I'll open it up and get a pic of it. The actual layout of the radio looks to be the same as that of the 6 volt one;I'm pretty sure I can't get away with just using 12 volt versions of the 6 volt tubes-that'd be TOO easy. I was reluctant to take anything apart until I actually had work to do on it,because my "shop" is such a mess any loose parts tend to disappear.
Speed
BTW-I thought ALL tube radios had a vibrator tube.

1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck