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 Post subject: IF transformers
PostPosted: Oct Mon 01, 2018 5:14 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8185
Location: Beaver Falls, PA. USA
In radios from the late 1930s and 1940s, it is not uncommon to find that the pigtail leads of the IF transformers are covered with natural rubber. After 70-80 years, this is usually brittle and cracked, which can cause hard-to-locate shorts. The wires are not hard to replace, after the transformer is removed. Some manufacturers, notably Midwest, put bypass capacitors and decoupling resistors inside the cans, and "tweet" filter networks as well; they should also be checked and replaced it necessary. Before doing any repairs, make sure that the coils have continuity, as they do open up occasionally.


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