(No Subject)

6/21/2009 1:07:08 PMLisa Basson

So I got this Airline portable bakelite, love it, got it working replaced two tubes, needed to solder a speaker wire, and then realised that a bunch of wires were loose, i did not have a soldering iron yet , so my buddy offered to solder them,. ok he is good with electronics..dvd vhs stuff.. i let him.the previous owner had done some hinky thing to the antennia under the bakelite..that is another post :/ so Tim "fixed this too" well I got radio back and when you turn it on no matter what volume or tuning It has this him, a very loud deafing hum WOW, i dont know where to start or what he did...could it not be grounded somewhere, I am new here

6/21/2009 5:50:10 PMSage

:So I got this Airline portable bakelite, love it, got it working replaced two tubes, needed to solder a speaker wire, and then realised that a bunch of wires were loose, i did not have a soldering iron yet , so my buddy offered to solder them,. ok he is good with electronics..dvd vhs stuff.. i let him.the previous owner had done some hinky thing to the antennia under the bakelite..that is another post :/ so Tim "fixed this too" well I got radio back and when you turn it on no matter what volume or tuning It has this him, a very loud deafing hum WOW, i dont know where to start or what he did...could it not be grounded somewhere, I am new here
.............

A model number would help locate the schematic.... Likely it needs to be recapped (ie., all the old capacitors ("caps") replaced). When capacitors that are used to filter the power supply go bad - it can result in a loud, over-powering hum. Also, if the wires to the antenna were not hooked back up correctly - this can result in a hum and distortion. But, again, knowing the specific model may be helpful in coming up with other repair hints and suggestions for you.

PS - please make sure you enter a topic
in the subject line of a new post. Most people here will ignore posts without a subject line....

6/21/2009 9:42:06 PMLewis L

::So I got this Airline portable bakelite, love it, got it working replaced two tubes, needed to solder a speaker wire, and then realised that a bunch of wires were loose, i did not have a soldering iron yet , so my buddy offered to solder them,. ok he is good with electronics..dvd vhs stuff.. i let him.the previous owner had done some hinky thing to the antennia under the bakelite..that is another post :/ so Tim "fixed this too" well I got radio back and when you turn it on no matter what volume or tuning It has this him, a very loud deafing hum WOW, i dont know where to start or what he did...could it not be grounded somewhere, I am new here
:.............
:
:A model number would help locate the schematic.... Likely it needs to be recapped (ie., all the old capacitors ("caps") replaced). When capacitors that are used to filter the power supply go bad - it can result in a loud, over-powering hum. Also, if the wires to the antenna were not hooked back up correctly - this can result in a hum and distortion. But, again, knowing the specific model may be helpful in coming up with other repair hints and suggestions for you.
:
:PS - please make sure you enter a topic
:in the subject line of a new post. Most people here will ignore posts without a subject line....

6/21/2009 9:44:06 PMLewis L

:::So I got this Airline portable bakelite, love it, got it working replaced two tubes, needed to solder a speaker wire, and then realised that a bunch of wires were loose, i did not have a soldering iron yet , so my buddy offered to solder them,. ok he is good with electronics..dvd vhs stuff.. i let him.the previous owner had done some hinky thing to the antennia under the bakelite..that is another post :/ so Tim "fixed this too" well I got radio back and when you turn it on no matter what volume or tuning It has this him, a very loud deafing hum WOW, i dont know where to start or what he did...could it not be grounded somewhere, I am new here
::.............
::
::A model number would help locate the schematic.... Likely it needs to be recapped (ie., all the old capacitors ("caps") replaced). When capacitors that are used to filter the power supply go bad - it can result in a loud, over-powering hum. Also, if the wires to the antenna were not hooked back up correctly - this can result in a hum and distortion. But, again, knowing the specific model may be helpful in coming up with other repair hints and suggestions for you.
::
::PS - please make sure you enter a topic
::in the subject line of a new post. Most people here will ignore posts without a subject line....

OK, a few things we can check without a schematic. What does the hum do when you change the volume control? Does tuning the radio across stations affect the hum?
Lewis

6/22/2009 7:34:37 AMLbasson

No it just hums as soon as it comes on ...loud not the volume or the tuning knob affects it..

6/21/2009 9:44:14 PMLewis - cat got your tongue??

6/21/2009 11:04:17 PMLewis L

: Naw, I've just beeen busy outside, working on the lawn, replaced a broken slab of driveway. The temperature was almost 100 degrees today, and next month it will get really HOT! So I have been busy outsidewhile I can still stand the temperature.
Lewis

6/22/2009 7:46:05 AMLISA BASSON

It is a 84BR-1065A I got the schematic of this site....but it doesnt explain all the wire that are hooked to antennia and into the lid and that brass pieces under bakelite

6/22/2009 8:12:42 AMSage

If your radio hadn't been modified by previous owners - I would suggest the systematic approach Lewis is trying to lead you into..... however, not knowing how it was modified, this may end up being fruitless unless all mods are reversed. Posting a few pictures here would be beneficial in illustrating what you describe.

If you read the text ("General Description") on the schematic, you'll see that the wires in the lid are probably the loop antenna which was purposefully built into the lid. Unfortunately, the schemtic notes reveal that your radio has the type of IF coils that are prone to silver mica migration. That condition, if present, can lead to seriously loud static. That is not an impossible fix - but would likely be difficult for a beginner.

So, post a few clear pictures and let's go from there....

6/23/2009 5:19:51 AMwow thats scarey

:
:If you read the text ("General Description") on the schematic, you'll see that the wires in the lid are probably the loop antenna which was purposefully built into the lid. Unfortunately, the schemtic notes reveal that your radio has the type of IF coils that are prone to silver mica migration. That condition, if present, can lead to seriously loud static. That is not an impossible fix - but would likely be difficult for a beginner.

OK I take some

:
:So, post a few clear pictures and let's go from there....