Michael,
Those issues are most likely to be caused by poor quality components, rather
than a design flaw. The inductor has a high voltage across it, and the capacitor
handles a large ripple current.
You might want to look into higher-priced parts. Military grade capacitors and
inductors cost less than a single IN-18 tube.
On 9/1/2016 10:51 AM, 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 1^st 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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