cd2664 vs cd2664A

[Multi-Volti Devices]

If one has a bolt (stud) , and one doesn't, and MRF455A has a bolt (stud),
and MRF455 doesn't, I'd draw the conclusion that the 'A' suffix doesn't
indicate a later version, but a different package. Unles you can figure out
a way to properly heatsink the CD2664's , I would not operate them, or they
will overheat and fail.

murray

-----Original Message-----
From: Valdemar Phoenix <vphoenix at MINDSPRING.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Saturday, February 27, 1999 8:02 PM
Subject: cd2664 vs cd2664A


>Hello Gang,
>
>About a month or more ago, I put out a call for 4 power transistors,
>CD2664A. I bought four CD2664 (minus the "A") from one of our fellow
>heathkitters. I recently pulled them out to get the repair project going,
>(Power amp board, HW 104) and discovered that they were a bit structurally
>different. Namely, the "A" type has a center bolt post coming out of the
>back of the metal casing, while the non "A" type does not. I assume the
>bolt is there as a heat sink, since they are not attached to anything. They
>extend through holes in the actual heat sink of the circuit board.
>
>Now my question. Are these two types electrically the same? I have tried
>tracking down the answer to this on the net unsuccessfully, and I hope
>someone here might know the answer. I would assume that the "A" version is
>simply a later version of the non A, and if so, I should be able to plop
>them in. But before I do, I want a little more info. After all, everyone on
>the list knows that these old components are getting harder and harder to
>find, and I don't want to blow them (or any thing else on the board.)  ;-)
>Thanks and 73.
>Val KG2PM
>
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