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I could be wrong but I do not think the RETMA numbered rectifier tubes were available or in common use when this radio was built (around 1930) it would have used a type 80. The 80 is equivilent to a 5y3 not the 5u4/5z3 tubes. If that is a 5u4GB in the I would not use it. The 80 has a 2 amp filament whereas the 5u4 has a 3 amp filament.
I would cough up a few dollars to put the correct 80 back in there if you plan on using else the tranny might run hot and be damaged. (if there is a 5u4 in the there).
Steve
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looking for technics turntables to gramophones.
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