American Radio/Standard Wave King IF Xformers

American Radio IF Transformers

     I don’t know very much about the history of these transformers. What little information I do have comes from Richard T. Ammon’s preliminary book, The Rolls Royce of Reception. The company started out as the American Radio Manufacturing Company in 1925 but changed their name to the Standard Wave King in 1926. Advertisements show that the IF frequency was 45 KC. However, my measurments of the IF frequency indicate a peak frequency of about 145 KC. There is no manufacturers name on my transformers, so I don’t know for certain that my set of transformers were manufactured by American Radio.

Type

Peak Freq.

Lower 3 dB

Upper 3 dB

Bandwidth

Relative gain

Pri. ohms

Sec. ohms

#1

138.8 KC

126.3 KC

152.1 KC

25.8 KC

11.6

29.2

39.0

#2

144.5 KC

131.5 KC

158.1 KC

26.6 KC

10.8

29.8

38.9

#3

145.3 KC

129.6 KC

160.9 KC

31.3 KC

12.0

30.4

38.4

#4

143.8 KC

129.2 KC

159.2 KC

30.0 KC

11.8

29.9

38.8

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