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In Reply to: RE: National 5ar4 ,,, is it a Bendix? posted by Jim McShane on October 13, 2015 at 15:47:44
I've never seen one of those. Vertically stacked plates (instead of side-by-side), like an overgrown 6CA4/EZ81.
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They were built to withstand G forces far beyond "normal" and to be VERY high reliability. They were designed for missiles, aircraft, etc., and were designed to operate up to 80,000 foot altitudes.
They were WAY overbuilt as compared to a conventional 5Y3GT, but that was for improved reliability - NOT to be subbed for a 5AR4. If the circuit using the 5AR4 has moderate current draw the tube may work well, but it's not going to survive in a circuit with larger current demands. It's a shame to think of the number of these incredible tubes that have been destroyed by relabelers saying they can sub for 5AR4s!!
I had some of those and they were mislabeled 6106's.
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