[Ron Ramirez]

Bingo, that's what I needed to know.

Part No. 4234 is the power transformer used in Model 20. Model 70 used Part No. 5117.

Part 4234 is incorrect for Model 70 as it has an extra 5 volt winding designed to run two Type 71A tubes, in addition to a 2.5V winding, a 5V winding for the 80 rectifier filament, and a high voltage winding.

Model 70 requires a high voltage winding, two 2.5V filament windings (one for the Type 47 output tube and the other for the rest of the tube filaments except the rectifier), and one 5V winding for the 80 rectifier filament.

Are you sure your set is a Model 70? Could it be a Model 20 chassis in a 21 cabinet?

Photos would be a big help here, if you can share any.