It turns out my width issues were due to 1/2 of a 12SN7 going dead. Absolutely 0 emissions. I figure the cathode must be open.
Next up, I pulled the tuner for an overhaul. Now, I can see that it is a Sarkes Tarkian V5941 made in Indiana. It does not match the service info and the output wire is spliced into the set.
That makes me wonder if it's a replacement?
Maybe at the dealer when they replaced the HV caps?
It could also very well be that the mixer tube really should be a 6AU6 and not as 6AG5 as shown in the tube layout?
I tried looking up that tuner part# but came up empty.
