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I tried to use the set after 2 months of it sitting on the shelf.There is a low hum present with  the volume down and even 1st AF tube out. The radio has been  100% restored  recently. Checked grounds, all seem to be OK.Middle tr-r tap for the 47 tube filament is grounded as well. E-caps do not show any leakage albeit checked with  a regular VOM (still working on my cap. checker). Any other places should I check? Thanks.
P.S. I just read JPH 14 post from 10/05/2014. Does not look relevant to me, as the issue, I believe, is after 1st AF (27) tube. I did try another 47 tube with no improvement. Should I bump up the second E-cap?

http://www.nostalgiaair.org/PagesByModel...013881.pdf