06-28-2014, 06:30 AM
I had a 47B for a while that had been converted to AC operation. Someone added a power transformer in place of the large condenser can, and an 80 tube in the ballast tube socket. It ended up being sort of like a 91 circuit in a 71 chassis.
Why not find and restore a 71 chassis and K-7 speaker (assuming it is a cathedral) instead if you want to be able to plug it in the wall? Restoring a 71 would be less hassle. You could then sell the 47 chassis and speaker to someone who would prefer to keep it original. (You will not be able to use the 47 speaker in an AC chassis as the K-13 field coil is only 70 ohms.)
Why not find and restore a 71 chassis and K-7 speaker (assuming it is a cathedral) instead if you want to be able to plug it in the wall? Restoring a 71 would be less hassle. You could then sell the 47 chassis and speaker to someone who would prefer to keep it original. (You will not be able to use the 47 speaker in an AC chassis as the K-13 field coil is only 70 ohms.)
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Ron Ramirez
Ferdinand IN
