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The Zenith Royal Transoceanic 1000 and 3000 series radios use several types of transistors that have 4 leads. Through the years, these transistors, because of chemical and mechanical structure, have grown internal "whiskers" that short out the transistor. As Transoceanic radios age, this is becoming the most common failure mode. Click here to download a study done in 2005 by the NASA Electronic Parts and Packaging Program regarding this problem.

Because of the difficulty in finding working OEM transistors, I no longer service the Transoceanic radios. There are a number of "after-market" and Russian NOS transistors that I have tried as subs, but they do not perform as well as the originals. If you are in market to purchase a Zenith Transoceanic radio, I highly recommend purchasing a 7000 series radio. These Transoceanics use newer silicon transistors and are much more reliable players.