Thank you for the reply j_flanders
That is indeed the section that is/was causing trouble.Everything seemed to be wired as it should and checking all the components values and transistors showed no issues.
Testing it all on the scope with a 400hz sine wave, i found the output from the BBDs was around 3 volts and cleaned the signal up when passing through the first 10k/2nf juction.signal dropped to around 2.6v at the 10k/33nf junction (ok not so bad) by the time it hits the Emitter junction the signal is cut down to about 1.8v. If i took out the transistor completely it was pretty much the same signal.If i measured all the way to the end of the output of the second transistor it came out at about 950mv. I noticed when connecting it into the the expandor it loaded the signal all the way down to 200mv and distorted!
What is strange is when the whole circuit is fired up the signal at the emitters of the transistors shows full signal and slowly degrades down to 950mv. Is there something else on my bread board that could be dragging it all down when the transistors are connected? Couldn’t really find any.
I did go to the effort to take sound samples and scope pictures of the problem. I wasn’t able to log into the site for a few days as it seemed to be down or hacked?? So in the mean time i decided to build a op-amp filter instead and the result was amazingly good! Cleaned the the signal up beautifully and no loading to the expandor and much louder. So much signal that i have pad it back down before the summing amp and increase the repeats feedback resistor back to 100k. So although i was not able to sold the mystery of the transistors what i did use worked alot better after all.
I can still post the scope and sound samples if you wish to see them.
In the mean time! Thanks for your response.
