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There are a few more; electrostatic tubes like the 7JP4, 8BP4, 10HP4, etc.
The Philco 1207/1208 uses a 12WP4 thin neck triode. Converting the Philco is a little tricky so more have been scrapped than converted to conventional 12 inch.
TVs using triode CRTs were soon phased out in favor of the brighter and crisper pictures produced on tubes with a screen element. Power supply advancements also helped, providing more sources for screen voltage. TVs using RF power supplies or low B+ voltages didn't have a convenient 350 volt source.
Don
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12-27-2008, 12:52 PM
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