Need Help With Early 60's Transistor Radio

65blkbkgt · 6th January 2008, 01:05 AM

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!

crs1 · 6th January 2008, 03:47 AM

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

65blkbkgt · 6th January 2008, 04:09 AM

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.

crs1 · 6th January 2008, 05:02 AM

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

65blkbkgt · 6th January 2008, 05:45 AM

Just apply the rubbing alcohol with a Q-Tip?

crs1 · 6th January 2008, 05:49 AM

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

crs1 · 6th January 2008, 05:50 AM

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

65blkbkgt · 6th January 2008, 05:51 AM

I'm going to sound really ignorant here but what's a trim cap? I have to learn sometime.

crs1 · 6th January 2008, 05:54 AM

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

crs1 · 6th January 2008, 06:04 AM

it will look somthing like this

6th January 2008, 01:05 AM	#1
65blkbkgt diyAudio Member Join Date: Jun 2007	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!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Radio output before transistor amp	Calamaro	Analogue Source	0	10th October 2008 01:00 PM
crystal radio transistor amplifier	Sparky OR	Solid State	2	6th April 2006 01:20 AM
The first pocket transistor radio	jackinnj	Solid State	19	7th February 2006 02:56 PM
radio shack catalog from early 80's	zuki	Parts	3	21st December 2004 01:58 AM
transistor radio??????	jamerick	Everything Else	6	18th November 2002 11:50 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

6th January 2008, 03:47 AM	#2
crs1 diyAudio Member Join Date: Dec 2007	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

6th January 2008, 04:09 AM	#3
65blkbkgt diyAudio Member Join Date: Jun 2007	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.

6th January 2008, 05:02 AM	#4
crs1 diyAudio Member Join Date: Dec 2007	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

6th January 2008, 05:45 AM	#5
65blkbkgt diyAudio Member Join Date: Jun 2007	Just apply the rubbing alcohol with a Q-Tip?

6th January 2008, 05:49 AM	#6
crs1 diyAudio Member Join Date: Dec 2007	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

6th January 2008, 05:50 AM	#7
crs1 diyAudio Member Join Date: Dec 2007	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

6th January 2008, 05:51 AM	#8
65blkbkgt diyAudio Member Join Date: Jun 2007	I'm going to sound really ignorant here but what's a trim cap? I have to learn sometime.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)