In article , says...

I also found out the 2nd 6au6 tube has been replaced by a 6AQ5 tube and
seems to be rewired to match.

That's also factory. Do you have the correct manual for the thing?
Get the one from:
http://www.radiomanual.info/schemi/S...ing-2_user.pdf
--scott
--



Thanks for the info and manual link. I downloaded it.

It is dated 1953 where the one I have is 1952 and it does show the 22
ohm resistors in the plates of the 807 tubes that is not shown on the
schematics I have.

I have 2 (now 3) schematics that are slightly different. However they
both show a 6AU6 tube as the second one in the audio amp driving the 807
tubes. The Viking 2 I have has a 6AQ5 tube in that place. Maybe it is
factory like you say and I need to look for another schematic. I know
for the short time I have looked on the internet there have been many
mods for the audio stages. The older schematic does not show it,but the
newer ones show a 6AQ5 for the screens of the 6146 tubes.

I know there are many modifications to it. A ham gave me some old QST
and CQ magzines from the late 1940s up to the 1970s. I do remember
seeing a few mods for the Viking 2,but would never be able to find them.
I looked on the internet and it is also full of mods.

I hate it when there is a change and no difference in the model number
or maybe a letter after the change. I worked in industry at calibrating
and repairing instruments among other things. Some companies would make
a change and never show a different model number on the boards. Made
things confusing there also.

73 de ku4pt