Re: 453 Nuvistor, 453 JFET, 453A JFET


John
 

The 454 was not re-engineered prior to the 454A. I would conjecture that the decision was based on the volume of sales: the 453 must have been a really good seller, and the move to FET's was accompanied by a whole host of other electro-mechanical changes which would have involved some re-tooling as well as new pcb's.

I think the 453 was introduced in the last quarter of 1965, and some time prior to 1968 the FET version was introduced. It may have been as early as Q4 1966 ??

John

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