Good.I know it for sure has voltage at both pins when the bias board is disconnected.
It is a scrap piece of countertop laminate. I normally use it as a backing material in the chassis of builds to keep the wires/boards from shorting to the chassis. Maybe I should reuse some of the original organ board to replicate the bias circuit?Ok, this might sound bonkers, but is it possible the board you used for the bias circuit is conductive? I have never seen one that looks like that before, but there's a lot I haven't seen... What material is that?
It is a scrap piece of countertop laminate. I normally use it as a backing material in the chassis of builds to keep the wires/boards from shorting to the chassis. Maybe I should reuse some of the original organ board to replicate the bias circuit?
Yes I can clean that connection and check resistance this evening.Hmmm... I'm not sure.
I guess I would unsolder the bias circuit from the rectifier and then go around the board with an ohmmeter and see if there is a short somewhere. You seem to have a lot of excess solder on pin 6--do you have a solder-sucker to clean some of that up? While you have it disconnected, check the resistance of pin 6 to chassis and verify it comes up to match pin 4.
There is a simple wire (blue) from the rectifier to the board. It looks intact, so the short has to be right there at the rectifier socket pin 6, or right on the board before the 220K resistor.
Ok gang updates from the bench side. Per cleaning up that pin 6 per @andrewRneumann I found a small solder bridge from that pin to the old ground ring at the base of these sockets. Doh! Lesson learned. Go into troubleshooting with a magnifying glass and bright light! After cleaning up the bridge and pin, we now have a passing score per the LBL test! Now as a side note, where I was once getting ~350 v at pin 4 and nothing at pin 6, now I am at 378 on my pins 4 and 6. The original schematic shows the final output being ~ 325 to 330 volts. I am hoping that as I add more tubes, that voltage will come down.
I have negative voltage on pin 5 of one tube and no negative voltage on the other sockets pin 5.