[1100 man]

Hi Andy,
After seeing this method discussed by HCS & Fernseh on this forum, I have used it on two transformers, neither of which had seen power for probably 40 years! I wanted to try and prevent any problems before powering them.

I left them cooking for about three days I think, running at just slightly hotter than 'mildly warm'. I did the primary winding as well as the EHT overwind. I used a variable power supply and Avo to monitor the current as you describe.
Certainly one LOPT had been stored in very wet (way beyond damp!) conditions.
After the treatment, both transformers worked fine. Of course, I don't know if they would have worked anyway, but it seemed a very good idea to dry them out first. I will do the same for future projects.

Have you changed capacitors around the line stage? Particularly the boost cap?
I don't have the circuit to hand, so can't tell you which one that is. Maybe someone could post the relevant part of the circuit?

All the best
Nick