Dumont RA-109 tubes question

[kramden66]

ah ha riders tv trouble cures vol 1 says to improve sensitivity replace the first and second if 6au6 tubes with 6bc5 tubes , there are other changes but they were not done to this set , so apparently it will function with those two tubes , the other mod is replace 4th if with a 6bc5 and remove the ground connection from pin 2 of the 4th if , the 6au6 is still the 4th in this set , also replace the last if transformer with a different one , so either dumont or someone else decided to put the two 6bc5 tubes in and that was good enough.

mike

[wiseguy]

I have the same set but "a" version, and the tube complement is the same as you say, the Sams must show the Earlier chassis, my tube chart in the Cabinet does show those Tubes you found