I just got a Silvertone 7241. I need to replace the electrolytics. The parts list inside the cabinet identifies the input cap (C23) as an 8 mfd / 250 volt cap. That's no problem. However, the B+ cap (C22) is identified as a "Condensor, Wet Electrolytic, 225 volt, Regulating." There is no mfd value. Between them is a 3000 ohm speaker field that drops the voltage from 255 volts at C23 to 160 volts at C22.

I was wondering, does C22 a) have a variable mfd value to regulate for AC line frequency, b) somehow regulate the B+ voltage at 160 volts, or c) both a and b? (Or is there some other function that I'm not considering?)

Does anybody have suggestions on replacing this cap?

By the way, this radio was made by Detrola.

Hi Steven

Use 10 mfd @ 450 volt replacements. They will be small in size and can be connected under the chassis without removing the originals. Be sure to disconnect the originals.

Values of electrolytic filter caps aren't critical. Larger values will filter out hum better. Years ago larger values were expensive.

Norm

:I just got a Silvertone 7241. I need to replace the electrolytics. The parts list inside the cabinet identifies the input cap (C23) as an 8 mfd / 250 volt cap. That's no problem. However, the B+ cap (C22) is identified as a "Condensor, Wet Electrolytic, 225 volt, Regulating." There is no mfd value. Between them is a 3000 ohm speaker field that drops the voltage from 255 volts at C23 to 160 volts at C22.
:
:I was wondering, does C22 a) have a variable mfd value to regulate for AC line frequency, b) somehow regulate the B+ voltage at 160 volts, or c) both a and b? (Or is there some other function that I'm not considering?)
:
:Does anybody have suggestions on replacing this cap?
:
:By the way, this radio was made by Detrola.

Hi Norm

Thanks. However, I'm still curious why Sears/Detrola made this cap sound special. Any opinions?

:Hi Steven
:
: Use 10 mfd @ 450 volt replacements. They will be small in size and can be connected under the chassis without removing the originals. Be sure to disconnect the originals.
:
: Values of electrolytic filter caps aren't critical. Larger values will filter out hum better. Years ago larger values were expensive.
:
:Norm
:
::I just got a Silvertone 7241. I need to replace the electrolytics. The parts list inside the cabinet identifies the input cap (C23) as an 8 mfd / 250 volt cap. That's no problem. However, the B+ cap (C22) is identified as a "Condensor, Wet Electrolytic, 225 volt, Regulating." There is no mfd value. Between them is a 3000 ohm speaker field that drops the voltage from 255 volts at C23 to 160 volts at C22.
::
::I was wondering, does C22 a) have a variable mfd value to regulate for AC line frequency, b) somehow regulate the B+ voltage at 160 volts, or c) both a and b? (Or is there some other function that I'm not considering?)
::
::Does anybody have suggestions on replacing this cap?
::
::By the way, this radio was made by Detrola.

Hi Steven

Electrolytic caps can be used with chokes & help tune out hum.. Wet electrolytics would have been new at the time your radio was built. It's not a variable value. Like anything else, companies like to brag when they have something new. Just use 10 mfd @ 450 volts. They cost less now than 60-70 years ago.

Norm

:Hi Norm
:
:Thanks. However, I'm still curious why Sears/Detrola made this cap sound special. Any opinions?
:
::Hi Steven
::
:: Use 10 mfd @ 450 volt replacements. They will be small in size and can be connected under the chassis without removing the originals. Be sure to disconnect the originals.
::
:: Values of electrolytic filter caps aren't critical. Larger values will filter out hum better. Years ago larger values were expensive.
::
::Norm
::
:::I just got a Silvertone 7241. I need to replace the electrolytics. The parts list inside the cabinet identifies the input cap (C23) as an 8 mfd / 250 volt cap. That's no problem. However, the B+ cap (C22) is identified as a "Condensor, Wet Electrolytic, 225 volt, Regulating." There is no mfd value. Between them is a 3000 ohm speaker field that drops the voltage from 255 volts at C23 to 160 volts at C22.
:::
:::I was wondering, does C22 a) have a variable mfd value to regulate for AC line frequency, b) somehow regulate the B+ voltage at 160 volts, or c) both a and b? (Or is there some other function that I'm not considering?)
:::
:::Does anybody have suggestions on replacing this cap?
:::
:::By the way, this radio was made by Detrola.

Yeah, Norm, I'm sure you're right. It's probably along the lines of "New and Improved."

Thanks again.

:Hi Steven
:
: Electrolytic caps can be used with chokes & help tune out hum.. Wet electrolytics would have been new at the time your radio was built. It's not a variable value. Like anything else, companies like to brag when they have something new. Just use 10 mfd @ 450 volts. They cost less now than 60-70 years ago.
:
:Norm
:
:
::Hi Norm
::
::Thanks. However, I'm still curious why Sears/Detrola made this cap sound special. Any opinions?
::
:::Hi Steven
:::
::: Use 10 mfd @ 450 volt replacements. They will be small in size and can be connected under the chassis without removing the originals. Be sure to disconnect the originals.
:::
::: Values of electrolytic filter caps aren't critical. Larger values will filter out hum better. Years ago larger values were expensive.
:::
:::Norm
:::
::::I just got a Silvertone 7241. I need to replace the electrolytics. The parts list inside the cabinet identifies the input cap (C23) as an 8 mfd / 250 volt cap. That's no problem. However, the B+ cap (C22) is identified as a "Condensor, Wet Electrolytic, 225 volt, Regulating." There is no mfd value. Between them is a 3000 ohm speaker field that drops the voltage from 255 volts at C23 to 160 volts at C22.
::::
::::I was wondering, does C22 a) have a variable mfd value to regulate for AC line frequency, b) somehow regulate the B+ voltage at 160 volts, or c) both a and b? (Or is there some other function that I'm not considering?)
::::
::::Does anybody have suggestions on replacing this cap?
::::
::::By the way, this radio was made by Detrola.