Folks,
I was recently mailed a Chronotronix V400 clock to see if I could repair
it. This is a 6 digit clock with bi-quinary B-5025 tubes and a MAX1771
power supply.
It has a blown fuse, and the IRF840 ran hot for a while (the board is
blackened). It and the the HV filter cap were replaced, as the solder
joints are newer. The little L4 inductor next to the IRF840 looks like
its solder joint overheated, as the PC board there is damaged.
The anode resistor on the leftmost digit even anode is also cooked.
Perhaps this tube was bad and overloaded the supply for a while?
Do any of you have experience in working in this clock or similar,
and/or do these symptoms sound familiar?
--
David Forbes, Tucson AZ
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