On my L-4B the fan switches off when the power is disconnected (normal), has anyone made a system using the original components to keep the fan running for a few minutes after switch off? I did this with my other linears and it does extend the tube life, trouble is with the L-4B it has a 110v fan that operates through the filament transformer to reduce the 220v to 115v. in order to make it run on you have to have the filaments on which defeats the object a bit and doesn't the psu get hot after a 4 hour contest, I know where I can put my 'Chinese takeaway' next time hihi. ( I have put a fan on that of course), 73 Max
