Finale 1949 ZENITH AM/FM Tube Radio I picked up a few years ago finally on the bench. In Part 2 the AM alignment was completed and now we move on to the FM alignment - and uh-oh! Did this radio project just brick? Includes FM band alignment, FM detection, FotoPhalse, design problems, history of FM radio, etc. Enjoy Part 3.
See the checklist which appears when status changes, for tracking what is discovered that needs addressing in Red, followed by Green when resolved.
NOTE: This is not instruction, it is for entertainment for people like me who enjoy watching projects and the experiences gained. If you attempt to do any of the things in this video you are at your own risk. I am using special tech-bench safety equipment not detailed here so don't take for granted you can just plug these old items in safely without them being checked and repaired correctly. Check out the link below to Mr Carlson's Lab video below.
ACKNOWLEDGEMENTS AND REFERENCES:
[note: am in no way representing how these folks have shown doing these things - I don't even think they would approve.]
Schematics: Sams Publishing , Riders
Thanks to shango066 for championing the approach of "fix it first", before mass re-capping. See shango066 for many examples of that approach.
@shango066
Awesome discussion of bench safety including variacs and isolation transformers by Mr Carlson's Lab (highly recommended):
https://www.youtube.com/watch?v=XBsQ3sZ45Fk
@MrCarlsonsLab
Modification method for a commercial Tripp Lite isolation transformer for tech-bench use by Todd Harrison, his channel is called ToddFun:
https://www.youtube.com/watch?v=11Yve2ijWyk
@ToddFun
Camera: Canon G7X Mark III
Mic: Rode Micro
Video Editing Software: Power Director
Video Editor: just me
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