I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

Hi Brian

Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.

Philco model A-361 was made from a car radio. Car radios usually have slug tuning.

Norm

:I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

Also try unplugging any computers in your house. Televisions often cause harsh noise in the radio of various sounds, but I find that computers can cause an annoying hum at certain frequencies. When I unplug my computer or pick a circuit in the house that is not on the same phase as the computer, the humming stops.

T.

:Hi Brian
:
: Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.
:
: Philco model A-361 was made from a car radio. Car radios usually have slug tuning.
:
:Norm
:
::I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

By AC line do you mean the actual power line or something else. If the power line, which side?

:Hi Brian
:
: Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.
:
: Philco model A-361 was made from a car radio. Car radios usually have slug tuning.
:
:Norm
:
::I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

Hi Brian

Ideally it would be neutral side of the AC line but try either side. Some radios have a cap from each side of the AC power line to chassis.

Norm

:By AC line do you mean the actual power line or something else. If the power line, which side?
:
:
:
::Hi Brian
::
:: Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.
::
:: Philco model A-361 was made from a car radio. Car radios usually have slug tuning.
::
::Norm
::
:::I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

Thanks. I'll try that out when I get home tonight

:Hi Brian
:
: Ideally it would be neutral side of the AC line but try either side. Some radios have a cap from each side of the AC power line to chassis.
:
:Norm
:
::By AC line do you mean the actual power line or something else. If the power line, which side?
::
::
::
:::Hi Brian
:::
::: Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.
:::
::: Philco model A-361 was made from a car radio. Car radios usually have slug tuning.
:::
:::Norm
:::
::::I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?

Norm
I put in 2 .033 600v caps (I didn't have any .01's), one on either side of the AC line as you suggested and it cleared the hum problem. I can listen to the country oldies station now without the annoying hum. Thanks for the advice.

:Thanks. I'll try that out when I get home tonight
:
:
::Hi Brian
::
:: Ideally it would be neutral side of the AC line but try either side. Some radios have a cap from each side of the AC power line to chassis.
::
::Norm
::
:::By AC line do you mean the actual power line or something else. If the power line, which side?
:::
:::
:::
::::Hi Brian
::::
:::: Try adding a cap between the AC line and chassis of your radio. A .01 mfd @ 600 volts should do the job. This usually eliminates modulation hum heard when a radio is tuned to a station.
::::
:::: Philco model A-361 was made from a car radio. Car radios usually have slug tuning.
::::
::::Norm
::::
:::::I am restoring a Philco A-361 for my stepmother. I have replaced all the paper caps as well as the electrolytics. I have also replaced the resistors that were out of spec. The radio has a humming problem above about 1320 on the dial. The hum will intensify when I tune it into a station. The radio works clearly with no hum below 1320 on the dial. It doesn't have the usual tuning condenser with metal plates, but uses slug tuning. Any ideas as to what could cause this?