Hi,
A newbie here, I see that this forum concerns a clone of the Mullard 5-20.
I've recently started to resurrect an original, that appears to be a homebrew dating from the late 50's.
I thought you may enjoy seeing some 'before' pictures. I have since replaced various components and changed a few things back to original spec, and can report that it now performing very well,
Cheers Clanger