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The triplers were made either by VARO or EDI. EDI ones held up pretty good - they typically used a polypropylene shell that "gave" a bit when warm. This helped prevent cracking. VARO (light gray, or the ubiquitous Sylvania white) typically failed with cracking or arcing. VARO fixed their problems and outlasted EDI in making triplers. The replacement ones (ECG/SK/GE) were hit and miss, as you could have two same-marking ECG523s, one an early VARO and one a later one. They cleared up things somewhat in adding the "a" suffix to the ECG number. Occasionally the non-"a" triplers appear on eBay - avoid them unless there is a date code of 1980 or later, hard to tell in most photos. The orange drops have differences too - the pulse rated ones (715P and 716P) are made of polypropylene (PP or even MPP) dielectric, and should be the ones used. The polyester ones (225P and 418P, and "PS" series) were for non-pulse coupling and bypass use, and should not be used in pulse applications such as safety caps. The higher voltage 225P and PS series caps were for buffer caps replacement in old car radios using a vibrator supply. Cheers,
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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