Philco 37-610 low volume

3/19/2011 9:11:03 AMDale

Hello, I have recapped a Philco 36-610, originally filter cap hum was bad, and now has no hum at all but volume is not as loud as it should be, output tube was replaced from another radio with same output tube that was working good in and vice versa tube from the 610 works good in the other radio, so not the problem, the only cap not replaced are the 2 in the rf sub chassis ar they are in an incredibly hard to reach an since radio plays very clearly I left them alone, speaker is original and also same as my 38-9 model and swapping them changes nothing and both work relly well in the 38-9.The tubes are all the same as the 38-9 and exchanging them back and forth does no change either, so I am left with either the volume controll has higher resistance or mabe a wrong cap value, the tone controll does change the tone very well on all 3 settings, and I was really carefull with the caps, one at a time and tried radio in between,any ideas what else to look for?

3/19/2011 11:05:11 AMNorm Leal

Hi Dale

Measure plate and screen voltages on tubes. Plate and Screen (grid #2) should be positive.

Peak up IF Transformers. Each will have two adjusting screws.

I wouldn't expect a problem with the volume control. It's just a divider between signal and ground.

Norm

:Hello, I have recapped a Philco 36-610, originally filter cap hum was bad, and now has no hum at all but volume is not as loud as it should be, output tube was replaced from another radio with same output tube that was working good in and vice versa tube from the 610 works good in the other radio, so not the problem, the only cap not replaced are the 2 in the rf sub chassis ar they are in an incredibly hard to reach an since radio plays very clearly I left them alone, speaker is original and also same as my 38-9 model and swapping them changes nothing and both work relly well in the 38-9.The tubes are all the same as the 38-9 and exchanging them back and forth does no change either, so I am left with either the volume controll has higher resistance or mabe a wrong cap value, the tone controll does change the tone very well on all 3 settings, and I was really carefull with the caps, one at a time and tried radio in between,any ideas what else to look for?
:

3/19/2011 3:57:54 PMGary

Dale

Had a similar problem! Ckeck around the volume control circuit and right at the out put of the detector tube. I had several hundred millivolts at the bottom of the coil driving the detector tube. However I had nearly nothing at the top of the volume control. Checked around with the ohm meter and found a 21 ohm reading on the volume control wiper! Finaly I removed the volume control leads and the problem was gone. Reconnected and had great volume. Must have been a "wisker" short on the volume control. But any bad capacitor or resistor in that citcuit could kill the audio signal at the volume control!

Gary

:Hi Dale
:
: Measure plate and screen voltages on tubes. Plate and Screen (grid #2) should be positive.
:
: Peak up IF Transformers. Each will have two adjusting screws.
:
: I wouldn't expect a problem with the volume control. It's just a divider between signal and ground.
:
:Norm
:
::Hello, I have recapped a Philco 36-610, originally filter cap hum was bad, and now has no hum at all but volume is not as loud as it should be, output tube was replaced from another radio with same output tube that was working good in and vice versa tube from the 610 works good in the other radio, so not the problem, the only cap not replaced are the 2 in the rf sub chassis ar they are in an incredibly hard to reach an since radio plays very clearly I left them alone, speaker is original and also same as my 38-9 model and swapping them changes nothing and both work relly well in the 38-9.The tubes are all the same as the 38-9 and exchanging them back and forth does no change either, so I am left with either the volume controll has higher resistance or mabe a wrong cap value, the tone controll does change the tone very well on all 3 settings, and I was really carefull with the caps, one at a time and tried radio in between,any ideas what else to look for?
::
:
:

3/20/2011 8:35:12 AMWalter

On mine, I had an intermittant low volume and found that the rubber mounts for the RF subchassis had settled and was grounding out the signal on the main chassis. Moving the subchassis slightly restored volume.

:Dale
:
:Had a similar problem! Ckeck around the volume control circuit and right at the out put of the detector tube. I had several hundred millivolts at the bottom of the coil driving the detector tube. However I had nearly nothing at the top of the volume control. Checked around with the ohm meter and found a 21 ohm reading on the volume control wiper! Finaly I removed the volume control leads and the problem was gone. Reconnected and had great volume. Must have been a "wisker" short on the volume control. But any bad capacitor or resistor in that citcuit could kill the audio signal at the volume control!
:
:Gary
:
::Hi Dale
::
:: Measure plate and screen voltages on tubes. Plate and Screen (grid #2) should be positive.
::
:: Peak up IF Transformers. Each will have two adjusting screws.
::
:: I wouldn't expect a problem with the volume control. It's just a divider between signal and ground.
::
::Norm
::
:::Hello, I have recapped a Philco 36-610, originally filter cap hum was bad, and now has no hum at all but volume is not as loud as it should be, output tube was replaced from another radio with same output tube that was working good in and vice versa tube from the 610 works good in the other radio, so not the problem, the only cap not replaced are the 2 in the rf sub chassis ar they are in an incredibly hard to reach an since radio plays very clearly I left them alone, speaker is original and also same as my 38-9 model and swapping them changes nothing and both work relly well in the 38-9.The tubes are all the same as the 38-9 and exchanging them back and forth does no change either, so I am left with either the volume controll has higher resistance or mabe a wrong cap value, the tone controll does change the tone very well on all 3 settings, and I was really carefull with the caps, one at a time and tried radio in between,any ideas what else to look for?
:::
::
::
:
:

3/22/2011 7:18:38 PMDale

: On mine, I had an intermittant low volume and found that the rubber mounts for the RF subchassis had settled and was grounding out the signal on the main chassis. Moving the subchassis slightly restored volume.
:
::Dale
::
::Had a similar problem! Ckeck around the volume control circuit and right at the out put of the detector tube. I had several hundred millivolts at the bottom of the coil driving the detector tube. However I had nearly nothing at the top of the volume control. Checked around with the ohm meter and found a 21 ohm reading on the volume control wiper! Finaly I removed the volume control leads and the problem was gone. Reconnected and had great volume. Must have been a "wisker" short on the volume control. But any bad capacitor or resistor in that citcuit could kill the audio signal at the volume control!
::
::Gary
::
:::Hi Dale
:::
::: Measure plate and screen voltages on tubes. Plate and Screen (grid #2) should be positive.
:::
::: Peak up IF Transformers. Each will have two adjusting screws.
:::
::: I wouldn't expect a problem with the volume control. It's just a divider between signal and ground.
:::
:::Norm
:::
::::Hello, I have recapped a Philco 36-610, originally filter cap hum was bad, and now has no hum at all but volume is not as loud as it should be, output tube was replaced from another radio with same output tube that was working good in and vice versa tube from the 610 works good in the other radio, so not the problem, the only cap not replaced are the 2 in the rf sub chassis ar they are in an incredibly hard to reach an since radio plays very clearly I left them alone, speaker is original and also same as my 38-9 model and swapping them changes nothing and both work relly well in the 38-9.The tubes are all the same as the 38-9 and exchanging them back and forth does no change either, so I am left with either the volume controll has higher resistance or mabe a wrong cap value, the tone controll does change the tone very well on all 3 settings, and I was really carefull with the caps, one at a time and tried radio in between,any ideas what else to look for?
::::
:::
:::
::
::
:
:
Thanx Guys, You have given me lots to work with, I will let You know what I find.