Is anyone familiar with the process to bias the TRL Dude Preamp


I was saddened to learn that Paul Weitzel has passed away earlier this year. I was wondering as I was in the process of replacing tubes in my TRL Dude, it appears there is a potentiometer for what may be biasing
of one of the tubes. Is anyone familiar with this process and can share it here? I am not sure which tube
gets biased either, but it would appear to be one of the three power supply tubes. Thanks in advance.
tellefsen
Sorry for the slow response. I have been on travel. Thanks RX8MAN for the procedure.  Bill, I may still call you to talk through this. Mine has the 1inch face plate. I think it was built in 2010.
335VDC is where mine’s at, there will be a plus-minus 5 volt swing or so during your dial-in, that is normal, the trim pot is sensitive, as long as it’s in that range your good.
Sorry to hear of Paul Weitzel's passing. His equipment was not for the faint of heart (or back!)