blow them out with compressed air, and add deox again. This process cleared up the problem, wheeeew, talk about a relief!
Now after getting things working properly, I notice a couple things that slightly worry me. One is that there is a slight hum in the power supply, I will consider loosening and re tightening all the screws and see if that helps.
The other concern is the two 250 ohm 7 watt resistors I replaced, the temps that I am getting from them is down right scary. My heat gun is showing well over 300 degrees and putting off a pretty good smell of hot electrical odor. I have only seen tubes reading this kind of heat and never something underneath the chassis. Now the original resistors did leave quite a heat stain in this area, but with temps that high, I'm not comfortable until I get some assurance this is fairly normal.
I will test my other X-202 to see how hot these get in that unit, but I don't remember them getting near that hot, it could be just this brand of resistor.
By this time I was really frustrated, so it was time to take a step back and breath deeply. I slept on it overnight, and no that doesn't mean I used it as a pillow, but I did think about it enough to consider there could be a piece of junk in the right volume pot that moves around and causes these problems. I decided to blow them out with compressed air, and add deox again. This process cleared up the problem, wheeeew, talk about a relief!
Now after getting things working properly, I notice a couple things that slightly worry me. One is that there is a slight hum in the power supply, I will consider loosening and re tightening all the screws and see if that helps.
The other concern is the two 250 ohm 7 watt resistors I replaced, the temps that I am getting from them is down right scary. My heat gun is showing well over 300 degrees and putting off a pretty good smell of hot electrical odor. I have only seen tubes reading this kind of heat and never something underneath the chassis. Now the original resistors did leave quite a heat stain in this area, but with temps that high, I'm not comfortable until I get some assurance this is fairly normal.
I will test my other X-202 to see how hot these get in that unit, but I don't remember them getting near that hot, it could be just this brand of resistor.
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