Progress report. Found Q6 installed incorrectly. The amplifier has close to 0 vdc offset both channels. Game over! I want to thank everyone for hanging in there with me.i want to thank Patrick 101 especially for being patient with me ... I even had a few messages from Mr Wayne Coulburn from Pass Labs wow! This has been very educational and i still have lots to learn. I realize that as far as amplifiers go this is yesterdays design and much much better amplifiers out there,but for some reason a cheap broken Soundcraftsmen is hard to pass up. Now i can move on to my next project. thanks again, Frank.
Once you find the problem, its always obvious it would have be so much easier if you had just looked at the right thing first.
BTW, there is word for when what happened here happens in medicine (also sometimes used in other fields): iatrogenesis or iatrogenic (depending on usage)
https://en.wikipedia.org/wiki/Iatrogenesis
BTW, there is word for when what happened here happens in medicine (also sometimes used in other fields): iatrogenesis or iatrogenic (depending on usage)
https://en.wikipedia.org/wiki/Iatrogenesis
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Yes sir, you were right. I am just beginning to learn how to read schematics. Thanks for your help. Frank
Yes. I have learned that the position of semiconductors and understanding a schematic Is very important.
Markw4 ,iatrogenic? Ok your to deep for me man. Once you find the problem, it's always obvious it would've been much easier if it just had been looked at the right thing first....thats The story of my life. Thanks again for your help.
👍 Well, a good number of people who come with their troubles take answers 'til their problem goes away and then disappear into the void, leaving no new insights for those who come after them. You get big points for taking the time to come back with the solution report. Thanks !
He did a good job and in quite short time, considering his only diagnostic tool was a voltmeter. I remember spending much more time on blown amps when I started messing with such things, often just fixing my own faults. Even 50 years later it is still an exiting moment when you build a new amp or hope to have repaired one and power it up. You learn from every fault, just don't repeat them, that is the trick.