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Thordarson Sound Amplifier Guide No. 346-B OEM 1937

Transformers by Thordarson Catalog No. 400GX OEM 1947

Tru-Fidelity by Thordarson Catalog No. 500-F Broadcast Transformers OEM 1941

Thordarson Radio Servicing Guide No. 342-B OEM Excellent Condition

Thordarson Transformer Manual Reprint 2000 Vintage Electronics Guide Book

Thordarson Complete Transformer Catalog No. 400-CX-1939 Spring Summer

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