[MrFixr55]

Hi M
ancave,
+1 on what Morzh said. I have done a Gloritone 26. The difference is that mine had a '45 triode as an output as opposed to the '47 that you have. (The P in 26P refers to Pentode output.)

Voltage at the output transformer should be about 250V. Voltage at the cathode of the '80 should be about 325-350V. Power transformer secondary should be 350V between either rectifier plate lead and the center tap, or 700V across the transformer rectifier plate leads (above the ability of most meters to measure, so measure between each plate lead and the center tap.

It is important to note that the center tap of the B Power supply is NOT at chassis potential. Most sets made before about 1939 or so had resistance between the center tap and chassis ground. The chassis was B- / C+. The center tap was now C-. This was done to develop cathode bias for several tubes, particularly the -18V of grid bias required by the output tube.

Hope this helps.