that is a BEAUTIFUL radio. . ..
looks like the old owner just used an adapter socket for the 80 --> 5U4
keep your eyes peeled . . . I've scored a NUMBER of beat to hell late 20's and early 30's consoles for short money (under $30) that coughed up some yummy globe 80's and 45's . . . it'd be cool to return it to 'stock'
To be totally honest though, I doubt you'd notice the difference in that circuit . . . just bring it up slow on a variac and enjoy !
I've never seen a Atwater chassis that clean before . .. cabinet looks to be refinished, (color's off) but it sure looks slick . . .
WAY TO GO
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Main system: DIY KLH OB Line Arrays & Altec stuffed Karlson 15's, DOD active Xover; tubes on arrays, SS on Karlsons