Posts: 15
Threads: 3
Joined: Feb 2020
City: KALAMAZOO
State, Province, Country: MI
Hi, all. So I recapped this set a while back and had all kinds of problems with whistles and stations coming in all over the dial. I went back through it today. I did an alignment and it's much better, but not right. 590 comes in well, but can be heard through much of the the lower end of the dial though quietly. 950 and 980 come in and it seems okay above there through the rest of the dial. The antenna trimmer doesn't really peak. tightened all the down it drops and as you back it off stations come in better, but it doesn't peak. The IFs peak. I used orange drops for all of the non-electrolytic caps and ceramic disks for C401 and C201. New electrolytics. Any ideas?
Posts: 7,215
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
Sounds like you've got a problem with the loop ant. Not connected to the proper terminals.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 15
Threads: 3
Joined: Feb 2020
City: KALAMAZOO
State, Province, Country: MI
I don't see how I could have connected the loop antenna incorrectly. One side connects to a terminal on top of the tuning gang and the other connects to a terminal nearby with a wire that goes inside the chassis. I followed it and it goes to the IF cans like the schematic shows. No other places to connect. The loop has continuity, so no broken wire in the loop.
Posts: 599
Threads: 8
Joined: Apr 2018
City: S. Dartmouth
State, Province, Country: MA
Quote:MarkinK-zoo The antenna trimmer doesn't really peak.
That is a sign there is a problem in associated circuits with that trimmer...
Do the circuit troubleshooting in that area with a conventional analog VOM.. Continuity with a DVM could be misleading. Most ANT/RF coils have a low resistance. Look for ground to chassis via rivets, solder them to the chassis using an active flux and an iron with a large copper bit (bolt)... GL chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
(This post was last modified: 11-14-2020, 06:58 PM by
Chas.)
