15-03-2014, 10:09 PM
(15-03-2014, 09:12 PM)richard296 Wrote: Pw I double checked values of components before posting. Your last postings lawrence does this mean that i am doing what you's are asking me correctly. I thought the resistor getting hot was the cause of the sound muffling after ten minutes.thank you richie Or what else can i check.
The resistor will still get hot with 100 ma passing through it, what we need is to get an idea of what level of current would we expect the circuit(s) that it's feeding to be, there are an awful lot of transistors in your unit that can collectively draw quite a lot of current, that is why I suggested much earlier on why it is important to try and establish what circuit(s) it is feeding.
At this point we can only guess what is causing the distortion you reported although latterly you describe it as muffled, muffled to a tech doesn't always mean distortion as I would understand it, to me it could mean no treble response.
As said, if it's distorted as in waveform distortion then a quick check of the collector voltages might be able to tell us weather or not we can continue to run the PA for trouble shooting purposes without risking any serious damage to that stage.
Lawrence.
