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Old 6th January 2008, 01:05 AM   #1
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Default Need Help With Early 60's Transistor Radio

I'm having a dilemma I hope someone might be able to shine some light on to help solve.

I have an early 60's am transistor radio I'm working on. The first thing I did was recap it figuring that would stop the LOUD sputtering sound (that the volume control wouldn't control).

Well, that didn't work so I also replaced the output transistor (pnp) and that didn't work either. It still sputters obnoxiously.

Does anyone know what this could be and what I should check (replace) next?

Any help would be greatly appreciated!
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Old 6th January 2008, 03:47 AM   #2
crs1 is offline crs1  United States
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first what is the brand &model of the radio and i will see if i can pull up some schematics for it or maybe try you post on solid state ,analogue or every thing Else maybe some one there can help
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Old 6th January 2008, 04:09 AM   #3
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Hi, It's a Bendix model 3TBO.

I have the schematic for it and replaced the electrolytic caps. I was still getting constant "sputtering". I did some more investgating and it turned out that one of the caps had pulled loose from the trace. Once I resoldered it I got rid of the sputtering but now there's just constant static up and down the tuning scale. The volume controls the static but the radio still won't get reception.
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Old 6th January 2008, 05:02 AM   #4
crs1 is offline crs1  United States
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sounds like dirt in the tuner or a bad trim cap try and use some tuner cleaner in it and your pots and trim caps also can use rubbing alcohol
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Old 6th January 2008, 05:45 AM   #5
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Just apply the rubbing alcohol with a Q-Tip?
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Old 6th January 2008, 05:49 AM   #6
crs1 is offline crs1  United States
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yes then cycle the tuner a few times and do it again also do it to you pots but dont cycle the trim caps that would be bad
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Old 6th January 2008, 05:50 AM   #7
crs1 is offline crs1  United States
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if that dont work your tuner or or a trim cap might be bad if it is a trim cap good luck geting it set
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Old 6th January 2008, 05:51 AM   #8
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I'm going to sound really ignorant here but what's a trim cap? I have to learn sometime.
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Old 6th January 2008, 05:54 AM   #9
crs1 is offline crs1  United States
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Quote:
Originally posted by 65blkbkgt
I'm going to sound really ignorant here but what's a trim cap? I have to learn sometime.
no not a bad ? it will look like a screw on a disc with 3 legs that is the best i can describe it i will try to get you a pic of one
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Old 6th January 2008, 06:04 AM   #10
crs1 is offline crs1  United States
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it will look somthing like this
Attached Images
File Type: jpg vcap-16.jpg (2.6 KB, 50 views)
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