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I have a similar Zenith where the FM band slowly lost sensitivity and started drifting. I found one section of the 19T8 to be just a little weak, and once replaced the FM was rock solid again.
After that, I puled the 19T8 from my H845 and checked it, and found one section far weaker than the other 2. I always thought the H845 performed well, but a replacement tube gave me a noticeable sensitivity improvement. Evidently, those Zenith's require a good, strong 19T8 to perform properly.
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