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A good 600VDC (such as yours) is fine.
"X" rated capacitors, when labelled "250VAC" really mean that they are approved for use on "up to" 250VAC lines, to include 220-230-240VAC ones but not three phase 380VAC. They support over 1500 VDC.
I think Marshall used them there for 2 reasons
1) it's a critical component; its failure burns tubes , diodes and transformers, so it pays to spend a few extra cents and be safe
2) I'm sure Marshall already buys "X" capacitors by the truckload and have a lot of them in stock, so ......... why not use them?
"X" rated capacitors, when labelled "250VAC" really mean that they are approved for use on "up to" 250VAC lines, to include 220-230-240VAC ones but not three phase 380VAC. They support over 1500 VDC.
I think Marshall used them there for 2 reasons
1) it's a critical component; its failure burns tubes , diodes and transformers, so it pays to spend a few extra cents and be safe
2) I'm sure Marshall already buys "X" capacitors by the truckload and have a lot of them in stock, so ......... why not use them?
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