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In Reply to: RE: So what have I got wrong this time? posted by vinnie2 on May 25, 2016 at 09:20:17
vinnie2, you gotta remember that the output stage and the second 26 stage are 180 degrees out of phase when drawing from the supply whereas the input or first 26 stage and the output are in phase. Add the difference in signal levels and this why you want to decouple the input stage. The tail will wag the dog, so to speak.
Decoupling both input and driver stages generally increases the supply impedance of the driver stage and doesn't sound as good as just decoding the input stage.
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Is it necessary to decouple if the second stage is choke loaded or IT coupled from the plate of second stage?
Not sure I follow what your asking...
I'll have to take your word for it. After I got things working again (see update), I tried it both ways and was not able to hear any real difference. Of course I did not listen very long and I did not try a lot of different types of music, so it may be there. I will have to remember that if after I finish building it I want to make some mods. Besides that my ears are 69 years old now, and who knows what they are not telling me! I left it without decoupling just in case it does make a difference.
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