I do have a copy of the sams I got a while back when I put new caps in it. I know I have a new 4k (r92) I tested the two centering pots. a while ago and they seemed to be in range but I shall check again just in case i messed up
Looking at the data sheet for the 6bq6gt i guess it is supposed to be a negative voltage going to grid 1 the sams just said in the horizontal sweep adjustment directions it should measure 20-28 volts I guess I just assumed it would be positive.