help designing swithing psu 12v (dc) to 36ov(DC) 30ma for guitarpedal tubeamp

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I'm searching for a schematic or any other assistance in building a small psu
that can convert 12v dc to 360v dc ( 30ma).
This will be used to power up a small guitar preamp with three smal dubbel triodes.
The thing needs to be compact because it will have to fir in a small Hammond box which wil be used as a guitarpedal.🙂

Your help is most appreciated.
 
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