The Family DuMont

[CaryLee]

Originally Posted by holmesuser01

Your set must be an early version. My RA-113 has a 7 pin miniature tube in that spot.

I've got a couple of used 6AC7 GT's here, according to my lists. Don't know if they are good or not.

According to the SAMS Photofact, production changed bulletin, your set might be earlier than mine. SAMS says: "To accommodate tube availability the video amplifier tube, V9 was changed to a type 6AC7. The tube socket wiring was changed when the 6AC7 tube was used." (I'm no expert, but that last sentence seems kind of obvious...since the tube it replaced was a mini glass tube and the "new" replacement uses an octal base.)

The bulletin doesn't give dates, but serial numbers and some chassis codes. Apparently this change was made on the 112A at #1232254.

The bulletin also seems to indicate that the change was only made on the RA-112A. There's nothing in the SAMS production changes bulletin that says it was ever changed in the RA-113. Don't know why they'd change it "to accommodate tube availability", and not change it across the board.