Trouble-Shooting my New ST-70 (VTA PCB): Voltages at Pin 5

Hey Guys -

I recently posted a topic about my newly-rebuilt ST070 (with a VTA PCB) giving horrible problems at first startup:

https://dynacotubeaudio.forumotion.com/t3204-another-problem-with-my-st-70-build-rectifier-tube-flashed-and-now-dead-right-rear-tube-any-ideas

Well, acting on the excellent advice of a couple of members here (Thanks again)! I double checked my wiring and found no problems. I then looked through the Curcio trouble shooting guide and did the following:

• Replaced the rectfier with a solid-state one from eBay
  powered up with NO tubes or rectifier: powers up fine.
  Powered up WITH solid-state rectifier: power up fine.
  

I then measured the voltages at pin 5 of the power tube sockets (no power tubes) and got this:

Rear right -43vdc
Front right -42.2vdc
Rear left -43vdc
Front left -43vdc

This seems within spec, right? Doesn't this rule out the quad cap and power trans?

So what now? I don't have any way of testing the power tubes and the Curcio guide suggests power tubes could be at fault. SO.....what would my next step be? All the Dynaco manual test points seem to be WITH tubes: and since I can't trust the power tubes, what to do next??

Thanks!!

As i wrote on audiokarma :
I would start with a new set of el34, and a new GZ34.
Tubes are expendable and once flashed may easily flash again.

But first, double check that the bias resistors ( 10 ohm?) are all healthy, and that the bias
pots are turned fully in the direction of most negative voltage for all 4 power tubes. This is
a starting point when installing new power tubes !
Also power up with shorting plugs on inputs and a proper loading on the output ( speakers or 8 ohm
power resistor)