Emerson 612 Grid bias problem

[Kevin Kuehn]

Originally Posted by old_tv_nut

Agree on possible error in the SAMS.

OK now I do see -8.4 listed on the voltage chart for pin 6(no internal connection) of the 6v6. So -8v seems within tolerance for that audio output tube. So if we assume -8.4 is the negative supply, then that should be divided by the in series 33 and 180 ohm resistors feeding the grid of the first video amp. So the measured -1.4v makes more sense to me than -.2v, unless Sams -.2v measurement was taken with a lot of grid leak action from a very strong signal, but I have my doubts about it changing that much when it has a fixed bias through a 470k at the grid.