Oops said uf!! Doh! On Thursday, September 1, 2016 at 10:51:45 AM UTC-7, MichaelB wrote: > > Had another TubeHobby clock start blowing fuses the other day and I know > others on this forum have had similar issues. I have 4 of these muxed > clocks and 2 that drive IN-18’s, the others use smaller tubes like the > Z566M and the Z574M and have been fine. However, I have had issues now with > both of the IN-18 clocks where the 1st blew C6 (see attached PS > schematic) and now this one has eaten (shorted, or darn near, measures > .3ohms) the 270uf inductor. Replaced it and the clock has run fine now for > 3 days, so its fixed for now. Not sure what it is about this clock's power > supply driving IN-18’s and so wondered if others have noticed this problem > and what a long term cure might be? Included the power supply schematic for > review. >
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