2 Working Karas Harmonik Audio Frequency Amplifying Interstage Transformers
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2 Working Karas Harmonik Audio Frequency Amplifying Interstage Transformers:
For sale is a pair of working Karas Harmonik All Stage Ratio audio frequency transformers. They were designed and manufactured by Karas Electric Co., 4043 N. Rockwell St., Chicago. These cost $5.75 each in 1925's dollars at one dealer in Chicago.Both transformers have good windings and are in good cosmetic condition. They are tested with an HP sinewave generator and a Fluke scopemeter. The black paint on both is original. One transformer has a missing thumb nut. The primary to secondary ratio was not specified but it is measured to be 1 to 4.Measurements for Transformer 1
Primary DC Resistance: 1.534 kohms
Secondary DC Resistance: 8.92 kohms
Amplification Factor: 4 at 1 kHzMeasurements for Transformer 2
Primary DC Resistance: 1.316 kohms
Secondary DC Resistance: 7.90 kohms
Amplification Factor: 4.06 at 1 kHzInternational buyers are welcome. Payment is requested within two days of purchase.