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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TubeHobby NCV2.1_manual+Schem. 21.pdf
Description: Adobe PDF document
