B+ rectifiers almost always DEAD SHORT
B+ 375 vs 385 not a problem. Only 3% difference.
Boost low probably due to low HV. Boost is added ON TOP of the high B+.
Comes from FBT pulse then filtered & sometimes rectified.
Boost feeds the CRT G-2 controls & often the Vert & Audio.
If you pull the plate cap OFF the HV rect tube you should be able to draw a nice
1" arc into the air. If you can things are probably good to there.
Pay attn to the hoz out voltages. The G-1 HAS to be very negative per
the manual.
73 Zeno
LFOD !