I picked up an Johnson Viking ll transmittter at a hamfest yesteday. I
have the manual for it.

It has been modified in several ways with no docummnetation. One is
there are 2 voltage regulator tubes in series that connect to the large
power resistor with the slider contacts on it. Is there a published
modification for this ?

Another thing is on the 807 tube plates there is an added resistor of
about 25 ohms. It is similar to the paricitic supressor on the plates of
the 6146s but without the wire around it. This is the first time I have
seen resistors this way in audio circuits. I am mainly solid state,but
have worked some with tubes, but have not worked on many audio
amplifiers of any power.
What is the purpose of those two resistors ?