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RE: Mullard CV4004 or Mullard ECC83?

Here's the link to the eBay Brimar 12BH7s, and the seller says he will match into pairs, so I wonder about those vs. RCA black plates. For any of these like the square getter Mullard 12AX7s on eBay, I'm clueless on how to read those test stats to determine tube condition, and could use some pointers.

- thanks in advance!


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