[fields 100]

Oh one more thing....your transformer may simply buzz. I have this in my 70. There is not much one can do about it short of disassembling, re-shimming, varnishing, clamping the shell (the latter I tried to no avail).

So, you are referring to the mechanical sound being simply heard from the wooden box or the  one being amplified throughout the AF stage?
I tried the other 80, no improvement. However bumping up the first e-cap did decrease the hum I'd say by 35- 40 %.