Age of early CRTs

[tubesrule]

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

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

[ChuckA]

It could be a typo as the 7GP4, the predecessor of the 7JP4, is listed as April 15, 1946.

Chuck