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If you have any that are NOT Philco tubes, the value should be much higher. The Philco-built SF17/17DRP4 was a terrible tube, and had a very bizarre sideways-mounted cathode in the gun. Sylvania made a 2.68v replacement which is much better, and even a cheapie rebuilt with a non-Philco gun would be a better bet...
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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