Re: SX-100 Repair Problems - Bumblebees!
¿ªÔÆÌåÓýJacques , I have been trying to find out about the Sprague product line from the 1948, 1949 ??telecaps? ..black beauty? and onto the hcx?? and difilm but it is not so simple. Anyhow I ran into that ad, and what surprised me is that THEY knew how sensitive most caps are to moisture. Presumable you know these are mostly HCX caps their trademark for ??? As usual, more questions than answers. PS, ?thanks for your other stuff. I¡¯m trying to digest it, but cant keep up with you guys. ? From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Friday, March 29, 2024 12:21 AM To: [email protected] Subject: Re: [HallicraftersRadios] SX-100 Repair Problems - Bumblebees! Importance: High ? Thank you for having find this, Don. I have many Sprague 160P in my capacitors bins and they all survived, 60 + years after they were made. My actual limit of leakage detection is 10nA at the WVDC of the tested capacitors. That represent, for ex., a resistance of 60,000 Meg ohms with 600V applied. All modern capacitors (polyester or polypropylene) exhibit that almost inexistant leakage behavior. BUT The graph attached represent the actual MOISTURE resistance under the given test conditions, but does not give any information about the dielectric degradation, measured in years¡ Not sure that the curve ¡°E¡± is applicable to recent manufactured polyester dielectric capacitors, however. I did not read any information, anywhere, saying that they are moisture sensitive. But, this is 1960 advertising, and we do not know what are the other brands of capacitors compared with the DIFILM ones, or their manufactured value. And, above all, I did not think that, in 1960, Sprague engineers were able to predict that their ¡°new¡± 160P capacitors will still be useable 65 years later. ? 73, Jacques, VE2JFE in Montreal ? Here is an interesting Srpague chart from 1960 advertising. Below is just a fragment
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don Root