Check the listing for details. (2) Thordarson Amplifying Transformers Open Winding Radio/Audio (1920's). Condition: Used. Listed at 34.99 USD. Offered are (2) THORDARSON Amplifying Transformers, designed for audio circuits in early TRF Radios of the 1920's. These two have an open primary winding. The transformers are clean and in good condition otherwise. The second transformer has some rust on the binding posts. Original knurrled wiring nuts remain in place. The secondary winding measures 1.867K and 1.779K ohms on the DMM. Dimensions: 2 3/8 X 1 11/15 X 2 1/2 inches tall. Mounting holes are on the bottom with centers at 2 5/8 inches. Pick up the early transformers for your own restoration work or for your collection. These may be repairable. Offered for parts or restoration and "as is" due to age. No returns on these transformers, people. NO RESERVE!! Thanks for looking.