[Amps] Shunt resistors for a bridge made of 6A10 diodes in Alpha 91b

[Steve Ireland]

G’day

I am refurbishing the power supply board in my Alpha 91b and am going to replace the KD202P diodes which make up the bridge with 6A10 diodes (1000V 6A and only A$1.95 each). 

The original bridge had strings of five KD202P a side, with shunt resistors across each diode of 500K 1W. The stud mounted diodes are looking pretty burnt around the retaining washers/bolts, so it is definitely time (and I have a strange earth leakage fault).

Please, I’d really appreciate some advice about what value of shunt resistor to use on each of the twenty 6A10 that will make up the bridge?

PS The replacement encapsulated bridge rectifier sold by Alpha/RKR designs (5kV, 2A) is US$150, so this the reason for looking for a cheaper solution.

Vy 73

Steve, VK6VZ     

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