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Of the 18 or so tubes I had for this radio, I had them all tested.

The ones I got back as bad (he said leaking, shorted or one was so weak it was barely working)

2x6au6
2x6ea8
1x6bq5

I have enough "good tubes" to stock the radio back up, except I need to order 1x6ea8.

The two V12 (12AT7) tubes I had in the lot tested excellent, as did V13 (12BH7).

How likely is it that my hum was being caused by a 6au6 or 6ea8?

[QUOTE="479tx, post: 335361, member: 22199"] Of the 18 or so tubes I had for this radio, I had them all tested. The ones I got back as bad (he said leaking, shorted or one was so weak it was barely working) 2x6au6 2x6ea8 1x6bq5 I have enough "good tubes" to stock the radio back up, except I need to order 1x6ea8. The two V12 (12AT7) tubes I had in the lot tested excellent, as did V13 (12BH7). How likely is it that my hum was being caused by a 6au6 or 6ea8? [/QUOTE]

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