Question about Car Audio & Video
I have an old, original AM car radio c 1972 installed in a MGB. The radio is marked Bendix 2BAMBL. Since it's the radio that came with the car I'm trying to fix it.
The unit powers up OK. When turned on it ''squeals''...probably 3Khz to 5 KHz tone. The audio amp works. I can find and hear one or two AM stations very weakly (they are local stations so should be OK).
The radio schematics are available online thru Sams but before I lay out $30 I'm just wondering if a knowledgable AM radio receiver person could suggest possible problems. Could it be something with the IF section?
Having a high pitch whistle shows that the unit is somewhat unstable somewhere in the circuitry causing it to oscillate where it shouldn't, due to one or more components going faulty. What I would suggest is open up the unit, clean the circuit board thoroughly and replace all the electro capacitors with ones of same value, sometimes problems occur in radios this old because the capacitors dry up, like oscillation may happen if the capacitor that is used to smooth the voltage that feeds the automatic RF gain loses value or goes open circuit. Sometimes IF transformers can go open circuit at random (which can cause oscillation and weak signal too), and so do transistors, which can be hard to track down unless you have an oscilloscope?!? Are there any cracked soldering joints? to check for dry joints; use a plastic tool to tap, press, and rub on the solder side of the board. Having all the gear??? You go through each stage to see if it is working properly. Dont fret too much if you cant fix it yourself due to not having the gear, sometimes multimeter measurements may help, and also blindly poking your finger around... maybe, but it is very challenging and does not find all faults, if you have any friends who are Amateur radio operators, they would have the gear to help you as they always tinker with radios and actually make some of their gear, otherwise I am sure that TV repair persons are fully qualified to fix it for you, with a price! have fun ;)
Posted on Apr 01, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jul 14, 2015 | Vtech AT&T CL82313 3 handset cordless...
Oct 21, 2014 | Cars & Trucks
Oct 23, 2012 | MG B Cars & Trucks
Aug 22, 2010 | Motorola VHF 136-151Mhz Antenna VISAR...
Jun 18, 2010 | Radio Shack TRC-521 CB Radio
Sep 12, 2009 | Bendix King Radio Communications
May 19, 2009 | Car Audio & Video
Nov 30, 2008 | 1994 Acura Legend
May 27, 2017 | Honda Car Audio & Video
210 people viewed this question
Usually answered in minutes!