[BC] In search of Harris SX1

[cldube]

I appreciate all of the comments in response to my thoughts on the SX 
series.
I knew that the transistor was an IRF350, but was under the impression that
it was a hybrid version and that a stock IRF350 would not be suitable. Maybe 
I was misinformed.

My observation regarding the annual transistor "pop" was reinforced for me 
at the time by
friends and aquaintences having similar experiences.

I'm less cynical now than I was this morning.

Thanks.

Chuck

Message: 27
From: dynotherm at earthlink.net

Chuck,

Basically you are correct. Harris has always recommended pair replacement,
but working with 5's I have found this results in pulling a lot of good
transistors in boxes with low dissipation. The theory is that if you
blow one transistor all four in the quad should be changed as a precaution.

If the other problems - matching, overmodulation etc. - are solved when
the dissipation is nicely in the safe range AND installation is correct,
the failure rate goes down.

Phil Alexander, CSRE, AMD

-----Original Message-----
>From: cldube <cld at admin.umass.edu>
>
>My experience with the SX series is not if you'll need to replace
>transistors, but when.