A rectangular black metal housing enclosing a transformer, two contacts either side. Nameplate reads: “Type R-14 Ratio 3 to 1 / All-America / Trade Mark / Audio Frequency Transformer/ Guarantee No.
Remember Kenneth Lundgren’s unidentified audio transformer, discussed earlier and pictured here? There was no identification marking, so Kenneth invited thoughts from our readers about the type of ...
All-American Radio Corporation type R-15 AF transformer in original box. Marked: "Type R-15 Ratio 5 to 1 / All-American / Audio Frequency Transformer / Guarantee No. 103475 / All-American Radio Corp. ...
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