Quote:
Originally Posted by JBL_1
Looks to me like there is one newer yellow electrolytic soldered under the chassis.
I'm a big fan of getting rid of all the leaky paper caps. But I have also had very good
luck with electrolyics in cans from the pre-wars up thru the mid 50's. I just reform them with a very low charge current and they are not leaky. It is not like they are in a place to cause a lot of damage when they short. My TRK-120 has all of it's original electrolytics and it works fine.. I thought Harry told me he got it from a picker from the Lancaster area.. I'll have to go back and check my emails.
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I am glad to see someone else saving the early dry electrolytics. I reform them as well and have little problem with them.
I have also had good luck with early-mid 1930's wet electrolytics. If the electrolyte has not leaked (due to perished rubber seals) I have been able to reform and use these as well. My old Scott radio has a wet electroytic from1935 and it maintains the 20ufd with vitually no leakage. The reforming took about four days incrementally increasing the voltage across the wet electrolytic until the full rated voltage was reached. As the capacitor reforms, the leakage current drops and the wet electolytic leakage remains constant at about 50uA at full voltage.
The post WWII dry electrolytics reform pretty fast but I still give each a couple of days to ensure the leakage is below 100uA and remains there.
Terry