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Isn't the most up-to-date round tube the 21GVP22? (there is also one designated as 19V...something, from when the viewable image area began to be used in the designation). My RCA service manual lists all of the different round types, with their properties and necessary changes to make for upgrades, through the 21GVP22. It is listed as having a rare-earth red phosphor with unity current ratios. I had one in a set I just bought, but it was arcing, so could not determine how it looked (this 21GVP22 was a replacement made in 1969). The date code is listed on the label for the tubes I have.
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05-21-2003, 06:22 AM
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