Even though I've not actually used these tubes yet I have complete faith that they will work fine. It appears the box's are virgin (i.e. never opened) I thought that I would purchase this particular tube because there are two in each R-390A/URR receiver, and I have two at the present time. I'm in the process of refurbishing one.
Verified purchase: Yes
High quality tube with specified transconductance.
Verified purchase: Yes
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