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That 6BK4 in your picture is an earlier version, a 'fat base' tube same as the one in my CT-100 and 21-CT-55. I had no idea they were made that long, I always assumed tubes with big bases were an early thing. The Sylvania Saratoga I picked up has a Rauland brand damper tube with a fat base, and it's an early one. Never seen one from '57.
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Evolution...
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