Quote:
Originally Posted by jr_tech
What am I missing here? the Motorola Vt71 (which uses a 7JP4) was likely introduced in 1948 (Sams set 55 folder 16... 2/49)
jr
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Good point. This is the date that is listed in Tube Lore. The dates Ludwell gives are supposed to be the dates the numbers were registered with the RMA. I don't think they would have commercially produced the tube before registering it, so perhaps this is a typo?
Darryl