04-26-2016, 03:27 PM
(04-26-2016, 02:40 PM)Eric Wrote: Did an alignment and I get a good selection of stations
R3 the vol is 500k I get 530k. I get good range of volume
Checked R5,6,7 with in 15% also checked through the solder connection at both ends and verified with print.
Checked C9,10,11, Lifted one end and verified the value and re-soldered.
I checked the IF coil and they are within a couple of ohms.
Still distorted...... I'd pull my hair out but it's already gone!
Ok so the next step is to get a signal tracer. Basically it's an audio amp with a switchable probe that can put the test signal straight through or through a small signal diode. What this will allow you to do is listen to each stage rf,if,and audio.So all you have to do is listen for the stage where the distortion is coming from. Also great for find which stages are working or not and which if transformer to replace when smd is a problem.
http://www.ohio.edu/people/postr/bapix/sigtrac2.htm
Now one other thought are we talking about about distortion or is the audio garbled sounding? Electrically these can be two different issues. A bad rf ground can cause the sound to be garbled(ac mixing into the control grid circuit) Open or bad connection at the loop antenna can do that.
GL
Terry