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Thanks for the post. The diagram you have does not seem to be the model I have. The radio is a 1937-38 vintage and would have 2 2×3 tubes
and the newer spray tubes. In the circuit there is a regulator tube model number is 14156. It is also used in the 12-96 model. This model is
close but not the same as the 12-91 I have and connot seem to find this diagram anywhere. .


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