VT-71 Making me crazy!

[7"estatdef]

On the bench I have a TS-4J chaiss that I can't seem to get the low B+ above 60V. As you can see from the Motorola diagram V4,6,&10 are the tubes that feed the low B+ circuit. With 250v on the plate the cathode is use in a voltage divider to derive 125v for V1 rf amp, V12 audio output, and V10A half of the clipper.

V4,6,&10 have 235-250v on the plates. Have checked all of the 1K resistors the coupling the HV. Replaced C78B filter for 125v buss. Have lifted the cathode resistors on these tube to check voltage all have around 200v. Replaced output tube V12 thinking in might be loading the circuit.Grid voltage is -4 on the V10 with 60v on the plate. All paper caps have been replaced. Filters seem ok C78 was replaced years ago. All ouput voltage of the power supply seem good and replaced E2&3 w/silicone jobs.

V4&6 have 5.7v on the heater V10 13.2v. R43 tested at 7200 ohms should be 6800. All 1k's are within 15% as are the 68 ohm cathode resistors. Control grid to cathode voltages seem normal as there are no high - voltages on the grid.

Throw a bucket of water on my head my hair is smoking!!!!
Tnx for any help
Terry