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RE: Circlotron with MOSFET output

You need Step Down interstage trans. for sure , not any Step Up trans. ! ,since the lateral power Fet`s works with max.AC voltage gate sving around 12-14 V , so the step down trans. have to be in range from 1:4+4 to 1:10+10 , that step down conversion ratio directly depends from chosen input/driver SET tube & SET Amp/driver configuration .
So any enough linear DHT triode which can produce around 1 W of output can easy drive up to 5 pair of lateral MosFet`s conected in Circlotron power bridge .
BTW , the quality of this small interstage trans. have Crucial impact to final Amp sound .

Best Regards !

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