Philco 77

[7"estatdef]

You seem to be missing the large tube shield. This very well might be the cause of your issues. Also be advised that the input filter cap (inside the box from connections 2 to 6) should be a non polarized mylar 2mfd/630v. If you use an electrolytic cap it will short after a while do to the high ripple current at that point in the p/s.
Depending the style of the cabinet the original speaker would have looked like this one. https://www.ebay.com/itm/vintage-PHI...gji:rk:22:pf:0
GL
Terry