[MRCA] [Milsurplus] Capacitor issues

[Peter Gottlieb]

If it's PCB oil it probably isn't flammable but wash your hands before eating. Can you see where it's leaking and repair it?  If you want identical appearance I would cut the bottom side and remove contents and put a replacement cap inside then spot solder the bottom piece back. 


Peter

> On Jun 2, 2016, at 8:57 AM, W2HX <w2hx at w2hx.com> wrote:
> 
> Could you drill a small hole in the bottom of the can, empty out all of the oil and then place a cap in parallel with it under the chassis?
>  
> From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Ray Fantini
> Sent: Thursday, June 02, 2016 8:55 AM
> To: milsurplus; mrca at mailman.qth.net
> Subject: [Milsurplus] Capacitor issues
>  
> So a 1936 USCG R-104 receiver followed me home from Dayton, it’s very clean and in no way modified and the intent is to build an external power supply and case and have it working. One of the problems is that it uses two huge square 4 mfd @400 volt capacitors in its power supply input along with a filter choke and both of the capacitors have leaked a lot of oil out of the can and all over the chassis. In the picture you can see one of the offending capacitors that’s been removed and cleaned up but I don’t want to put it back in being it will just leak more oil over time.  It still checks good with only a small amount of leakage but would not trust it anyway. So the big question is what’s the best way to open this up and remove the guts and substitute the innards with a modern capacitor? It appears that the original can is soldered all around but I would prefer to keep the original external appearance and finish being everything in the radio matches so heating this up with a torch would be issues also don’t know if the oil is flammable. Maybe the answer is cutting around the base of the can but at this point have no idea on how? maybe a dermal tool with a cutting wheel? Is it possible that if the base of the can is heated with a torch that the entire contents can be dropped out? Another option may be to solder up the small hole on the outside of the capacitors can and install it back and keep it original? Have lots of questions but no answers at this point. In the past I would have just replaced the offending parts with modern ones but in this case wanted to keep the receiver looking the same so that’s the source of the dilemma.
>  
> Ray F/KA3EKH
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