I have a radio that has 2 metal can electrolytic capacitors mounted on top of the board. Each on has the following symbols on them:

half moon symbol 50mfd
square symbol 50 mfd
triangle symbol 25 mfd
minus symbol 25 mfd

when replacing these, how would I wire them. I know that usually the can is used as the negative ground, but one of the 25 mfd caps has the negative symbol next to it.

Steven

:A good place to start would be the schematic. Find the brand and model number then search for it under resources on this site. If the can is grounded to the chassis it is probably common ground. If it is insulated from the chassis it might be a floating ground and sometimes the can is common positive as in early 60's hi fi amps. hope this is a good start.

I have a radio that has 2 metal can electrolytic capacitors mounted on top of the board. Each on has the following symbols on them:
:
:half moon symbol 50mfd
:square symbol 50 mfd
:triangle symbol 25 mfd
:minus symbol 25 mfd
:
:when replacing these, how would I wire them. I know that usually the can is used as the negative ground, but one of the 25 mfd caps has the negative symbol next to it.
:
:Steven

Jim,

Are you sure that is a "minus" symbol or is it just another geometric shape such as a rectangle to differentiate a fourth electrolytic connection in the can?

Disconnect all of the leads to the can and wire your new electrolytics (observing correct polarity) to the leads that were formerly connected to the can. Do these one at a time to avoid confusion. Leave the can onboard the chassis. It would just be for show at this point and tuck the new electrolytics under the chassis and out of view. You could still use the ground lug on the can as a common ground point if you wanted to. Some guys will restuff an old can with the new electrolytics but I'll leave that discussion for someone else.

Randy

::A good place to start would be the schematic. Find the brand and model number then search for it under resources on this site. If the can is grounded to the chassis it is probably common ground. If it is insulated from the chassis it might be a floating ground and sometimes the can is common positive as in early 60's hi fi amps. hope this is a good start.
:
:
:
:I have a radio that has 2 metal can electrolytic capacitors mounted on top of the board. Each on has the following symbols on them:
::
::half moon symbol 50mfd
::square symbol 50 mfd
::triangle symbol 25 mfd
::minus symbol 25 mfd
::
::when replacing these, how would I wire them. I know that usually the can is used as the negative ground, but one of the 25 mfd caps has the negative symbol next to it.
::
::Steven

It is a minus symbol.
Steven

:Jim,
:
:Are you sure that is a "minus" symbol or is it just another geometric shape such as a rectangle to differentiate a fourth electrolytic connection in the can?
:
:Disconnect all of the leads to the can and wire your new electrolytics (observing correct polarity) to the leads that were formerly connected to the can. Do these one at a time to avoid confusion. Leave the can onboard the chassis. It would just be for show at this point and tuck the new electrolytics under the chassis and out of view. You could still use the ground lug on the can as a common ground point if you wanted to. Some guys will restuff an old can with the new electrolytics but I'll leave that discussion for someone else.
:
:Randy
:
:
:::A good place to start would be the schematic. Find the brand and model number then search for it under resources on this site. If the can is grounded to the chassis it is probably common ground. If it is insulated from the chassis it might be a floating ground and sometimes the can is common positive as in early 60's hi fi amps. hope this is a good start.
::
::
::
::I have a radio that has 2 metal can electrolytic capacitors mounted on top of the board. Each on has the following symbols on them:
:::
:::half moon symbol 50mfd
:::square symbol 50 mfd
:::triangle symbol 25 mfd
:::minus symbol 25 mfd
:::
:::when replacing these, how would I wire them. I know that usually the can is used as the negative ground, but one of the 25 mfd caps has the negative symbol next to it.
:::
:::Steven

Steven in your case that's just another symbol for a value, the 25MFD. And it may not be indicated on the bottom next to the terminal as the others are. It will be the one remaining. The can will also state what is negative. Such as "can negative." Here's the rub. The can may indicate negative on the can and show the minus symbol. Then that terminal on the bottom will have the minus symbol next to it. That terminal is also called the common negative, depends on mfr. The can itself may just be chassis ground. It could be worked either way. You need to determine the type of ground by the schematic. You may have room to use a terminal strip for all or install the new caps closer to where positive leads go. Makes a better look than dangling from a cut lead. Just make sure you don't use the old terminals. You didn't say the model or age of your radio. But it may not be necessary to replace all sections of your caps unless they are bad.

:It is a minus symbol.
:Steven
:
:
:
::Jim,
::
::Are you sure that is a "minus" symbol or is it just another geometric shape such as a rectangle to differentiate a fourth electrolytic connection in the can?
::
::Disconnect all of the leads to the can and wire your new electrolytics (observing correct polarity) to the leads that were formerly connected to the can. Do these one at a time to avoid confusion. Leave the can onboard the chassis. It would just be for show at this point and tuck the new electrolytics under the chassis and out of view. You could still use the ground lug on the can as a common ground point if you wanted to. Some guys will restuff an old can with the new electrolytics but I'll leave that discussion for someone else.
::
::Randy
::
::
::::A good place to start would be the schematic. Find the brand and model number then search for it under resources on this site. If the can is grounded to the chassis it is probably common ground. If it is insulated from the chassis it might be a floating ground and sometimes the can is common positive as in early 60's hi fi amps. hope this is a good start.
:::
:::
:::
:::I have a radio that has 2 metal can electrolytic capacitors mounted on top of the board. Each on has the following symbols on them:
::::
::::half moon symbol 50mfd
::::square symbol 50 mfd
::::triangle symbol 25 mfd
::::minus symbol 25 mfd
::::
::::when replacing these, how would I wire them. I know that usually the can is used as the negative ground, but one of the 25 mfd caps has the negative symbol next to it.
::::
::::Steven