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Both tubes are 16wp4 and I have tried the ion trap. The tube checked funny with the ion trap on so removed it and then it check ok. My checker said some old tube would check different unless the ion trap was removed. I will take a closer look at the socket connections but they seemed to be ok and the pin layout seems to be the same and as both tubes have the same tube number. One reading for leakage on my checker (the 'A') setting said it should be over 4meg and was only 3.5meg but doesn't seem like that is enough difference and the checker could be off some as is old.
John
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