02-04-2019, 10:55 AM
on your slug tuning for the FM part........something i had happend to me.....
on my zenith, its fm is slug tuned but since i did not know what i didnt know,, i did a modification.
the metal plate atop the tuning cap seemed to be "not following" my tuning properly,, it was sorta delaying in dropping down the slugs into the coils. i zip tied a weight to the metal plate i called an "elevator",,, cause i am not an expert..
then... i noticed on some other slug tuned FM sets there is a spring that pulls the elevator back down.
on your set i notice your chassis sits at an angle,, so..... make doubly sure that the elevator is following the tuning dial without any delays or hang ups.
i found a spring,, cut it to length and installed on my set to always keep some degree of reasonable tension on the elevator "with the slugs all the way *DOWN*".
not sure if this applies to you or not but pay attention to how your slugs follow the tuning knob.
Also,, on your tuning cap when you align the FM,, like i did, you will notice that you can jump forward to jump forward to just the two adjustments on the tuning cap especially if your already really close or split the difference on the AM vs FM dial needle location.
one mica cap moves your station either left or right of what you have the needle on and the other cap increases or decreases the audibility.
find a station on fM from a modern radio then find it on your tube radio...
observe where your needle is pointing...
if your really close then you can simply adjust FM station as needed the two mica caps on your tuning cap.
if your way the heck off........ well..... then you align.
on my zenith, its fm is slug tuned but since i did not know what i didnt know,, i did a modification.
the metal plate atop the tuning cap seemed to be "not following" my tuning properly,, it was sorta delaying in dropping down the slugs into the coils. i zip tied a weight to the metal plate i called an "elevator",,, cause i am not an expert..
then... i noticed on some other slug tuned FM sets there is a spring that pulls the elevator back down.
on your set i notice your chassis sits at an angle,, so..... make doubly sure that the elevator is following the tuning dial without any delays or hang ups.
i found a spring,, cut it to length and installed on my set to always keep some degree of reasonable tension on the elevator "with the slugs all the way *DOWN*".
not sure if this applies to you or not but pay attention to how your slugs follow the tuning knob.
Also,, on your tuning cap when you align the FM,, like i did, you will notice that you can jump forward to jump forward to just the two adjustments on the tuning cap especially if your already really close or split the difference on the AM vs FM dial needle location.
one mica cap moves your station either left or right of what you have the needle on and the other cap increases or decreases the audibility.
find a station on fM from a modern radio then find it on your tube radio...
observe where your needle is pointing...
if your really close then you can simply adjust FM station as needed the two mica caps on your tuning cap.
if your way the heck off........ well..... then you align.
