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Had to convert the R101 preamp due to some residual hum which I could not get rid of without changing the transformer topology.. No worries though, plenty of possibilities here. So rebuilt it using some nice tennis ball shaped Psvane 6SN7's. Kinda neat use of a 6AL5 double diode per channel as cathode bias for the 6SN7 whilst operating in SRPP with a line-output transformer. Bandwith from 8hz up to 210Khz.. And no R or C in the signal path, except from the coupling capacitor..