12-23-2018, 01:20 PM
Hi all, I don't know if this is the place for this but here goes. Working on a beautiful Magnavox 70s AM/FM 8 track record changer chassis #R321-12CA floor model for a friend. I know it's a dinosaur but it means a lot to him. Anyway, it's a SS unit with lousy AM. I don't know how well these units worked but it should be better than it is. With the volume all the way up, I can barely here 2-3 stations. Did an alignment on it with hardly any improvement. The antenna trimmer has no effect. I have tested all the components in the RF amp section and even replaced the RF amp transistor. Everything leads me back to the antenna circuit which doesn't have much in it. According to the schematic the antenna primary should measure 4 ohms but only measures 2. I know 2 ohms isn't much but in this case it's half of what it should be. The tuning condenser shows no shorts between the plates. If I touch the base of the RF amp transistor it improves greatly. So I guess what I'm asking is anybody have any experience with this unit and how common would it be to have a defective ferrite loopstick antenna? I tried looking on line for a replacement but it is futile. I will be posting in the want adds for this antenna. Thanks!
Ron
Ron
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