#1
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2 AM/FM Pocket Transistor Radios from the early 1980s having issues
Hello everyone, I have recently received from an older lady at church a couple of AM/FM Pocket Transistor Radios from about the early 1980s one is a GE Model 7-2582G and the other one has no model number but has the designation of Imperial BY SUPERSCOPE on the front of the case. Anyways I'm not too sure what the lady did to these radios if anything at all but both of these radios have the same exact issue and that is that they both have extremely distorted audio, its so badly distorted that the audio actually cuts in and out sometimes to the point that nothing can be heard at times. I'm just curious as to what might be causing these two completely different branded radios to have the same the same distorted audio issue.
Any help would be appreciated. Thanks, Levi Last edited by Captainclock; 04-27-2016 at 09:31 PM. |
#2
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Caps, and sometimes bad resistors....If they are push-pull audio and one of the output transistors is bad that that can sound bad too. Alignment could also be an issue, but unlikely if in both bands.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#3
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The other one is probably a more conventional design. My vote would go for dried out electrolytics. |
#4
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UPDATE: I replaced the electrolytics in the GE Radio and it still has garbled and distorted audio so I'm not quite sure what to do next, I'm hoping its not one of the output transistors because if it is then its probably not going to be worth my time to repair it because those output transistors are quite expensive. Last edited by Captainclock; 04-28-2016 at 05:58 PM. |
#5
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The distortion is in both bands so its unlikely to be an alignment issue, especially in both radios, my vote is dried electrolytics because they both are from the same time period, although that doesn't explain why these two radios are having issues but not my old Panasonic and Zenith AM/FM transistor radios (which are both from the 1970s).
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Audiokarma |
#6
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Speakers are rubbing & sticking. Plug in an ear phone to test.**
** Tech Tip. Sometimes on radios & cheap stereos with distortion plugging in headphones make it sound OK BUT the outputs are bad. Its caused by the decreased load on the amp. The best test is remove speaker & sub a known good on. 73 Zeno |
#7
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Just a wild guess, if they both are misbehaving, are you using the same 9V battery in both of them?
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#8
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Yes I was using the same 9V Battery and I did end up subbing a known good battery and it turned out it was the battery causing the problem, turns out the battery I was using was bad so I subbed with a known good 9V battery that was only ever used for battery backup on clock radios and sure enough the radio worked fine! Go figure...
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#9
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BTW weak batteries show up on FM first with distortion & drifting due to the greater load on circuits. BTW #2 Superscope was a Sony product, mostly small stuff like radios, tape etc & built better than average. 73 Zeno |
#10
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Audiokarma |
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