I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
Would you start by replacing the larger capacitors & try that? Thanks....

:I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
:I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
:Would you start by replacing the larger capacitors & try that? Thanks....
:

What model is the radio?
Generally you have to isolate the particular stage that the noise is generated in and then isolate down to the component or connection level.
The larger electrolytic caps might introduce a hum if defective, not a crackle.

::I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
::I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
::Would you start by replacing the larger capacitors & try that? Thanks....
::
:It could even be a bad tube, I discovered that on a Philco that had a bad #41 amp tube was causing a lot of hum even after all new caps installed.
: What model is the radio?
: Generally you have to isolate the particular stage that the noise is generated in and then isolate down to the component or connection level.
: The larger electrolytic caps might introduce a hum if defective, not a crackle.
:
:

::I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
::I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
::Would you start by replacing the larger capacitors & try that? Thanks....
::
:A radio this old really needs to have all of the coupling caps replaced first. Loud static which you can increase or decrease with the volume control suggests that the audio amp is working. If, by static, you mean loud hum which is not effected by the volume control, then the large electrolytic cap is bad.
Damian

: What model is the radio?
: Generally you have to isolate the particular stage that the noise is generated in and then isolate down to the component or connection level.
: The larger electrolytic caps might introduce a hum if defective, not a crackle.
:
:

:::I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
:::I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
:::Would you start by replacing the larger capacitors & try that? Thanks....
:::
::A radio this old really needs to have all of the coupling caps replaced first. Loud static which you can increase or decrease with the volume control suggests that the audio amp is working. If, by static, you mean loud hum which is not effected by the volume control, then the large electrolytic cap is bad.
:Damian
:
:: What model is the radio?
:: Generally you have to isolate the particular stage that the noise is generated in and then isolate down to the component or connection level.
:: The larger electrolytic caps might introduce a hum if defective, not a crackle.
::
::
:
:
Static level is unaffected by the volume knob...very small change, if any.

:I would like to repair for sentimental reasons. Have Sam's schematic. Can locate/solder & read values.
:I don't know what fails to prevent sound, just static, to come through. What would you check first? I don't know what section of the schematic to go to first.
:Would you start by replacing the larger capacitors & try that? Thanks....
:
THE model was left out for some reason...it's an RCA RHC19B..no tubes.

Try cleaning the AM&FM selector switch with a little spray contact cleaner. Rotate the switch back a forth a bunch of times. A little shot in the volume control. This radio does have electrolytic capacitors both big and small everywhere. Sometimes you get lucky and can see a crud leaking from the bottoms down the leads. That one needs to be replaced. Have a good look with a magnifier.

If the radio had no tubes and when installing replacement tubes, double check to make sure the correct tube is in the correct socket.

Clifton

:Try cleaning the AM&FM selector switch with a little spray contact cleaner. Rotate the switch back a forth a bunch of times. A little shot in the volume control. This radio does have electrolytic capacitors both big and small everywhere. Sometimes you get lucky and can see a crud leaking from the bottoms down the leads. That one needs to be replaced. Have a good look with a magnifier.
: