I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.

What size replacement filter caps did you use? I would try increasing the cap after the choke from 8uF to 16uF.

Yes, I increased from 10 to 30 and then 40. When it was just 10ufd there was 9.0 volts AC, now at 40 there is 2.0 volts AC.

:What size replacement filter caps did you use? I would try increasing the cap after the choke from 8uF to 16uF.
:

Hi John,
It sounds to me that something in your radio is taking more current than it should. If it is drawing more current, the filters are being depleated more than they should be over a power cycle. That will cause hum.
Since the power output gets the lion's share of the current, you may want to see if something is a miss there.

Best Regards,

Bill

:I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.
:

Thanks Ed M
I tried the ground and no difference but will try the .1 cap. Thanks

::I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.
::
:
:Make sure the radio has a good ground, or connect a .1 mfd 400v capacitor between one side of the 120 volt line and the chassis. Ed M
:

:Thanks Ed M
:I tried the ground and no difference but will try the .1 cap. Thanks
:
I looked this one up, as I have a Gloritone 26 and a 26P that I love dearly. Does the Model 27 have individual wire connectors to the speaker? I think so, and the speaker field coil wires are green. Try reversing these field coil wires. Also try reversing the wires to the output transformer. Also I have seen other sets where the '27 detector tube would introduce hum to a set, even if it tests 'good' on a tube tester. Try another '27 tube. The Gloritone Model 27 has the volume control in the antenna circuit, so hum can get into the audio stages anywhere in the detector or audio stages. Hopefully all shields are in place, and the wiring has not been disturbed. Wire placement may be somewhat critical, and hopefully the filter choke and interstage audio transformer are original. (If not, I will make other suggestions.) I have never seen a '45 tube introduce hum into an otherwise working set, but I suppose it could happen. Literature says a bad interstage transformer can introduce hum, but I have never seen it happen in an otherwise working set. Good luck, and I don't know what else to suggest. Ed M

:::I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.
:::
::
::Make sure the radio has a good ground, or connect a .1 mfd 400v capacitor between one side of the 120 volt line and the chassis. Ed M
::
:

Hi Ed M,
well I tried the .1 across the input line and no luck. I also, pulled the 27 and the hum is still there. Will try reversing the green wires to the speaker like you said. Let you know what happens.

::Thanks Ed M
::I tried the ground and no difference but will try the .1 cap. Thanks
::
:I looked this one up, as I have a Gloritone 26 and a 26P that I love dearly. Does the Model 27 have individual wire connectors to the speaker? I think so, and the speaker field coil wires are green. Try reversing these field coil wires. Also try reversing the wires to the output transformer. Also I have seen other sets where the '27 detector tube would introduce hum to a set, even if it tests 'good' on a tube tester. Try another '27 tube. The Gloritone Model 27 has the volume control in the antenna circuit, so hum can get into the audio stages anywhere in the detector or audio stages. Hopefully all shields are in place, and the wiring has not been disturbed. Wire placement may be somewhat critical, and hopefully the filter choke and interstage audio transformer are original. (If not, I will make other suggestions.) I have never seen a '45 tube introduce hum into an otherwise working set, but I suppose it could happen. Literature says a bad interstage transformer can introduce hum, but I have never seen it happen in an otherwise working set. Good luck, and I don't know what else to suggest. Ed M
:
::::I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.
::::
:::
:::Make sure the radio has a good ground, or connect a .1 mfd 400v capacitor between one side of the 120 volt line and the chassis. Ed M
:::
::
:

I just tried reversing the green wires to the speaker and the hum is about 50% less. Not gone but a lot less this way. Thanks

::Thanks Ed M
::I tried the ground and no difference but will try the .1 cap. Thanks
::
:I looked this one up, as I have a Gloritone 26 and a 26P that I love dearly. Does the Model 27 have individual wire connectors to the speaker? I think so, and the speaker field coil wires are green. Try reversing these field coil wires. Also try reversing the wires to the output transformer. Also I have seen other sets where the '27 detector tube would introduce hum to a set, even if it tests 'good' on a tube tester. Try another '27 tube. The Gloritone Model 27 has the volume control in the antenna circuit, so hum can get into the audio stages anywhere in the detector or audio stages. Hopefully all shields are in place, and the wiring has not been disturbed. Wire placement may be somewhat critical, and hopefully the filter choke and interstage audio transformer are original. (If not, I will make other suggestions.) I have never seen a '45 tube introduce hum into an otherwise working set, but I suppose it could happen. Literature says a bad interstage transformer can introduce hum, but I have never seen it happen in an otherwise working set. Good luck, and I don't know what else to suggest. Ed M
:
::::I have a Gloritone 27 that still hums after changing the filters. I also found one section of the big ballast resistor open and jumped in a 10K. The set works OK now but still has some hum. I show only about 2.0 volts of AC hum out of the power supply. Any ideas on what is causing the hum? The hum is not real loud but is noticeable when off stations.
::::
:::
:::Make sure the radio has a good ground, or connect a .1 mfd 400v capacitor between one side of the 120 volt line and the chassis. Ed M
:::
::
: