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An ECG-508 is a 3A3 replacement, but should work fine in there. Only thing is, it might cause more high voltage since a silicon diode is more efficient than the tube. When you convert a B+ supply from a 5U4 to a solid state bridge rectifier, you have to change the value of the main B+ resistor(s), and preferably install a delayed startup relay to allow the other tubes to warm up before giving B+. If not, there's an unloaded surge that can blast the capacitors. That should not be a problem here with the stick diode in the Predicta because the flyback will still run up slowly with the horizontal oscillator. But you probably will have a couple KV extra HV.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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