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Yes, I have tried using a V62 on late 40s - early 50s and found the results to be very inconsistent. I went through a dozen that were all used but worked fine in a set and got a lot of bad ring tests.
I had more luck with an EICO 944 which is much earlier than a VA62.
My conclusion was that the best tests for early flybacks is if the DC resistance matches the schematic, try it in a set.
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