I am hoping someone can help... I have recently gotten an RCA 9K3, which has been in the family for many decades, and am trying to get it to work. I have looked at the schematic on here by Rider, and after replacing one tube, realize there is another problem. Based on Rider's schematic and parts section from the manual it is part # C47, stock # 12467, described as a "Capacitor - 30 Mfd." My conclusion is that when turned on, it began steaming and smoking, and when the chassis was sen on the back side, it leaked fluid out of it. I have never done anything like this, and don't know exactly what that means. I was able to unscrew it from the chassis, and now have a black, yellow, brown, and black/brown wires solidered together in different spots, just as the schematic shows. It is my understanding this is a 'wet' or electrolitic capacitor, which i can replace from underneath.

My biggest problem is: what do I replace it with? Other 'paper wrapped' capacitors on this unit have many more numbers, but this unit seems to have no other indication as to what I need to buy and replace it with. IF ANYONE CAN HELP ME OUT WITH WHAT A 'NEW' REPLACEMENT WOULD BE, AND EXACTLY HOW I ATTACH THE WIRES, ETC. I WOULD TRULY APPRECIATE IT!!!
Any light that can be shed on my issue would be a help. I believe everything else is in great working order (so far) and I just refinished the cabined, so I'm egar to fix and get it up and running!!

Thank you for any help!!
-Tim

:I am hoping someone can help... I have recently gotten an RCA 9K3, which has been in the family for many decades, and am trying to get it to work. I have looked at the schematic on here by Rider, and after replacing one tube, realize there is another problem. Based on Rider's schematic and parts section from the manual it is part # C47, stock # 12467, described as a "Capacitor - 30 Mfd." My conclusion is that when turned on, it began steaming and smoking, and when the chassis was sen on the back side, it leaked fluid out of it. I have never done anything like this, and don't know exactly what that means. I was able to unscrew it from the chassis, and now have a black, yellow, brown, and black/brown wires solidered together in different spots, just as the schematic shows. It is my understanding this is a 'wet' or electrolitic capacitor, which i can replace from underneath.
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:My biggest problem is: what do I replace it with? Other 'paper wrapped' capacitors on this unit have many more numbers, but this unit seems to have no other indication as to what I need to buy and replace it with. IF ANYONE CAN HELP ME OUT WITH WHAT A 'NEW' REPLACEMENT WOULD BE, AND EXACTLY HOW I ATTACH THE WIRES, ETC. I WOULD TRULY APPRECIATE IT!!!
:Any light that can be shed on my issue would be a help. I believe everything else is in great working order (so far) and I just refinished the cabined, so I'm egar to fix and get it up and running!!
:
:Thank you for any help!!
:-Tim
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It seems to me that you have a shorted filter capacitor, which in not unusual for an old radio. To replace it, remember this: you HAVE TO connect plus to plus and negative to negative. I don't see any great big hairy real problem. There are lots of places you can get a replacemennt capacitor. Just go with the internet,
Lewis

You are describing a multiple section filter capacitor. Inside there are separate capacitors, that share the same common negative wire. (black wire) What you do is buy individual capacitors the same MFD value and voltage shown on the schematic. Connect all the negative leads together, that would then be the negative lead like the old capacitor was.(Black wire) Connect each positive end of the new capacitors as shown in the schematic with respect to the MFD value and voltage. That's it.

Edd,

I believe it is most likely that the electrolytics are of the 'wet' type similar to the types used in the RCA 10K. He mentioned that liquid ran out of the cap when the chassis was placed on its back. He may have to deal with them and the possibility of their leaking in the future causing problems

Radiodoc
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: : : : : : :Sir Tim. . . . . : : : : : :Looks like you have just met the world of canned dry electroltytics, and at least one of them has oozed out its electrolyte and made you aware of it. : : :And you unit is having THREE separate units, with different treatments of the negative leads. : : :Note the supplemental blow up of the sets power supply and the three electrolytics in that section that ALL deserve replacement. : : : :I have highlighted the polarities of them and DO NOTE that only one of the three end up with a negative terminal going directly to chassis ground. That would be the C46 unit, with its negative terminal wiring treatment in [AQUA] highlighting. : : :The other two end up going to the buss that connects to the center tap of the high voltage winding of the power transformer, :as per the [YELLOW] highlighting. : : :You will need Two 30 ufd @ 450 Vdc units, along with one 16 ufd @ 450 Vdc unit. : : : : : :RCA Power Supply Schema Blowup: : : : : : : : :73's de Edd : : : :

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::You are describing a multiple section filter capacitor. Inside there are separate capacitors, that share the same common negative wire. (black wire) What you do is buy individual capacitors the same MFD value and voltage shown on the schematic. Connect all the negative leads together, that would then be the negative lead like the old capacitor was.(Black wire) Connect each positive end of the new capacitors as shown in the schematic with respect to the MFD value and voltage. That's it.
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Considering that they unscrew, it wouldn't be difficult to unscrew them and drill a small hole for the liquid to flow out. Then put them back in place so that the hole is concealed. Sometimes these also have a rubber plug that can be pulled so that the fluid will drain out.

If these units never leaked before, it is possible that they could have been reformed, and that they weren't shorted, but were drawing excessive current due to their being deformed. However, at this point that is water under the bridge, and they should only be saved for aesthetics.

T.

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: : : : : : :Sir Tim. . . . . : : : : : :Looks like you have just met the world of canned dry electroltytics, and at least one of them has oozed out its electrolyte and made you aware of it. : : :And you unit is having THREE separate units, with different treatments of the negative leads. : : :Note the supplemental blow up of the sets power supply and the three electrolytics in that section that ALL deserve replacement. : : : :I have highlighted the polarities of them and DO NOTE that only one of the three end up with a negative terminal going directly to chassis ground. That would be the C46 unit, with its negative terminal wiring treatment in [AQUA] highlighting. : : :The other two end up going to the buss that connects to the center tap of the high voltage winding of the power transformer, :as per the [YELLOW] highlighting. : : :You will need Two 30 ufd @ 450 Vdc units, along with one 16 ufd @ 450 Vdc unit. : : : : : :RCA Power Supply Schema Blowup: : : : : : : : :73's de Edd : : : :

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::You are describing a multiple section filter capacitor. Inside there are separate capacitors, that share the same common negative wire. (black wire) What you do is buy individual capacitors the same MFD value and voltage shown on the schematic. Connect all the negative leads together, that would then be the negative lead like the old capacitor was.(Black wire) Connect each positive end of the new capacitors as shown in the schematic with respect to the MFD value and voltage. That's it.
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Thank you so much for your time and input!!

-Tim

Tim, did you get the capacitors replaced?