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Old 12-09-2007, 01:01 AM
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Tubejunke Tubejunke is offline
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It looks quite a bit bigger than a 19" to me. There were some large round tubes made, mostly used by DuMont. The 19AP4 does seem to get a bad rap. I wonder if other metal/glass crts are as troublesome. The issue is vacuum loss at the seam. If that were the case they all would be trouble.

I wonder why they ever made the metal tubes.
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